mirror of https://git.ffmpeg.org/ffmpeg.git
1347 lines
55 KiB
Plaintext
1347 lines
55 KiB
Plaintext
\input texinfo @c -*- texinfo -*-
|
|
|
|
@settitle General Documentation
|
|
@titlepage
|
|
@sp 7
|
|
@center @titlefont{General Documentation}
|
|
@sp 3
|
|
@end titlepage
|
|
|
|
|
|
@chapter external libraries
|
|
|
|
FFmpeg can be hooked up with a number of external libraries to add support
|
|
for more formats. None of them are used by default, their use has to be
|
|
explicitly requested by passing the appropriate flags to @file{./configure}.
|
|
|
|
@section AMR
|
|
|
|
AMR comes in two different flavors, wideband and narrowband. FFmpeg can make
|
|
use of the AMR wideband (floating-point mode) and the AMR narrowband
|
|
(floating-point mode) reference decoders and encoders.
|
|
|
|
Go to @url{http://www.penguin.cz/~utx/amr} and follow the instructions for
|
|
installing the libraries. Then pass @code{--enable-libamr-nb} and/or
|
|
@code{--enable-libamr-wb} to configure to enable the libraries.
|
|
|
|
Note that libamr is copyrighted without any sort of license grant. This means
|
|
that you can use it if you legally obtained it but you are not allowed to
|
|
redistribute it in any way. @strong{Any FFmpeg binaries with libamr support
|
|
you create are non-free and unredistributable!}
|
|
|
|
|
|
@chapter Supported File Formats and Codecs
|
|
|
|
You can use the @code{-formats} option to have an exhaustive list.
|
|
|
|
@section File Formats
|
|
|
|
FFmpeg supports the following file formats through the @code{libavformat}
|
|
library:
|
|
|
|
@multitable @columnfractions .4 .1 .1 .4
|
|
@item Name @tab Encoding @tab Decoding @tab Comments
|
|
@item 4xm @tab @tab X
|
|
@tab 4X Technologies format, used in some games.
|
|
@item Audio IFF (AIFF) @tab X @tab X
|
|
@item American Laser Games MM @tab @tab X
|
|
@tab Multimedia format used in games like Mad Dog McCree.
|
|
@item 3GPP AMR @tab X @tab X
|
|
@item ASF @tab X @tab X
|
|
@item AVI @tab X @tab X
|
|
@item AVISynth @tab @tab X
|
|
@item AVS @tab @tab X
|
|
@tab Multimedia format used by the Creature Shock game.
|
|
@item Beam Software SIFF @tab @tab X
|
|
@tab Audio and video format used in some games by Beam Software.
|
|
@item Bethesda Softworks VID @tab @tab X
|
|
@tab Used in some games from Bethesda Softworks.
|
|
@item Brute Force & Ignorance @tab @tab X
|
|
@tab Used in the game Flash Traffic: City of Angels.
|
|
@item Interplay C93 @tab @tab X
|
|
@tab Used in the game Cyberia from Interplay.
|
|
@item Delphine Software International CIN @tab @tab X
|
|
@tab Multimedia format used by Delphine Software games.
|
|
@item CRC testing format @tab X @tab
|
|
@item Creative Voice @tab X @tab X
|
|
@tab Created for the Sound Blaster Pro.
|
|
@item CRYO APC @tab @tab X
|
|
@tab Audio format used in some games by CRYO Interactive Entertainment.
|
|
@item D-Cinema audio @tab X @tab X
|
|
@item DV video @tab X @tab X
|
|
@item DXA @tab @tab X
|
|
@tab This format is used in the non-Windows version of the Feeble Files
|
|
game and different game cutscenes repacked for use with ScummVM.
|
|
@item Electronic Arts cdata @tab @tab X
|
|
@item Electronic Arts Multimedia @tab @tab X
|
|
@tab Used in various EA games; files have extensions like WVE and UV2.
|
|
@item FFM (FFserver live feed) @tab X @tab X
|
|
@item Flash (SWF) @tab X @tab X
|
|
@item Flash 9 (AVM2) @tab X @tab X
|
|
@tab Only embedded audio is decoded.
|
|
@item FLI/FLC/FLX animation @tab @tab X
|
|
@tab .fli/.flc files
|
|
@item Flash Video (FLV) @tab @tab X
|
|
@tab Macromedia Flash video files
|
|
@item framecrc testing format @tab X @tab
|
|
@item FunCom ISS @tab @tab X
|
|
@tab Audio format used in various games from FunCom like The Longest Journey.
|
|
@item GIF Animation @tab X @tab
|
|
@item GXF @tab X @tab X
|
|
@tab General eXchange Format SMPTE 360M, used by Thomson Grass Valley
|
|
playout servers.
|
|
@item id Quake II CIN video @tab @tab X
|
|
@item id RoQ @tab X @tab X
|
|
@tab Used in Quake III, Jedi Knight 2, other computer games.
|
|
@item IFF @tab @tab X
|
|
@tab Interchange File Format
|
|
@item Interplay MVE @tab @tab X
|
|
@tab Format used in various Interplay computer games.
|
|
@item LMLM4 @tab @tab X
|
|
@tab Used by Linux Media Labs MPEG-4 PCI boards
|
|
@item Matroska @tab X @tab X
|
|
@item Matroska audio @tab X @tab
|
|
@item MAXIS XA @tab @tab X
|
|
@tab Used in Sim City 3000; file extension .xa.
|
|
@item Monkey's Audio @tab @tab X
|
|
@item Motion Pixels MVI @tab @tab X
|
|
@item MOV/QuickTime/MP4 @tab X @tab X
|
|
@tab 3GP, 3GP2, PSP, iPod variants supported
|
|
@item MP2 @tab X @tab X
|
|
@item MP3 @tab X @tab X
|
|
@item MPEG-1 System @tab X @tab X
|
|
@tab muxed audio and video, VCD format supported
|
|
@item MPEG-PS (program stream) @tab X @tab X
|
|
@tab also known as @code{VOB} file, SVCD and DVD format supported
|
|
@item MPEG-TS (transport stream) @tab X @tab X
|
|
@tab also known as DVB Transport Stream
|
|
@item MPEG-4 @tab X @tab X
|
|
@tab MPEG-4 is a variant of QuickTime.
|
|
@item MIME multipart JPEG @tab X @tab
|
|
@item MSN TCP webcam @tab @tab X
|
|
@tab Used by MSN Messenger webcam streams.
|
|
@item MTV @tab @tab X
|
|
@item Musepack @tab @tab X
|
|
@item Musepack SV8 @tab @tab X
|
|
@item Material eXchange Format (MXF) @tab X @tab X
|
|
@tab SMPTE 377M, used by D-Cinema, broadcast industry.
|
|
@item Material eXchange Format (MXF), D-10 Mapping @tab X @tab X
|
|
@tab SMPTE 386M, D-10/IMX Mapping.
|
|
@item NC camera feed @tab @tab X
|
|
@tab NC (AVIP NC4600) camera streams
|
|
@item NTT TwinVQ (VQF) @tab @tab X
|
|
@tab Nippon Telegraph and Telephone Corporation TwinVQ.
|
|
@item Nullsoft Streaming Video @tab @tab X
|
|
@item NuppelVideo @tab @tab X
|
|
@item NUT @tab X @tab X
|
|
@tab NUT Open Container Format
|
|
@item Ogg @tab X @tab X
|
|
@item TechnoTrend PVA @tab @tab X
|
|
@tab Used by TechnoTrend DVB PCI boards.
|
|
@item raw ADTS (AAC) @tab X @tab X
|
|
@item raw AC-3 @tab X @tab X
|
|
@item raw Chinese AVS video @tab @tab X
|
|
@item raw CRI ADX @tab X @tab X
|
|
@item raw Dirac @tab X @tab X
|
|
@item raw DNxHD @tab X @tab X
|
|
@item raw DTS @tab X @tab X
|
|
@item raw E-AC-3 @tab X @tab X
|
|
@item raw FLAC @tab X @tab X
|
|
@item raw GSM @tab @tab X
|
|
@item raw H.261 @tab X @tab X
|
|
@item raw H.263 @tab X @tab X
|
|
@item raw H.264 @tab X @tab X
|
|
@item raw Ingenient MJPEG @tab @tab X
|
|
@item raw MJPEG @tab X @tab X
|
|
@item raw MLP @tab @tab X
|
|
@item raw MPEG @tab @tab X
|
|
@item raw MPEG-1 @tab @tab X
|
|
@item raw MPEG-2 @tab @tab X
|
|
@item raw MPEG-4 @tab X @tab X
|
|
@item raw NULL @tab X @tab
|
|
@item raw video @tab X @tab X
|
|
@item raw id RoQ @tab X @tab
|
|
@item raw Shorten @tab @tab X
|
|
@item raw VC-1 @tab @tab X
|
|
@item raw PCM A-law @tab X @tab X
|
|
@item raw PCM mu-law @tab X @tab X
|
|
@item raw PCM signed 8 bit @tab X @tab X
|
|
@item raw PCM signed 16 bit big-endian @tab X @tab X
|
|
@item raw PCM signed 16 bit little-endian @tab X @tab X
|
|
@item raw PCM signed 24 bit big-endian @tab X @tab X
|
|
@item raw PCM signed 24 bit little-endian @tab X @tab X
|
|
@item raw PCM signed 32 bit big-endian @tab X @tab X
|
|
@item raw PCM signed 32 bit little-endian @tab X @tab X
|
|
@item raw PCM unsigned 8 bit @tab X @tab X
|
|
@item raw PCM unsigned 16 bit big-endian @tab X @tab X
|
|
@item raw PCM unsigned 16 bit little-endian @tab X @tab X
|
|
@item raw PCM unsigned 24 bit big-endian @tab X @tab X
|
|
@item raw PCM unsigned 24 bit little-endian @tab X @tab X
|
|
@item raw PCM unsigned 32 bit big-endian @tab X @tab X
|
|
@item raw PCM unsigned 32 bit little-endian @tab X @tab X
|
|
@item raw PCM floating-point 32 bit big-endian @tab X @tab X
|
|
@item raw PCM floating-point 32 bit little-endian @tab X @tab X
|
|
@item raw PCM floating-point 64 bit big-endian @tab X @tab X
|
|
@item raw PCM floating-point 64 bit little-endian @tab X @tab X
|
|
@item RDT @tab @tab X
|
|
@item REDCODE R3D @tab @tab X
|
|
@tab File format used by RED Digital cameras, contains JPEG 2000 frames and PCM audio.
|
|
@item RealMedia @tab X @tab X
|
|
@item Redirector @tab @tab X
|
|
@item Renderware TeXture Dictionary @tab @tab X
|
|
@item RL2 @tab @tab X
|
|
@tab Audio and video format used in some games by Entertainment Software Partners.
|
|
@item RPL/ARMovie @tab @tab X
|
|
@item RTP @tab @tab X
|
|
@item RTSP @tab @tab X
|
|
@item SDP @tab @tab X
|
|
@item Sega FILM/CPK @tab @tab X
|
|
@tab Used in many Sega Saturn console games.
|
|
@item Sierra SOL @tab @tab X
|
|
@tab .sol files used in Sierra Online games.
|
|
@item Sierra VMD @tab @tab X
|
|
@tab Used in Sierra CD-ROM games.
|
|
@item Smacker @tab @tab X
|
|
@tab Multimedia format used by many games.
|
|
@item Sony OpenMG (OMA) @tab @tab X
|
|
@tab Audio format used in Sony Sonic Stage and Sony Vegas.
|
|
@item Sony PlayStation STR @tab @tab X
|
|
@item SUN AU format @tab X @tab X
|
|
@item THP @tab @tab X
|
|
@tab Used on the Nintendo GameCube.
|
|
@item Tiertex Limited SEQ @tab @tab X
|
|
@tab Tiertex .seq files used in the DOS CD-ROM version of the game Flashback.
|
|
@item True Audio @tab @tab X
|
|
@item VC-1 test bitstream @tab X @tab X
|
|
@item WAV @tab X @tab X
|
|
@item WavPack @tab @tab X
|
|
@item Wing Commander III movie @tab @tab X
|
|
@tab Multimedia format used in Origin's Wing Commander III computer game.
|
|
@item Westwood Studios audio @tab @tab X
|
|
@tab Multimedia format used in Westwood Studios games.
|
|
@item Westwood Studios VQA @tab @tab X
|
|
@tab Multimedia format used in Westwood Studios games.
|
|
@item YUV4MPEG pipe @tab X @tab X
|
|
@end multitable
|
|
|
|
@code{X} means that encoding (resp. decoding) is supported.
|
|
|
|
@section Image Formats
|
|
|
|
FFmpeg can read and write images for each frame of a video sequence. The
|
|
following image formats are supported:
|
|
|
|
@multitable @columnfractions .4 .1 .1 .4
|
|
@item Name @tab Encoding @tab Decoding @tab Comments
|
|
@item .Y.U.V @tab X @tab X
|
|
@tab one raw file per component
|
|
@item animated GIF @tab X @tab X
|
|
@tab Only uncompressed GIFs are generated.
|
|
@item BMP @tab X @tab X
|
|
@tab Microsoft BMP image
|
|
@item JPEG @tab X @tab X
|
|
@tab Progressive JPEG is not supported.
|
|
@item JPEG 2000 @tab @tab E
|
|
@tab decoding supported through external library libopenjpeg
|
|
@item JPEG-LS @tab X @tab X
|
|
@item LJPEG @tab X @tab
|
|
@tab Lossless JPEG
|
|
@item PAM @tab X @tab X
|
|
@tab PAM is a PNM extension with alpha support.
|
|
@item PBM @tab X @tab X
|
|
@tab Portable BitMap image
|
|
@item PCX @tab @tab X
|
|
@tab PC Paintbrush
|
|
@item PGM @tab X @tab X
|
|
@tab Portable GrayMap image
|
|
@item PGMYUV @tab X @tab X
|
|
@tab PGM with U and V components in YUV 4:2:0
|
|
@item PNG @tab X @tab X
|
|
@tab 2/4 bpp not supported yet
|
|
@item PPM @tab X @tab X
|
|
@tab Portable PixelMap image
|
|
@item PTX @tab @tab X
|
|
@tab V.Flash PTX format
|
|
@item SGI @tab X @tab X
|
|
@tab SGI RGB image format
|
|
@item Sun Rasterfile @tab @tab X
|
|
@tab Sun RAS image format
|
|
@item TIFF @tab X @tab X
|
|
@tab YUV, JPEG and some extension is not supported yet.
|
|
@item Truevision Targa @tab X @tab X
|
|
@tab Targa (.TGA) image format
|
|
@end multitable
|
|
|
|
@code{X} means that encoding (resp. decoding) is supported.
|
|
|
|
@code{E} means that support is provided through an external library.
|
|
|
|
@section Video Codecs
|
|
|
|
@multitable @columnfractions .4 .1 .1 .4
|
|
@item Name @tab Encoding @tab Decoding @tab Comments
|
|
@item 4X Movie @tab @tab X
|
|
@tab Used in certain computer games.
|
|
@item 8SVX exponential @tab @tab X
|
|
@item 8SVX fibonacci @tab @tab X
|
|
@item American Laser Games MM @tab @tab X
|
|
@tab Used in games like Mad Dog McCree.
|
|
@item AMV Video @tab @tab X
|
|
@tab Used in Chinese MP3 players.
|
|
@item Apple MJPEG-B @tab @tab X
|
|
@item Apple QuickDraw @tab @tab X
|
|
@tab fourcc: qdrw
|
|
@item Asus v1 @tab X @tab X
|
|
@tab fourcc: ASV1
|
|
@item Asus v2 @tab X @tab X
|
|
@tab fourcc: ASV2
|
|
@item ATI VCR1 @tab @tab X
|
|
@tab fourcc: VCR1
|
|
@item ATI VCR2 @tab @tab X
|
|
@tab fourcc: VCR2
|
|
@item Autodesk Animator Flic video @tab @tab X
|
|
@item Autodesk RLE @tab @tab X
|
|
@tab fourcc: AASC
|
|
@item AVS (Audio Video Standard) video @tab @tab X
|
|
@tab Video encoding used by the Creature Shock game.
|
|
@item Beam Software VB @tab @tab X
|
|
@item Bethesda VID video @tab @tab X
|
|
@tab Used in some games from Bethesda Softworks.
|
|
@item Brute Force & Ignorance @tab @tab X
|
|
@tab Used in the game Flash Traffic: City of Angels.
|
|
@item C93 video @tab @tab X
|
|
@tab Codec used in Cyberia game.
|
|
@item CamStudio @tab @tab X
|
|
@tab fourcc: CSCD
|
|
@item Chinese AVS video @tab @tab X
|
|
@tab AVS1-P2, JiZhun profile
|
|
@item Delphine Software International CIN video @tab @tab X
|
|
@tab Codec used in Delphine Software International games.
|
|
@item Cinepak @tab @tab X
|
|
@item Cirrus Logic AccuPak @tab @tab X
|
|
@tab fourcc: CLJR
|
|
@item Creative YUV (CYUV) @tab @tab X
|
|
@item Dirac @tab E @tab E
|
|
@tab supported through external libdirac/libschroedinger libraries
|
|
@item DNxHD @tab X @tab X
|
|
@tab aka SMPTE VC3
|
|
@item Duck TrueMotion 1.0 @tab @tab X
|
|
@tab fourcc: DUCK
|
|
@item Duck TrueMotion 2.0 @tab @tab X
|
|
@tab fourcc: TM20
|
|
@item DV (Digital Video) @tab X @tab X
|
|
@item Feeble Files/ScummVM DXA @tab @tab X
|
|
@tab Codec originally used in Feeble Files game.
|
|
@item Electronic Arts CMV video @tab @tab X
|
|
@tab Used in NHL 95 game.
|
|
@item Electronic Arts TGV video @tab @tab X
|
|
@item Electronic Arts TGQ video @tab @tab X
|
|
@item Electronic Arts TQI video @tab @tab X
|
|
@item Escape 124 @tab @tab X
|
|
@item FFmpeg codec #1 @tab X @tab X
|
|
@tab experimental lossless codec (fourcc: FFV1)
|
|
@item Flash Screen Video v1 @tab X @tab X
|
|
@tab fourcc: FSV1
|
|
@item Flash Video (FLV) @tab X @tab X
|
|
@tab Sorenson H.263 used in Flash
|
|
@item Fraps @tab @tab X
|
|
@item H.261 @tab X @tab X
|
|
@item H.263 / H.263-1996 @tab X @tab X
|
|
@item H.263+ / H.263-1998 / H.263 version 2 @tab X @tab X
|
|
@item H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 @tab E @tab X
|
|
@tab encoding supported through external library libx264
|
|
@item H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (VDPAU acceleration) @tab E @tab X
|
|
@item HuffYUV @tab X @tab X
|
|
@item HuffYUV FFmpeg variant @tab X @tab X
|
|
@item IBM Ultimotion @tab @tab X
|
|
@tab fourcc: ULTI
|
|
@item id Cinematic video @tab @tab X
|
|
@tab Used in Quake II.
|
|
@item id RoQ video @tab X @tab X
|
|
@tab Used in Quake III, Jedi Knight 2, other computer games.
|
|
@item Intel H.263 @tab @tab X
|
|
@item Intel Indeo 2 @tab @tab X
|
|
@item Intel Indeo 3 @tab @tab X
|
|
@item Interplay C93 @tab @tab X
|
|
@tab Used in the game Cyberia from Interplay.
|
|
@item Interplay MVE video @tab @tab X
|
|
@tab Used in Interplay .MVE files.
|
|
@item Karl Morton's video codec @tab @tab X
|
|
@tab Codec used in Worms games.
|
|
@item LCL (LossLess Codec Library) MSZH @tab @tab X
|
|
@item LCL (LossLess Codec Library) ZLIB @tab E @tab E
|
|
@item LOCO @tab @tab X
|
|
@item lossless MJPEG @tab X @tab X
|
|
@item Microsoft RLE @tab @tab X
|
|
@item Microsoft Video 1 @tab @tab X
|
|
@item Mimic @tab @tab X
|
|
@tab Used in MSN Messenger Webcam streams.
|
|
@item Miro VideoXL @tab @tab X
|
|
@tab fourcc: VIXL
|
|
@item MJPEG (Motion JPEG) @tab X @tab X
|
|
@item Motion Pixels video @tab @tab X
|
|
@item MPEG-1 video @tab X @tab X
|
|
@item MPEG-1/2 video XvMC (X-Video Motion Compensation) @tab @tab X
|
|
@item MPEG-1/2 video (VDPAU acceleration) @tab @tab X
|
|
@item MPEG-2 video @tab X @tab X
|
|
@item MPEG-4 part 2 @tab X @tab X
|
|
@ libxvidcore can be used alternatively for encoding.
|
|
@item MPEG-4 part 2 Microsoft variant version 1 @tab X @tab X
|
|
@item MPEG-4 part 2 Microsoft variant version 2 @tab X @tab X
|
|
@item MPEG-4 part 2 Microsoft variant version 3 @tab X @tab X
|
|
@item Nintendo Gamecube THP video @tab @tab X
|
|
@item NuppelVideo/RTjpeg @tab @tab X
|
|
@tab Video encoding used in NuppelVideo files.
|
|
@item On2 VP3 @tab @tab X
|
|
@tab still experimental
|
|
@item On2 VP5 @tab @tab X
|
|
@tab fourcc: VP50
|
|
@item On2 VP6 @tab @tab X
|
|
@tab fourcc: VP60,VP61,VP62
|
|
@item planar RGB @tab @tab X
|
|
@tab fourcc: 8BPS
|
|
@item Q-team QPEG @tab @tab X
|
|
@tab fourccs: QPEG, Q1.0, Q1.1
|
|
@item QuickTime 8BPS video @tab @tab X
|
|
@item QuickTime Animation (RLE) video @tab X @tab X
|
|
@tab fourcc: 'rle '
|
|
@item QuickTime Graphics (SMC) @tab @tab X
|
|
@tab fourcc: 'smc '
|
|
@item QuickTime video (RPZA) @tab @tab X
|
|
@tab fourcc: rpza
|
|
@item Raw Video @tab X @tab X
|
|
@item RealVideo 1.0 @tab X @tab X
|
|
@item RealVideo 2.0 @tab X @tab X
|
|
@item RealVideo 3.0 @tab @tab X
|
|
@tab still far from ideal
|
|
@item RealVideo 4.0 @tab @tab X
|
|
@item Renderware TXD (TeXture Dictionary) @tab @tab X
|
|
@tab Texture dictionaries used by the Renderware Engine.
|
|
@item RL2 video @tab @tab X
|
|
@tab used in some games by Entertainment Software Partners
|
|
@item Sierra VMD video @tab @tab X
|
|
@tab Used in Sierra VMD files.
|
|
@item Smacker video @tab @tab X
|
|
@tab Video encoding used in Smacker.
|
|
@item SMPTE VC-1 @tab @tab X
|
|
@item Snow @tab X @tab X
|
|
@tab experimental wavelet codec (fourcc: SNOW)
|
|
@item Sony PlayStation MDEC (Motion DECoder) @tab @tab X
|
|
@item Sorenson Vector Quantizer 1 @tab X @tab X
|
|
@tab fourcc: SVQ1
|
|
@item Sorenson Vector Quantizer 3 @tab @tab X
|
|
@tab fourcc: SVQ3
|
|
@item Sunplus JPEG (SP5X) @tab @tab X
|
|
@tab fourcc: SP5X
|
|
@item TechSmith Screen Capture Codec @tab @tab X
|
|
@tab fourcc: TSCC
|
|
@item Theora @tab E @tab X
|
|
@tab encoding supported through external library libtheora
|
|
@item Tiertex Limited SEQ video @tab @tab X
|
|
@tab Codec used in DOS CD-ROM FlashBack game.
|
|
@item VMware Screen Codec / VMware Video @tab @tab X
|
|
@tab Codec used in videos captured by VMware.
|
|
@item Westwood Studios VQA (Vector Quantized Animation) video @tab @tab X
|
|
@item Windows Media Video 7 @tab X @tab X
|
|
@item Windows Media Video 8 @tab X @tab X
|
|
@item Windows Media Video 9 @tab @tab X
|
|
@tab not completely working
|
|
@item Wing Commander III / Xan @tab @tab X
|
|
@tab Used in Wing Commander III .MVE files.
|
|
@item Winnov WNV1 @tab @tab X
|
|
@item WMV7 @tab X @tab X
|
|
@item YAMAHA SMAF @tab X @tab X
|
|
@item ZLIB @tab X @tab X
|
|
@tab part of LCL, encoder experimental
|
|
@item Zip Motion Blocks Video @tab X @tab X
|
|
@tab Encoder works only in PAL8.
|
|
@end multitable
|
|
|
|
@code{X} means that encoding (resp. decoding) is supported.
|
|
|
|
@code{E} means that support is provided through an external library.
|
|
|
|
@section Audio Codecs
|
|
|
|
@multitable @columnfractions .4 .1 .1 .4
|
|
@item Name @tab Encoding @tab Decoding @tab Comments
|
|
@item 8SVX audio @tab @tab X
|
|
@item AAC @tab E @tab X
|
|
@tab encoding supported through external library libfaac
|
|
@item AC-3 @tab IX @tab X
|
|
@item ADPCM 4X Movie @tab @tab X
|
|
@item ADPCM CDROM XA @tab @tab X
|
|
@item ADPCM Creative Technology @tab @tab X
|
|
@tab 16 -> 4, 8 -> 4, 8 -> 3, 8 -> 2
|
|
@item ADPCM Electronic Arts @tab @tab X
|
|
@tab Used in various EA titles.
|
|
@item ADPCM Electronic Arts Maxis CDROM XS @tab @tab X
|
|
@tab Used in Sim City 3000.
|
|
@item ADPCM Electronic Arts R1 @tab @tab X
|
|
@item ADPCM Electronic Arts R2 @tab @tab X
|
|
@item ADPCM Electronic Arts R3 @tab @tab X
|
|
@item ADPCM Electronic Arts XAS @tab @tab X
|
|
@item ADPCM G.726 @tab X @tab X
|
|
@item ADPCM IMA AMV @tab @tab X
|
|
@tab Used in AMV files
|
|
@item ADPCM IMA Electronic Arts EACS @tab @tab X
|
|
@item ADPCM IMA Electronic Arts SEAD @tab @tab X
|
|
@item ADPCM IMA Funcom @tab @tab X
|
|
@item ADPCM IMA QuickTime @tab X @tab X
|
|
@item ADPCM IMA Loki SDL MJPEG @tab @tab X
|
|
@item ADPCM IMA WAV @tab X @tab X
|
|
@item ADPCM IMA Westwood @tab @tab X
|
|
@item ADPCM ISS IMA @tab @tab X
|
|
@tab Used in FunCom games.
|
|
@item ADPCM IMA Duck DK3 @tab @tab X
|
|
@tab Used in some Sega Saturn console games.
|
|
@item ADPCM IMA Duck DK4 @tab @tab X
|
|
@tab Used in some Sega Saturn console games.
|
|
@item ADPCM Microsoft @tab X @tab X
|
|
@item ADPCM MS IMA @tab X @tab X
|
|
@item ADPCM Nintendo Gamecube THP @tab @tab X
|
|
@item ADPCM QT IMA @tab X @tab X
|
|
@item ADPCM SEGA CRI ADX @tab X @tab X
|
|
@tab Used in Sega Dreamcast games.
|
|
@item ADPCM Shockwave Flash @tab X @tab X
|
|
@item ADPCM SMJPEG IMA @tab @tab X
|
|
@tab Used in certain Loki game ports.
|
|
@item ADPCM Sound Blaster Pro 2-bit @tab @tab X
|
|
@item ADPCM Sound Blaster Pro 2.6-bit @tab @tab X
|
|
@item ADPCM Sound Blaster Pro 4-bit @tab @tab X
|
|
@item ADPCM Westwood Studios IMA @tab @tab X
|
|
@tab Used in Westwood Studios games like Command and Conquer.
|
|
@item ADPCM Yamaha @tab X @tab X
|
|
@item AMR-NB @tab E @tab E
|
|
@tab supported through external library libamrnb
|
|
@item AMR-WB @tab E @tab E
|
|
@tab supported through external library libamrwb
|
|
@item Apple lossless audio @tab X @tab X
|
|
@tab QuickTime fourcc 'alac'
|
|
@item Atrac 3 @tab @tab X
|
|
@item Delphine Software International CIN audio @tab @tab X
|
|
@tab Codec used in Delphine Software International games.
|
|
@item COOK @tab @tab X
|
|
@tab All versions except 5.1 are supported.
|
|
@item DCA (DTS Coherent Acoustics) @tab @tab X
|
|
@item DPCM id RoQ @tab X @tab X
|
|
@tab Used in Quake III, Jedi Knight 2, other computer games.
|
|
@item DPCM Interplay @tab @tab X
|
|
@tab Used in various Interplay computer games.
|
|
@item DPCM Sierra Online @tab @tab X
|
|
@tab Used in Sierra Online game audio files.
|
|
@item DPCM Sol @tab @tab X
|
|
@item DPCM Xan @tab @tab X
|
|
@item DSP Group TrueSpeech @tab @tab X
|
|
@item DV audio @tab @tab X
|
|
@item Enhanced AC-3 @tab @tab X
|
|
@item FLAC (Free Lossless Audio Codec) @tab X @tab IX
|
|
@item G.729 @tab @tab X
|
|
@item GSM @tab E @tab E
|
|
@tab supported through external library libgsm
|
|
@item GSM Microsoft variant @tab E @tab E
|
|
@tab supported through external library libgsm
|
|
@item IMC (Intel Music Coder) @tab @tab X
|
|
@item MACE (Macintosh Audio Compression/Expansion) 3:1 @tab @tab X
|
|
@item MACE (Macintosh Audio Compression/Expansion) 6:1 @tab @tab X
|
|
@item MLP(Meridian Lossless Packing)/TrueHD @tab @tab X
|
|
@tab Used in DVD-Audio and Blu-Ray discs.
|
|
@item Monkey's Audio @tab @tab X
|
|
@tab Only versions 3.97-3.99 are supported.
|
|
@item MP1 (MPEG audio layer 1) @tab @tab IX
|
|
@item MP2 (MPEG audio layer 2) @tab IX @tab IX
|
|
@item MP3 (MPEG audio layer 3) @tab E @tab IX
|
|
@tab encoding supported through external library LAME, ADU MP3 and MP3onMP4 also supported
|
|
@item Musepack SV7 @tab @tab X
|
|
@item Musepack SV8 @tab @tab X
|
|
@item Nellymoser Asao @tab X @tab X
|
|
@item PCM A-law @tab X @tab X
|
|
@item PCM mu-law @tab X @tab X
|
|
@item PCM 16-bit little-endian planar @tab @tab X
|
|
@item PCM 32-bit floating point big-endian @tab X @tab X
|
|
@item PCM 32-bit floating point little-endian @tab X @tab X
|
|
@item PCM 64-bit floating point big-endian @tab X @tab X
|
|
@item PCM 64-bit floating point little-endian @tab X @tab X
|
|
@item PCM D-Cinema audio signed 24-bit @tab X @tab X
|
|
@item PCM signed 8-bit @tab X @tab X
|
|
@item PCM signed 16-bit big-endian @tab X @tab X
|
|
@item PCM signed 16-bit little-endian @tab X @tab X
|
|
@item PCM signed 24-bit big-endian @tab X @tab X
|
|
@item PCM signed 24-bit little-endian @tab X @tab X
|
|
@item PCM signed 32-bit big-endian @tab X @tab X
|
|
@item PCM signed 32-bit little-endian @tab X @tab X
|
|
@item PCM unsigned 8-bit @tab X @tab X
|
|
@item PCM unsigned 16-bit big-endian @tab X @tab X
|
|
@item PCM unsigned 16-bit little-endian @tab X @tab X
|
|
@item PCM unsigned 24-bit big-endian @tab X @tab X
|
|
@item PCM unsigned 24-bit little-endian @tab X @tab X
|
|
@item PCM unsigned 32-bit big-endian @tab X @tab X
|
|
@item PCM unsigned 32-bit little-endian @tab X @tab X
|
|
@item PCM Zork @tab X @tab X
|
|
@item QCELP / PureVoice @tab @tab X
|
|
@item QDesign Music Codec 2 @tab @tab X
|
|
@tab There are still some distortions.
|
|
@item RealAudio 1.0 (14.4K) @tab @tab X
|
|
@tab Real 14400 bit/s codec
|
|
@item RealAudio 2.0 (28.8K) @tab @tab X
|
|
@tab Real 28800 bit/s codec
|
|
@item RealAudio 3.0 (dnet) @tab IX @tab X
|
|
@tab Real low bitrate AC-3 codec
|
|
@item Shorten @tab @tab X
|
|
@item Sierra VMD audio @tab @tab X
|
|
@tab Used in Sierra VMD files.
|
|
@item Smacker audio @tab @tab X
|
|
@item Sonic @tab X @tab X
|
|
@tab experimental codec
|
|
@item Sonic lossless @tab X @tab X
|
|
@tab experimental codec
|
|
@item Speex @tab @tab E
|
|
@tab supported through external library libspeex
|
|
@item True Audio (TTA) @tab @tab X
|
|
@item Vorbis @tab E @tab X
|
|
@ A native but very primitive encoder exists.
|
|
@item WavPack @tab @tab X
|
|
@item Westwood Audio (SND1) @tab @tab X
|
|
@item Windows Media Audio 1 @tab X @tab X
|
|
@item Windows Media Audio 2 @tab X @tab X
|
|
@tab Used in Origin's Wing Commander IV AVI files.
|
|
@end multitable
|
|
|
|
@code{X} means that encoding (resp. decoding) is supported.
|
|
|
|
@code{E} means that support is provided through an external library.
|
|
|
|
@code{I} means that an integer-only version is available, too (ensures high
|
|
performance on systems without hardware floating point support).
|
|
|
|
@section Subtitle Formats
|
|
|
|
@multitable @columnfractions .4 .1 .1 .1 .1 .1
|
|
@item Name @tab Muxing @tab Demuxing @tab Encoding @tab Decoding
|
|
@item SSA/ASS @tab X @tab X
|
|
@item DVB @tab X @tab X @tab X @tab X
|
|
@item DVD @tab X @tab X @tab X @tab X
|
|
@item XSUB @tab @tab @tab @tab X
|
|
@end multitable
|
|
|
|
@code{X} means that the feature is supported.
|
|
|
|
@section Network Protocols
|
|
|
|
@multitable @columnfractions .4 .1 .1 .1 .1 .1
|
|
@item Name @tab Support
|
|
@item file @tab X
|
|
@item Gopher @tab X
|
|
@item HTTP @tab X
|
|
@item pipe @tab X
|
|
@item RTP @tab X
|
|
@item TCP @tab X
|
|
@item UDP @tab X
|
|
@end multitable
|
|
|
|
@code{X} means that the protocol is supported.
|
|
|
|
|
|
@chapter Platform Specific information
|
|
|
|
@section BSD
|
|
|
|
BSD make will not build FFmpeg, you need to install and use GNU Make
|
|
(@file{gmake}).
|
|
|
|
@section Windows
|
|
|
|
To get help and instructions for building FFmpeg under Windows, check out
|
|
the FFmpeg Windows Help Forum at
|
|
@url{http://ffmpeg.arrozcru.org/}.
|
|
|
|
@subsection Native Windows compilation
|
|
|
|
FFmpeg can be built to run natively on Windows using the MinGW tools. Install
|
|
the latest versions of MSYS and MinGW from @url{http://www.mingw.org/}.
|
|
You can find detailed installation
|
|
instructions in the download section and the FAQ.
|
|
|
|
FFmpeg does not build out-of-the-box with the packages the automated MinGW
|
|
installer provides. It also requires coreutils to be installed and many other
|
|
packages updated to the latest version. The minimum version for some packages
|
|
are listed below:
|
|
|
|
@itemize
|
|
@item bash 3.1
|
|
@item msys-make 3.81-2 (note: not mingw32-make)
|
|
@item w32api 3.13
|
|
@item mingw-runtime 3.15
|
|
@end itemize
|
|
|
|
You will also need to pass @code{-fno-common} to the compiler to work around
|
|
a GCC bug (see @url{http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216}).
|
|
|
|
Within the MSYS shell, configure and make with:
|
|
|
|
@example
|
|
./configure --enable-memalign-hack --extra-cflags=-fno-common
|
|
make
|
|
make install
|
|
@end example
|
|
|
|
This will install @file{ffmpeg.exe} along with many other development files
|
|
to @file{/usr/local}. You may specify another install path using the
|
|
@code{--prefix} option in @file{configure}.
|
|
|
|
Notes:
|
|
|
|
@itemize
|
|
|
|
@item In order to compile FFplay, you must have the MinGW development library
|
|
of SDL. Get it from @url{http://www.libsdl.org}.
|
|
Edit the @file{bin/sdl-config} script so that it points to the correct prefix
|
|
where SDL was installed. Verify that @file{sdl-config} can be launched from
|
|
the MSYS command line.
|
|
|
|
@item By using @code{./configure --enable-shared} when configuring FFmpeg,
|
|
you can build libavutil, libavcodec and libavformat as DLLs.
|
|
|
|
@end itemize
|
|
|
|
@subsection Microsoft Visual C++ compatibility
|
|
|
|
As stated in the FAQ, FFmpeg will not compile under MSVC++. However, if you
|
|
want to use the libav* libraries in your own applications, you can still
|
|
compile those applications using MSVC++. But the libav* libraries you link
|
|
to @emph{must} be built with MinGW. However, you will not be able to debug
|
|
inside the libav* libraries, since MSVC++ does not recognize the debug
|
|
symbols generated by GCC.
|
|
We strongly recommend you to move over from MSVC++ to MinGW tools.
|
|
|
|
This description of how to use the FFmpeg libraries with MSVC++ is based on
|
|
Microsoft Visual C++ 2005 Express Edition. If you have a different version,
|
|
you might have to modify the procedures slightly.
|
|
|
|
@subsubsection Using static libraries
|
|
|
|
Assuming you have just built and installed FFmpeg in @file{/usr/local}.
|
|
|
|
@enumerate
|
|
|
|
@item Create a new console application ("File / New / Project") and then
|
|
select "Win32 Console Application". On the appropriate page of the
|
|
Application Wizard, uncheck the "Precompiled headers" option.
|
|
|
|
@item Write the source code for your application, or, for testing, just
|
|
copy the code from an existing sample application into the source file
|
|
that MSVC++ has already created for you. For example, you can copy
|
|
@file{output_example.c} from the FFmpeg distribution.
|
|
|
|
@item Open the "Project / Properties" dialog box. In the "Configuration"
|
|
combo box, select "All Configurations" so that the changes you make will
|
|
affect both debug and release builds. In the tree view on the left hand
|
|
side, select "C/C++ / General", then edit the "Additional Include
|
|
Directories" setting to contain the path where the FFmpeg includes were
|
|
installed (i.e. @file{c:\msys\1.0\local\include}).
|
|
Do not add MinGW's include directory here, or the include files will
|
|
conflict with MSVC's.
|
|
|
|
@item Still in the "Project / Properties" dialog box, select
|
|
"Linker / General" from the tree view and edit the
|
|
"Additional Library Directories" setting to contain the @file{lib}
|
|
directory where FFmpeg was installed (i.e. @file{c:\msys\1.0\local\lib}),
|
|
the directory where MinGW libs are installed (i.e. @file{c:\mingw\lib}),
|
|
and the directory where MinGW's GCC libs are installed
|
|
(i.e. @file{C:\mingw\lib\gcc\mingw32\4.2.1-sjlj}). Then select
|
|
"Linker / Input" from the tree view, and add the files @file{libavformat.a},
|
|
@file{libavcodec.a}, @file{libavutil.a}, @file{libmingwex.a},
|
|
@file{libgcc.a}, and any other libraries you used (i.e. @file{libz.a})
|
|
to the end of "Additional Dependencies".
|
|
|
|
@item Now, select "C/C++ / Code Generation" from the tree view. Select
|
|
"Debug" in the "Configuration" combo box. Make sure that "Runtime
|
|
Library" is set to "Multi-threaded Debug DLL". Then, select "Release" in
|
|
the "Configuration" combo box and make sure that "Runtime Library" is
|
|
set to "Multi-threaded DLL".
|
|
|
|
@item Click "OK" to close the "Project / Properties" dialog box.
|
|
|
|
@item MSVC++ lacks some C99 header files that are fundamental for FFmpeg.
|
|
Get msinttypes from @url{http://code.google.com/p/msinttypes/downloads/list}
|
|
and install it in MSVC++'s include directory
|
|
(i.e. @file{C:\Program Files\Microsoft Visual Studio 8\VC\include}).
|
|
|
|
@item MSVC++ also does not understand the @code{inline} keyword used by
|
|
FFmpeg, so you must add this line before @code{#include}ing libav*:
|
|
@example
|
|
#define inline _inline
|
|
@end example
|
|
|
|
@item Build your application, everything should work.
|
|
|
|
@end enumerate
|
|
|
|
@subsubsection Using shared libraries
|
|
|
|
This is how to create DLL and LIB files that are compatible with MSVC++:
|
|
|
|
@enumerate
|
|
|
|
@item Add a call to @file{vcvars32.bat} (which sets up the environment
|
|
variables for the Visual C++ tools) as the first line of @file{msys.bat}.
|
|
The standard location for @file{vcvars32.bat} is
|
|
@file{C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat},
|
|
and the standard location for @file{msys.bat} is @file{C:\msys\1.0\msys.bat}.
|
|
If this corresponds to your setup, add the following line as the first line
|
|
of @file{msys.bat}:
|
|
|
|
@example
|
|
call "C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat"
|
|
@end example
|
|
|
|
Alternatively, you may start the @file{Visual Studio 2005 Command Prompt},
|
|
and run @file{c:\msys\1.0\msys.bat} from there.
|
|
|
|
@item Within the MSYS shell, run @code{lib.exe}. If you get a help message
|
|
from @file{Microsoft (R) Library Manager}, this means your environment
|
|
variables are set up correctly, the @file{Microsoft (R) Library Manager}
|
|
is on the path and will be used by FFmpeg to create
|
|
MSVC++-compatible import libraries.
|
|
|
|
@item Build FFmpeg with
|
|
|
|
@example
|
|
./configure --enable-shared --enable-memalign-hack
|
|
make
|
|
make install
|
|
@end example
|
|
|
|
Your install path (@file{/usr/local/} by default) should now have the
|
|
necessary DLL and LIB files under the @file{bin} directory.
|
|
|
|
@end enumerate
|
|
|
|
To use those files with MSVC++, do the same as you would do with
|
|
the static libraries, as described above. But in Step 4,
|
|
you should only need to add the directory where the LIB files are installed
|
|
(i.e. @file{c:\msys\usr\local\bin}). This is not a typo, the LIB files are
|
|
installed in the @file{bin} directory. And instead of adding @file{libxx.a}
|
|
files, you should add @file{avcodec.lib}, @file{avformat.lib}, and
|
|
@file{avutil.lib}. There should be no need for @file{libmingwex.a},
|
|
@file{libgcc.a}, and @file{wsock32.lib}, nor any other external library
|
|
statically linked into the DLLs. The @file{bin} directory contains a bunch
|
|
of DLL files, but the ones that are actually used to run your application
|
|
are the ones with a major version number in their filenames
|
|
(i.e. @file{avcodec-51.dll}).
|
|
|
|
@subsection Cross compilation for Windows with Linux
|
|
|
|
You must use the MinGW cross compilation tools available at
|
|
@url{http://www.mingw.org/}.
|
|
|
|
Then configure FFmpeg with the following options:
|
|
@example
|
|
./configure --target-os=mingw32 --cross-prefix=i386-mingw32msvc-
|
|
@end example
|
|
(you can change the cross-prefix according to the prefix chosen for the
|
|
MinGW tools).
|
|
|
|
Then you can easily test FFmpeg with Wine
|
|
(@url{http://www.winehq.com/}).
|
|
|
|
@subsection Compilation under Cygwin
|
|
|
|
The main issue with the 1.5.x Cygwin versions is that newlib, its C library,
|
|
does not contain llrint(). You need to upgrade to the unstable 1.7.x versions,
|
|
or leverage the implementation in MinGW (as explained below).
|
|
|
|
Just install your Cygwin with all the "Base" packages, plus the
|
|
following "Devel" ones:
|
|
@example
|
|
binutils, gcc-core, make, subversion, mingw-runtime, diffutils
|
|
@end example
|
|
|
|
The experimental gcc4 package is still buggy, hence please
|
|
use the official gcc 3.4.4 or a 4.2.x compiled from source by yourself.
|
|
|
|
Install the current binutils-20080624-2 as they work fine (the old
|
|
binutils-20060709-1 proved buggy on shared builds).
|
|
|
|
Then create a small library that just contains llrint():
|
|
|
|
@example
|
|
ar x /usr/lib/mingw/libmingwex.a llrint.o
|
|
ar cq /usr/local/lib/libllrint.a llrint.o
|
|
@end example
|
|
|
|
Then run
|
|
|
|
@example
|
|
./configure --enable-static --disable-shared --extra-ldflags='-L /usr/local/lib' --extra-libs='-l llrint'
|
|
@end example
|
|
|
|
to make a static build or
|
|
|
|
@example
|
|
./configure --enable-shared --disable-static --extra-ldflags='-L /usr/local/lib' --extra-libs='-l llrint'
|
|
@end example
|
|
|
|
to build shared libraries.
|
|
|
|
If you want to build FFmpeg with additional libraries, download Cygwin
|
|
"Devel" packages for Ogg and Vorbis from any Cygwin packages repository:
|
|
@example
|
|
libogg-devel, libvorbis-devel
|
|
@end example
|
|
|
|
These library packages are only available from Cygwin Ports
|
|
(@url{http://sourceware.org/cygwinports/}) :
|
|
|
|
@example
|
|
yasm, libSDL-devel, libdirac-devel, libfaac-devel, libfaad-devel, libgsm-devel,
|
|
libmp3lame-devel, libschroedinger1.0-devel, speex-devel, libtheora-devel,
|
|
libxvidcore-devel
|
|
@end example
|
|
|
|
The recommendation for libnut and x264 is to build them from source by
|
|
yourself, as they evolve too quickly for Cygwin Ports to be up to date.
|
|
|
|
Cygwin 1.7.x has IPv6 support. You can add IPv6 to Cygwin 1.5.x by means
|
|
of the @code{libgetaddrinfo-devel} package, available at Cygwin Ports.
|
|
|
|
@subsection Crosscompilation for Windows under Cygwin
|
|
|
|
With Cygwin you can create Windows binaries that do not need the cygwin1.dll.
|
|
|
|
Just install your Cygwin as explained before, plus these additional
|
|
"Devel" packages:
|
|
@example
|
|
gcc-mingw-core, mingw-runtime, mingw-zlib
|
|
@end example
|
|
|
|
and add some special flags to your configure invocation.
|
|
|
|
For a static build run
|
|
@example
|
|
./configure --target-os=mingw32 --enable-memalign-hack --enable-static --disable-shared --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin
|
|
@end example
|
|
|
|
and for a build with shared libraries
|
|
@example
|
|
./configure --target-os=mingw32 --enable-memalign-hack --enable-shared --disable-static --extra-cflags=-mno-cygwin --extra-libs=-mno-cygwin
|
|
@end example
|
|
|
|
@section BeOS
|
|
|
|
BeOS support is broken in mysterious ways.
|
|
|
|
@section OS/2
|
|
|
|
For information about compiling FFmpeg on OS/2 see
|
|
@url{http://www.edm2.com/index.php/FFmpeg}.
|
|
|
|
@chapter Developers Guide
|
|
|
|
@section API
|
|
@itemize @bullet
|
|
@item libavcodec is the library containing the codecs (both encoding and
|
|
decoding). Look at @file{libavcodec/apiexample.c} to see how to use it.
|
|
|
|
@item libavformat is the library containing the file format handling (mux and
|
|
demux code for several formats). Look at @file{ffplay.c} to use it in a
|
|
player. See @file{output_example.c} to use it to generate audio or video
|
|
streams.
|
|
|
|
@end itemize
|
|
|
|
@section Integrating libavcodec or libavformat in your program
|
|
|
|
You can integrate all the source code of the libraries to link them
|
|
statically to avoid any version problem. All you need is to provide a
|
|
'config.mak' and a 'config.h' in the parent directory. See the defines
|
|
generated by ./configure to understand what is needed.
|
|
|
|
You can use libavcodec or libavformat in your commercial program, but
|
|
@emph{any patch you make must be published}. The best way to proceed is
|
|
to send your patches to the FFmpeg mailing list.
|
|
|
|
@node Coding Rules
|
|
@section Coding Rules
|
|
|
|
FFmpeg is programmed in the ISO C90 language with a few additional
|
|
features from ISO C99, namely:
|
|
@itemize @bullet
|
|
@item
|
|
the @samp{inline} keyword;
|
|
@item
|
|
@samp{//} comments;
|
|
@item
|
|
designated struct initializers (@samp{struct s x = @{ .i = 17 @};})
|
|
@item
|
|
compound literals (@samp{x = (struct s) @{ 17, 23 @};})
|
|
@end itemize
|
|
|
|
These features are supported by all compilers we care about, so we will not
|
|
accept patches to remove their use unless they absolutely do not impair
|
|
clarity and performance.
|
|
|
|
All code must compile with GCC 2.95 and GCC 3.3. Currently, FFmpeg also
|
|
compiles with several other compilers, such as the Compaq ccc compiler
|
|
or Sun Studio 9, and we would like to keep it that way unless it would
|
|
be exceedingly involved. To ensure compatibility, please do not use any
|
|
additional C99 features or GCC extensions. Especially watch out for:
|
|
@itemize @bullet
|
|
@item
|
|
mixing statements and declarations;
|
|
@item
|
|
@samp{long long} (use @samp{int64_t} instead);
|
|
@item
|
|
@samp{__attribute__} not protected by @samp{#ifdef __GNUC__} or similar;
|
|
@item
|
|
GCC statement expressions (@samp{(x = (@{ int y = 4; y; @})}).
|
|
@end itemize
|
|
|
|
Indent size is 4.
|
|
The presentation is the one specified by 'indent -i4 -kr -nut'.
|
|
The TAB character is forbidden outside of Makefiles as is any
|
|
form of trailing whitespace. Commits containing either will be
|
|
rejected by the Subversion repository.
|
|
|
|
The main priority in FFmpeg is simplicity and small code size in order to
|
|
minimize the bug count.
|
|
|
|
Comments: Use the JavaDoc/Doxygen
|
|
format (see examples below) so that code documentation
|
|
can be generated automatically. All nontrivial functions should have a comment
|
|
above them explaining what the function does, even if it is just one sentence.
|
|
All structures and their member variables should be documented, too.
|
|
@example
|
|
/**
|
|
* @@file mpeg.c
|
|
* MPEG codec.
|
|
* @@author ...
|
|
*/
|
|
|
|
/**
|
|
* Summary sentence.
|
|
* more text ...
|
|
* ...
|
|
*/
|
|
typedef struct Foobar@{
|
|
int var1; /**< var1 description */
|
|
int var2; ///< var2 description
|
|
/** var3 description */
|
|
int var3;
|
|
@} Foobar;
|
|
|
|
/**
|
|
* Summary sentence.
|
|
* more text ...
|
|
* ...
|
|
* @@param my_parameter description of my_parameter
|
|
* @@return return value description
|
|
*/
|
|
int myfunc(int my_parameter)
|
|
...
|
|
@end example
|
|
|
|
fprintf and printf are forbidden in libavformat and libavcodec,
|
|
please use av_log() instead.
|
|
|
|
Casts should be used only when necessary. Unneeded parentheses
|
|
should also be avoided if they don't make the code easier to understand.
|
|
|
|
@section Development Policy
|
|
|
|
@enumerate
|
|
@item
|
|
Contributions should be licensed under the LGPL 2.1, including an
|
|
"or any later version" clause, or the MIT license. GPL 2 including
|
|
an "or any later version" clause is also acceptable, but LGPL is
|
|
preferred.
|
|
@item
|
|
You must not commit code which breaks FFmpeg! (Meaning unfinished but
|
|
enabled code which breaks compilation or compiles but does not work or
|
|
breaks the regression tests)
|
|
You can commit unfinished stuff (for testing etc), but it must be disabled
|
|
(#ifdef etc) by default so it does not interfere with other developers'
|
|
work.
|
|
@item
|
|
You do not have to over-test things. If it works for you, and you think it
|
|
should work for others, then commit. If your code has problems
|
|
(portability, triggers compiler bugs, unusual environment etc) they will be
|
|
reported and eventually fixed.
|
|
@item
|
|
Do not commit unrelated changes together, split them into self-contained
|
|
pieces. Also do not forget that if part B depends on part A, but A does not
|
|
depend on B, then A can and should be committed first and separate from B.
|
|
Keeping changes well split into self-contained parts makes reviewing and
|
|
understanding them on the commit log mailing list easier. This also helps
|
|
in case of debugging later on.
|
|
Also if you have doubts about splitting or not splitting, do not hesitate to
|
|
ask/discuss it on the developer mailing list.
|
|
@item
|
|
Do not change behavior of the program (renaming options etc) without
|
|
first discussing it on the ffmpeg-devel mailing list. Do not remove
|
|
functionality from the code. Just improve!
|
|
|
|
Note: Redundant code can be removed.
|
|
@item
|
|
Do not commit changes to the build system (Makefiles, configure script)
|
|
which change behavior, defaults etc, without asking first. The same
|
|
applies to compiler warning fixes, trivial looking fixes and to code
|
|
maintained by other developers. We usually have a reason for doing things
|
|
the way we do. Send your changes as patches to the ffmpeg-devel mailing
|
|
list, and if the code maintainers say OK, you may commit. This does not
|
|
apply to files you wrote and/or maintain.
|
|
@item
|
|
We refuse source indentation and other cosmetic changes if they are mixed
|
|
with functional changes, such commits will be rejected and removed. Every
|
|
developer has his own indentation style, you should not change it. Of course
|
|
if you (re)write something, you can use your own style, even though we would
|
|
prefer if the indentation throughout FFmpeg was consistent (Many projects
|
|
force a given indentation style - we do not.). If you really need to make
|
|
indentation changes (try to avoid this), separate them strictly from real
|
|
changes.
|
|
|
|
NOTE: If you had to put if()@{ .. @} over a large (> 5 lines) chunk of code,
|
|
then either do NOT change the indentation of the inner part within (do not
|
|
move it to the right)! or do so in a separate commit
|
|
@item
|
|
Always fill out the commit log message. Describe in a few lines what you
|
|
changed and why. You can refer to mailing list postings if you fix a
|
|
particular bug. Comments such as "fixed!" or "Changed it." are unacceptable.
|
|
@item
|
|
If you apply a patch by someone else, include the name and email address in
|
|
the log message. Since the ffmpeg-cvslog mailing list is publicly
|
|
archived you should add some SPAM protection to the email address. Send an
|
|
answer to ffmpeg-devel (or wherever you got the patch from) saying that
|
|
you applied the patch.
|
|
@item
|
|
When applying patches that have been discussed (at length) on the mailing
|
|
list, reference the thread in the log message.
|
|
@item
|
|
Do NOT commit to code actively maintained by others without permission.
|
|
Send a patch to ffmpeg-devel instead. If no one answers within a reasonable
|
|
timeframe (12h for build failures and security fixes, 3 days small changes,
|
|
1 week for big patches) then commit your patch if you think it is OK.
|
|
Also note, the maintainer can simply ask for more time to review!
|
|
@item
|
|
Subscribe to the ffmpeg-cvslog mailing list. The diffs of all commits
|
|
are sent there and reviewed by all the other developers. Bugs and possible
|
|
improvements or general questions regarding commits are discussed there. We
|
|
expect you to react if problems with your code are uncovered.
|
|
@item
|
|
Update the documentation if you change behavior or add features. If you are
|
|
unsure how best to do this, send a patch to ffmpeg-devel, the documentation
|
|
maintainer(s) will review and commit your stuff.
|
|
@item
|
|
Try to keep important discussions and requests (also) on the public
|
|
developer mailing list, so that all developers can benefit from them.
|
|
@item
|
|
Never write to unallocated memory, never write over the end of arrays,
|
|
always check values read from some untrusted source before using them
|
|
as array index or other risky things.
|
|
@item
|
|
Remember to check if you need to bump versions for the specific libav
|
|
parts (libavutil, libavcodec, libavformat) you are changing. You need
|
|
to change the version integer.
|
|
Incrementing the first component means no backward compatibility to
|
|
previous versions (e.g. removal of a function from the public API).
|
|
Incrementing the second component means backward compatible change
|
|
(e.g. addition of a function to the public API or extension of an
|
|
existing data structure).
|
|
Incrementing the third component means a noteworthy binary compatible
|
|
change (e.g. encoder bug fix that matters for the decoder).
|
|
@item
|
|
Compiler warnings indicate potential bugs or code with bad style. If a type of
|
|
warning always points to correct and clean code, that warning should
|
|
be disabled, not the code changed.
|
|
Thus the remaining warnings can either be bugs or correct code.
|
|
If it is a bug, the bug has to be fixed. If it is not, the code should
|
|
be changed to not generate a warning unless that causes a slowdown
|
|
or obfuscates the code.
|
|
@item
|
|
If you add a new file, give it a proper license header. Do not copy and
|
|
paste it from a random place, use an existing file as template.
|
|
@end enumerate
|
|
|
|
We think our rules are not too hard. If you have comments, contact us.
|
|
|
|
Note, these rules are mostly borrowed from the MPlayer project.
|
|
|
|
@section Submitting patches
|
|
|
|
First, (@pxref{Coding Rules}) above if you did not yet.
|
|
|
|
When you submit your patch, try to send a unified diff (diff '-up'
|
|
option). We cannot read other diffs :-)
|
|
|
|
Also please do not submit a patch which contains several unrelated changes.
|
|
Split it into separate, self-contained pieces. This does not mean splitting
|
|
file by file. Instead, make the patch as small as possible while still
|
|
keeping it as a logical unit that contains an individual change, even
|
|
if it spans multiple files. This makes reviewing your patches much easier
|
|
for us and greatly increases your chances of getting your patch applied.
|
|
|
|
Run the regression tests before submitting a patch so that you can
|
|
verify that there are no big problems.
|
|
|
|
Patches should be posted as base64 encoded attachments (or any other
|
|
encoding which ensures that the patch will not be trashed during
|
|
transmission) to the ffmpeg-devel mailing list, see
|
|
@url{http://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel}
|
|
|
|
It also helps quite a bit if you tell us what the patch does (for example
|
|
'replaces lrint by lrintf'), and why (for example '*BSD isn't C99 compliant
|
|
and has no lrint()')
|
|
|
|
Also please if you send several patches, send each patch as a separate mail,
|
|
do not attach several unrelated patches to the same mail.
|
|
|
|
@section New codecs or formats checklist
|
|
|
|
@enumerate
|
|
@item
|
|
Did you use av_cold for codec initialization and close functions?
|
|
@item
|
|
Did you add a long_name under NULL_IF_CONFIG_SMALL to the AVCodec or
|
|
AVInputFormat/AVOutputFormat struct?
|
|
@item
|
|
Did you bump the minor version number in @file{avcodec.h} or
|
|
@file{avformat.h}?
|
|
@item
|
|
Did you register it in @file{allcodecs.c} or @file{allformats.c}?
|
|
@item
|
|
Did you add the CodecID to @file{avcodec.h}?
|
|
@item
|
|
If it has a fourcc, did you add it to @file{libavformat/riff.c},
|
|
even if it is only a decoder?
|
|
@item
|
|
Did you add a rule to compile the appropriate files in the Makefile?
|
|
Remember to do this even if you're just adding a format to a file that is
|
|
already being compiled by some other rule, like a raw demuxer.
|
|
@item
|
|
Did you add an entry to the table of supported formats or codecs in the
|
|
documentation?
|
|
@item
|
|
Did you add an entry in the Changelog?
|
|
@item
|
|
If it depends on a parser or a library, did you add that dependency in
|
|
configure?
|
|
@item
|
|
Did you "svn add" the appropriate files before commiting?
|
|
@end enumerate
|
|
|
|
@section patch submission checklist
|
|
|
|
@enumerate
|
|
@item
|
|
Do the regression tests pass with the patch applied?
|
|
@item
|
|
Does @code{make checkheaders} pass with the patch applied?
|
|
@item
|
|
Is the patch a unified diff?
|
|
@item
|
|
Is the patch against latest FFmpeg SVN?
|
|
@item
|
|
Are you subscribed to ffmpeg-dev?
|
|
(the list is subscribers only due to spam)
|
|
@item
|
|
Have you checked that the changes are minimal, so that the same cannot be
|
|
achieved with a smaller patch and/or simpler final code?
|
|
@item
|
|
If the change is to speed critical code, did you benchmark it?
|
|
@item
|
|
If you did any benchmarks, did you provide them in the mail?
|
|
@item
|
|
Have you checked that the patch does not introduce buffer overflows or
|
|
other security issues?
|
|
@item
|
|
Did you test your decoder or demuxer against damaged data? If no, see
|
|
tools/trasher and the noise bitstream filter. Your decoder or demuxer
|
|
should not crash or end in a (near) infinite loop when fed damaged data.
|
|
@item
|
|
Is the patch created from the root of the source tree, so it can be
|
|
applied with @code{patch -p0}?
|
|
@item
|
|
Does the patch not mix functional and cosmetic changes?
|
|
@item
|
|
Did you add tabs or trailing whitespace to the code? Both are forbidden.
|
|
@item
|
|
Is the patch attached to the email you send?
|
|
@item
|
|
Is the mime type of the patch correct? It should be text/x-diff or
|
|
text/x-patch or at least text/plain and not application/octet-stream.
|
|
@item
|
|
If the patch fixes a bug, did you provide a verbose analysis of the bug?
|
|
@item
|
|
If the patch fixes a bug, did you provide enough information, including
|
|
a sample, so the bug can be reproduced and the fix can be verified?
|
|
Note please do not attach samples >100k to mails but rather provide a
|
|
URL, you can upload to ftp://upload.ffmpeg.org
|
|
@item
|
|
Did you provide a verbose summary about what the patch does change?
|
|
@item
|
|
Did you provide a verbose explanation why it changes things like it does?
|
|
@item
|
|
Did you provide a verbose summary of the user visible advantages and
|
|
disadvantages if the patch is applied?
|
|
@item
|
|
Did you provide an example so we can verify the new feature added by the
|
|
patch easily?
|
|
@item
|
|
If you added a new file, did you insert a license header? It should be
|
|
taken from FFmpeg, not randomly copied and pasted from somewhere else.
|
|
@item
|
|
You should maintain alphabetical order in alphabetically ordered lists as
|
|
long as doing so does not break API/ABI compatibility.
|
|
@item
|
|
Lines with similar content should be aligned vertically when doing so
|
|
improves readability.
|
|
@item
|
|
Did you provide a suggestion for a clear commit log message?
|
|
@end enumerate
|
|
|
|
@section Patch review process
|
|
|
|
All patches posted to ffmpeg-devel will be reviewed, unless they contain a
|
|
clear note that the patch is not for SVN.
|
|
Reviews and comments will be posted as replies to the patch on the
|
|
mailing list. The patch submitter then has to take care of every comment,
|
|
that can be by resubmitting a changed patch or by discussion. Resubmitted
|
|
patches will themselves be reviewed like any other patch. If at some point
|
|
a patch passes review with no comments then it is approved, that can for
|
|
simple and small patches happen immediately while large patches will generally
|
|
have to be changed and reviewed many times before they are approved.
|
|
After a patch is approved it will be committed to the repository.
|
|
|
|
We will review all submitted patches, but sometimes we are quite busy so
|
|
especially for large patches this can take several weeks.
|
|
|
|
When resubmitting patches, please do not make any significant changes
|
|
not related to the comments received during review. Such patches will
|
|
be rejected. Instead, submit significant changes or new features as
|
|
separate patches.
|
|
|
|
@section Regression tests
|
|
|
|
Before submitting a patch (or committing to the repository), you should at least
|
|
test that you did not break anything.
|
|
|
|
The regression tests build a synthetic video stream and a synthetic
|
|
audio stream. These are then encoded and decoded with all codecs or
|
|
formats. The CRC (or MD5) of each generated file is recorded in a
|
|
result file. A 'diff' is launched to compare the reference results and
|
|
the result file.
|
|
|
|
The regression tests then go on to test the FFserver code with a
|
|
limited set of streams. It is important that this step runs correctly
|
|
as well.
|
|
|
|
Run 'make test' to test all the codecs and formats.
|
|
|
|
Run 'make fulltest' to test all the codecs, formats and FFserver.
|
|
|
|
[Of course, some patches may change the results of the regression tests. In
|
|
this case, the reference results of the regression tests shall be modified
|
|
accordingly].
|
|
|
|
@bye
|