mirror of https://github.com/mpv-player/mpv
applied Diego's patch
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@5396 b3059339-0415-0410-9bf9-f77b7e298cf2
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gabucino
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<P><B><A NAME=2.1>2.1. Supported formats</A></B></P>
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<P>It is important to clarify a common mistake. When people see a file with a
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<B>.AVI</B> extension, they immediately conclude that it is not a MPEG file.
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<B>.AVI</B> extension, they immediately conclude that it is not an MPEG file.
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That is not true. At least not entirely. Contrary to popular belief such a file
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<B>can</B> contain MPEG1 video.</P>
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<P>You see, a <B>codec</B> is not the same as a <B>file format</B>.<BR>
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Video <B>codecs</B> are: MPEG1, MPEG2, DivX, Indeo5, 3ivx.<BR>
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Video <B>formats</B> are: MPG, AVI, ASF.<BR>
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Examples of video <B>codecs</B> are: MPEG1, MPEG2, DivX, Indeo5, 3ivx.<BR>
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Examples of file <B>formats</B> are: MPG, AVI, ASF.<BR>
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</P>
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<P>In theory, you can happily put an OpenDivX video and MP3 audio
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into a <B>MPG</B> format file. Most players will not play it, though, since
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they expect MPEG1 video and MP2 audio (<B>.MPG</B> does not have the
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necessary fields to describe its video and audio streams, like <B>.AVI</B>
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does). Or you might put MPEG1 video into an .AVI file. <A HREF="http://ffmpeg.sourceforge.net">FFmpeg</A>
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<P>In theory, you can put an OpenDivX video and MP3 audio
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into an <B>MPG</B> format file. However, most players will not play it, since
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they expect MPEG1 video and MP2 audio (unlike <B>AVI</B>, <B>MPG</B> does not have the
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necessary fields to describe its video and audio streams).
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Or you might put MPEG1 video into an AVI file. <A HREF="http://ffmpeg.sourceforge.net">FFmpeg</A>
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and <A HREF="encoding.html">MEncoder</A> can create these files.</P>
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<P>In contrast to that audio <B>codecs</B> and audio <B>formats</B> are basically the same terms.</P>
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<P><B><A NAME=2.1.1>2.1.1. Video formats</A></B></P>
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@ -39,18 +38,20 @@ and <A HREF="encoding.html">MEncoder</A> can create these files.</P>
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<P><B><A NAME=2.1.1.1>2.1.1.1. MPEG files</A></B></P>
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<P>
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<LI>MPG : This is the most <B>basic</B> form of the MPEG file formats. It contains
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<P>MPEG files come in different guises:</P>
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<UL>
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<LI>MPG: This is the most <B>basic</B> form of the MPEG file formats. It contains
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MPEG1 video, and MP2 (MPEG-1 layer 2) or rarely MP1 audio.</LI>
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<LI>DAT : This is the very same format as MPG with a different extension. It is used
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<LI>DAT: This is the very same format as MPG with a different extension. It is used
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on <B>Video CD</B>s. Due to the way VCDs are created and Linux is designed,
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the DAT files cannot be played nor copied from VCDs as regular files. You have
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to use the <CODE>-vcd</CODE> option to play the Video CD.</LI>
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<LI>VOB : This is the MPEG file format on <B>DVD</B>s. It is the same as MPG, plus the
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<LI>VOB: This is the MPEG file format on <B>DVD</B>s. It is the same as MPG, plus the
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capability to contain subtitles or non-MPEG (AC3) audio. It contains encoded MPEG2
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video and usually AC3 audio, but DTS, MP2 and uncompressed LPCM are allowed, too.<BR>
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<B>Read the <A HREF="cd-dvd.html#4.2">DVD section</A> !</B></LI>
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</P>
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</UL>
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<P>Series of frames form independent groups in MPEG files. This means that you
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can cut/join an MPEG file with standard file tools (like dd, cut), and it
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@ -72,26 +73,26 @@ It supports one video stream and 0 to 99 audio streams and can be as big as
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2GB. There exists an extension allowing bigger files called <B>OpenDMS</B>.
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M$ currently strongly discourages its use and encourages ASF/WMV. Not that
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anybody cares.<BR>
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<B>NOTE</B>: DV cameras can create two types of AVI formats. One is common and
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<B>NOTE:</B> DV cameras can create two types of AVI formats. One is common and
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playable, the other is neither.</P>
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<P>There are two kinds of AVI files:
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<P>There are two kinds of AVI files:</P>
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<UL>
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<LI><B>Interleaved</B>: Audio and video content is interleaved. This is the
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<LI><B>Interleaved:</B> Audio and video content is interleaved. This is the
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standard usage. Recommended and mostly used. Some tools create interleaved
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AVIs with bad sync. <B>MPlayer</B> detects these as interleaved, and this
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climaxes in loss of A/V sync, probably at seeking. These files should be
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played as non-interleaved (with the <CODE>-ni</CODE> option).</LI>
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<LI><B>Non-interleaved</B>: First comes the whole video stream, then the whole
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<LI><B>Non-interleaved:</B> First comes the whole video stream, then the whole
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audio stream. It thus needs a lot of seeking, making playing from network or
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CD-Rom difficult.</LI>
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</UL>
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</P>
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<P><B>MPlayer</B> supports two kinds of timings for AVI files:
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<P><B>MPlayer</B> supports two kinds of timings for AVI files:</P>
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<UL>
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<LI><B>bps-based</B>: It is based on the bitrate/samplerate of the video/audio stream. This
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method is used by most players, including avifile and windows media player.
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method is used by most players, including <A HREF="http://avifile.sourceforge.net">avifile</A>
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and windows media player.
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Files with broken headers, and files created with VBR audio but not
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VBR-compliant encoder will result in A/V desync with this method (mostly at
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seeking).</LI>
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@ -99,7 +100,6 @@ playable, the other is neither.</P>
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it uses the relative position of interleaved audio and video chunks, making
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badly encoded files with VBR audio playable.</LI>
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</UL>
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</P>
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<P>Any audio and video codec is allowed, but note that VBR audio is not well
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supported by most players. The file format makes it possible to use VBR
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@ -116,22 +116,22 @@ variants of ASF, v1.0 and v2.0. v1.0 is used by their media tools (windows
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media player and windows media encoder) and is very secret. v2.0 is published
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and patented :). Of course they differ, there is no compatibility at all (it is
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just another legal game). <B>MPlayer</B> supports only v1.0, as nobody has ever seen
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v2.0 files :) . Note, that .ASF files nowdays come with the extension .WMA or
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v2.0 files :). Note that ASF files nowadays come with the extension .WMA or
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.WMV.</P>
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<P><B><A NAME=2.1.1.4>2.1.1.4. QuickTime/MOV files</A></B></P>
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<P>These are from the Macintosh. They usually have a .QT or .MOV extension. Note
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<P>These formats were designed by Apple. They usually have a .QT or .MOV extension. Note
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that since the MPEG4 group chose QuickTime as the recommended file format
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for MPEG4, their .MOV files come with a .MPG or .MP4 extension (Interestingly
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the video and audio streams in these files are real .MPG and .AAC files. With the
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<CODE>-dumpvideo/-dumpaudio</CODE> options you can even extract them!).</P>
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for MPEG4, their MOV files come with a .MPG or .MP4 extension (Interestingly
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the video and audio streams in these files are real MPG and AAC files. With the
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<CODE>-dumpvideo</CODE> and <CODE>-dumpaudio</CODE> options you can even extract them!).</P>
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<P><B>Codecs</B>: Any codec is allowed, both CBR and VBR. Note: most new QuickTime files use
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<B>Sorensen</B> video and QDesign Music audio. These formats are completely
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secret, and only Apple's QuickTime player is able to play these files (on
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win/mac only).</P>
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<B>Sorensen</B> video and QDesign Music audio. These formats have not been
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disclosed and will probably remain so in the future, making Apple's QuickTime
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player the only player able to play these files (on Windows/Mac OS only).</P>
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<P><B><A NAME=2.1.1.5>2.1.1.5. VIV files</A></B></P>
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@ -144,8 +144,8 @@ and most files lack even keyframes, so forget seeking!</P>
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of VIVO/2.0 files is a modified, nonstandard <B>h.263v2</B>. The audio is the same,
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it may be <B>g.723</B> (standard), or <B>Vivo Siren</B>.</P>
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<P>See the <A HREF=codecs.html#2.2.1.4>VIVO video codec</A>
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and <A HREF=codecs.html#2.2.2.4>VIVO audio codec</A> sections for installation
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<P>See the <A HREF="codecs.html#2.2.1.4">VIVO video codec</A>
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and <A HREF="codecs.html#2.2.2.4">VIVO audio codec</A> sections for installation
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instructions.</P>
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@ -169,7 +169,7 @@ and <A HREF="codecs.html#2.2.2.5">RealAudio</A> codecs.
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<P><B><A NAME=2.1.1.8>2.1.1.8. NuppelVideo files</A></B></P>
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<P><A HREF="http://mars.tuwien.ac.at/~roman/nuppelvideo">NuppelVideo</A>
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is a TV grabber tool (AFAIK:). <B>MPlayer</B> can read its <CODE>.nuv</CODE>
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is a TV grabber tool (AFAIK:). <B>MPlayer</B> can read its .NUV
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files (only NuppelVideo 5.0). Those files can contain uncompressed YV12,
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YV12+RTJpeg compressed, YV12 RTJpeg+lzo compressed, and YV12+lzo compressed
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frames. <B>MPlayer</B> decodes (and also <B>encodes</B> them with MEncoder to
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