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Fei Wang 26890b6b67 lavfi/overlay_vaapi: set defalut alpha value as 1.0 
The present default value of 0 will render the overlay video invisible.
A default of 1.0 is consistent with most common use cases.

Signed-off-by: Fei Wang <fei.w.wang@intel.com>
Reviewed-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>
 		2022-08-09 14:02:25 +08:00
compat avfilter: add chromakey_cuda filter 2022-07-10 17:20:15 +02:00
doc lavfi/overlay_vaapi: set defalut alpha value as 1.0 2022-08-09 14:02:25 +08:00
ffbuild ffbuild/common: Fix CPPFLAGS applied for compiling C++ files 2022-05-24 21:30:52 +02:00
fftools fftools/ffmpeg: move handling corrupt packets to the input thread 2022-08-08 16:20:58 +02:00
libavcodec avcodec/nvdec: Use av_buffer_replace() where appropriate 2022-08-08 11:42:28 +02:00
libavdevice avdevice/v4l2: fix leak of timefilter 2022-08-03 17:52:25 +08:00
libavfilter lavfi/overlay_vaapi: set defalut alpha value as 1.0 2022-08-09 14:02:25 +08:00
libavformat avformat/movenc: Remove experimental status of flac-in-MP4 muxing 2022-08-08 16:19:38 +02:00
libavutil x86/tx_float: save a branch during coefficient deinterleaving 2022-08-09 03:35:12 +02:00
libpostproc Bump versions after 5.1 branch 2022-07-13 00:29:05 +02:00
libswresample Bump versions after 5.1 branch 2022-07-13 00:29:05 +02:00
libswscale swscale/output: fix reading chroma values when generating vuya output 2022-08-08 09:39:33 -03:00
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tests checkasm: Silence warnings about unused return value from read() 2022-08-08 23:39:13 +03:00
tools tools/target_dec_fuzzer: set avctx->workaround_bugs flags 2022-07-26 09:15:16 -03:00
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Changelog avcodec: WBMP (Wireless Application Protocol Bitmap) image format 2022-08-07 19:18:18 +10:00
INSTALL.md
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MAINTAINERS MAINTAINERS: Split project server admin list 2022-08-07 22:01:21 +02:00
Makefile Makefile: Prompt for reconfigure on lavc/hwaccels.h modification 2022-07-01 00:34:38 +02:00
README.md
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RELEASE RELEASE: update after 5.1 branch 2022-07-13 00:31:42 +02:00
configure avcodec/flacdsp: Split encoder-only parts into a ctx of its own 2022-08-05 03:28:45 +02:00

README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides means to alter decoded audio and video through a directed graph of connected filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
  • ffplay is a minimalistic multimedia player.
  • ffprobe is a simple analysis tool to inspect multimedia content.
  • Additional small tools such as aviocat, ismindex and qt-faststart.

Documentation

The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.

Examples

Coding examples are available in the doc/examples directory.

License

FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.

Contributing

Patches should be submitted to the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.