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FFmpeg git repo
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Zhao Zhili 670ff6c7ce avcodec/nvenc: rework on DTS generation 
Before the patch, the method to generate DTS only works with
timebase equal to 1/fps. With timebase like 1/1000

./ffmpeg -i foo.mp4 -an -c:v h264_nvenc -enc_time_base 1/1000 bar.mp4

pts 0    dts -3
pts 160  dts 37
pts 80   dts 77
pts 40   dts 117 <-- invalid
pts 120  dts 157
pts 320  dts 197
pts 240  dts 237
pts 200  dts 277 <-- invalid
pts 280  dts 317 <-- invalid

The generated DTS can be larger than PTS, since it only reorder the
input PTS and minus the number of frame delay, which doesn't take
timebase into account. It should minus the "time" of frame delay.

9a245bd trying to fix the issue, but the implementation is incomplete,
which only use time_base.num. Then it got reverted by ac7c265b33.

After this patch:

pts 0    dts -120
pts 160  dts -80
pts 80   dts -40
pts 40   dts 0
pts 120  dts 40
pts 320  dts 80
pts 240  dts 120
pts 200  dts 160
pts 280  dts 200

Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>
2024-08-02 17:57:19 +02:00
compat
doc lavc/qsvdec: Add VVC decoder 2024-07-30 13:40:21 +08:00
ffbuild
fftools fftools/ffprobe: implement dv_md_compression 2024-07-28 12:20:07 +02:00
libavcodec avcodec/nvenc: rework on DTS generation 2024-08-02 17:57:19 +02:00
libavdevice avdevice/dshow: Don't skip audio devices if no video device is present 2024-07-24 14:45:20 +02:00
libavfilter lavfi/framesync: avoid forcing frame writability unnecessarily 2024-07-31 11:12:45 +02:00
libavformat avformat/iamf_parse: Check for 0 samples 2024-08-01 00:18:02 +02:00
libavutil avutil/hwcontext_videotoolbox: Correctly set trc 2024-08-02 10:24:09 +08:00
libpostproc
libswresample swresample/swresample: Rectify invalid function in the documentation 2024-07-02 21:57:17 +02:00
libswscale lavu/riscv: count bytes rather than words for bswap32 2024-07-30 18:41:51 +03:00
presets
tests lavc/riscv: drop probing for F & D extensions 2024-08-01 22:56:50 +03:00
tools tools/target_dec_fuzzer: Adjust threshold for RV30 2024-07-16 18:43:15 +02:00
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.gitignore
.mailmap mailmap: add entry for myself 2024-07-15 01:59:37 +02:00
Changelog lavc/qsvdec: Add VVC decoder 2024-07-30 13:40:21 +08:00
configure configure: check if assembler supports RV zicbop 2024-07-30 18:41:51 +03:00
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MAINTAINERS MAINTAINERS: add myself as d3d12va_encode maintainer 2024-07-10 18:10:08 +02:00
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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.