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Niklas Haas 6225ad5c19 avcodec/dovi_rpu{enc,dec}: fix ms_weight handling 
The code as written was wrong. In the spec, these fields are treated
merely as plain integers in the range 0 to 4095. The only difference
between L2 and L8 is that L2.ms_weight also accepts an additional value
of -1, hence the extra sign bit. While it's likely that these are still
shifted integers in disguise, since all real-world samples seem to use
a value of 2048 here, the offset used in the code was wrong.

In addition, because the l8.ms_weight struct member is unsigned, these
wrong shifting semantics ended up overflowing the field, leading to
undefined behavior when transcoding. Fortunately, the damage was
relatively contained in practice, because it just corrupts the coding of
this field, which is ignored in practice in all implementations I have
seen.
2024-06-14 13:43:55 +02:00
compat avutil/common: Don't auto-include mem.h 2024-03-31 00:08:43 +01:00
doc avutil: rename av_mod_uintp2 to av_zero_extend 2024-06-13 20:35:57 -03:00
ffbuild riscv: add Zvbb vector bit manipulation extension 2024-05-11 11:38:49 +03:00
fftools fftools/ffmpeg_mux_init: Fix leak when using non-encoding option 2024-06-11 14:32:25 +02:00
libavcodec avcodec/dovi_rpu{enc,dec}: fix ms_weight handling 2024-06-14 13:43:55 +02:00
libavdevice avdevice/xcbgrab: Check sscanf() return 2024-06-12 00:39:11 +02:00
libavfilter avfilter/vf_rotate: Check ff_draw_init2() return value 2024-06-12 00:39:14 +02:00
libavformat avformat/mxfdec: use the newly added channel ids for more exact mapping 2024-06-12 19:37:01 +02:00
libavutil avutil/common: assert that bit position in av_zero_extend is valid 2024-06-13 20:36:09 -03:00
libpostproc avutil/common: Don't auto-include mem.h 2024-03-31 00:08:43 +01:00
libswresample avutil/common: Don't auto-include mem.h 2024-03-31 00:08:43 +01:00
libswscale riscv: probe for Zbb extension at load time 2024-06-11 20:12:37 +03:00
presets
tests checkasm/lls: add missing random values to the test buffers 2024-06-13 14:21:18 -03:00
tools tools/decode_simple: Check avcodec_send_packet() for errors on flushing 2024-05-28 03:48:06 +02:00
.gitattributes lavf/assenc: normalize line endings to \n 2024-02-11 17:01:07 -08:00
.gitignore gitignore: add config_components.h 2022-03-17 18:35:41 -03:00
.mailmap .mailmap: Update my mailmap entry 2024-02-23 00:17:21 +01:00
Changelog libavcodec/alpha: remove DSP & support code 2024-06-13 23:14:26 +02:00
configure libavcodec/alpha: remove DSP & support code 2024-06-13 23:14:26 +02:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS Use https for repository links 2023-03-01 21:59:10 +01:00
INSTALL.md
LICENSE.md
MAINTAINERS MAINTAINERS: add myself as *BSD maintainer 2024-05-13 03:40:16 +02:00
Makefile riscv: add Zvbb vector bit manipulation extension 2024-05-11 11:38:49 +03:00
README.md
RELEASE RELEASE: update after 7.0 branch 2024-04-02 13:02:39 -03:00

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.