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Andreas Rheinhardt 7b539ca3e6 avcodec/mpeg_er: Simplify disabling IDCT 
The error resilience code does not make up block coefficients
and therefore zeroes them in order to disable the IDCT.
But this can be done in a simpler manner, namely by setting
block_last_index to a negative value. Doing so also has
the advantage that the dct_unquantize functions are never even
called for those codecs that do not use ff_mpv_reconstruct_mb()
for ordinary decoding (namely RV-30/40 and the VC-1 family).

This approach would not work for intra macroblocks (there is always
at least one coefficient for them and therefore there is no check
for block_last_index for them), but this does not happen at all.
Add an assert for this.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-06-20 18:58:39 +02:00
compat avutil/common: Don't auto-include mem.h 2024-03-31 00:08:43 +01:00
doc avutil/stereo3d: Fill out stereo info provided by Vision Pro files 2024-06-18 14:47:40 +01:00
ffbuild riscv: add Zvbb vector bit manipulation extension 2024-05-11 11:38:49 +03:00
fftools fftools/ffprobe: Print more Stereo 3D info from side data 2024-06-18 14:47:40 +01:00
libavcodec avcodec/mpeg_er: Simplify disabling IDCT 2024-06-20 18:58:39 +02:00
libavdevice avdevice/avfoundation: add external video devices 2024-06-20 18:52:06 +02:00
libavfilter avfilter/qsvvpp: Remove unreachable code 2024-06-19 13:23:07 +02:00
libavformat avformat: split off generic NAL function helpers into their own file 2024-06-20 08:57:45 -03:00
libavutil avutil/stereo3d: Fill out stereo info provided by Vision Pro files 2024-06-18 14:47:40 +01:00
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 swscale/aarch64: add neon {lum,chr}ConvertRange 2024-06-18 23:12:41 +02:00
presets
tests avcodec/me_cmp: Zero MECmpContext in ff_me_cmp_init() 2024-06-20 18:58:38 +02:00
tools tools/decode_simple: Check avcodec_send_packet() for errors on flushing 2024-05-28 03:48:06 +02:00
.gitattributes
.gitignore
.mailmap .mailmap: Update my mailmap entry 2024-02-23 00:17:21 +01:00
Changelog avcodec: add external enc libvvenc for H266/VVC 2024-06-15 21:00:05 +08:00
configure configure: Remove obsolete mpeg4_decoder->mpeg4video_parser dependency 2024-06-20 18:58:38 +02:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md
LICENSE.md
MAINTAINERS MAINTAINERS: Update the entries for the release maintainer for FFmpeg 2024-06-19 12:36:02 +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.