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Andreas Rheinhardt 1d9aac9c4b avcodec/mpegvideo_dec: Don't use MotionEstContext as scratch space 
Decoders that might use quarter pixel motion estimation
(namely MPEG-4 as well as the VC-1 family) currently
use MpegEncContext.me.qpel_(put|avg) as scratch space
for pointers to arrays of function pointers.
(MotionEstContext contains such pointers as it supports
quarter pixel motion estimation.) The MotionEstContext
is unused apart from this for the decoding part of
mpegvideo.

Using the context at all is for decoding is actually
unnecessary and easily avoided: All codecs with
quarter pixels set me.qpel_avg to qdsp.avg_qpel_pixels_tab,
so one can just unconditionally use this in ff_mpv_reconstruct_mb().
MPEG-4 sets qpel_put to qdsp.put_qpel_pixels_tab
or to qdsp.put_no_rnd_qpel_pixels_tab based upon
whether the current frame is a b-frame with no_rounding
or not, while the VC-1-based decoders set it to
qdsp.put_qpel_pixels_tab unconditionally. Given
that no_rounding is always zero for VC-1, using
the same check for VC-1 as well as for MPEG-4 would work.
Since ff_mpv_reconstruct_mb() already has exactly
the right check (for hpeldsp), it can simply be reused.

(This change will result in ff_mpv_motion() receiving
a pointer to an array of NULL function pointers instead
of a NULL pointer for codecs without qpeldsp (like MPEG-1/2).
It doesn't matter.)

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-11-06 17:41:26 +01:00
compat compat/cuda: switch from powf to __powf intrinsic 2022-09-03 20:27:34 +02:00
doc Revert "lavc: deprecate avcodec_dct, av_fft, av_dct, av_rdft and av_mdct" 2022-11-06 12:15:56 -03:00
ffbuild configure: probe RISC-V Vector extension 2022-09-27 13:19:52 +02:00
fftools ffmpeg: fix implementation of updated input start time 2022-11-03 14:38:42 +05:30
libavcodec avcodec/mpegvideo_dec: Don't use MotionEstContext as scratch space 2022-11-06 17:41:26 +01:00
libavdevice avdevice/avdevice: Fix mismatching argument name 2022-10-17 09:51:47 +02:00
libavfilter lavfi/vf_fieldmatch: keep fields as-is if not matched properly 2022-11-05 11:50:36 +01:00
libavformat avformat/replaygain: avoid undefined / negative abs 2022-11-04 22:44:16 +01:00
libavutil avutil/dict: Improve documentation 2022-11-06 08:26:50 +01:00
libpostproc configure: always enable gnu_windres if available 2022-08-13 14:42:36 +02:00
libswresample swresample/rematrix: support mixing top front left/right channels 2022-11-03 19:39:52 -03:00
libswscale swscale/output: Bias 16bps output calculations to improve non overflowing range for GBRP16/GBRPF32 2022-11-04 22:44:16 +01:00
presets
tests imc: convert to lavu/tx, remove NIH iMDCT and replace with a standard one 2022-11-06 14:39:42 +01:00
tools tools/target_dec_fuzzer: Adjust threshold for FFV1 2022-10-20 21:42:21 +02:00
.gitattributes
.gitignore gitignore: add config_components.h 2022-03-17 18:35:41 -03:00
.mailmap mailmap: stop git lying about who I commit things as 2022-11-04 19:37:46 +01:00
.travis.yml
Changelog avfilter: add backgroundkey video filter 2022-11-05 10:52:39 +01:00
configure avcodec/vc1dec: Split VC-1 decoders from msmpeg4 2022-11-06 17:41:26 +01:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md
LICENSE.md
MAINTAINERS libavcodec: remove mdct15 2022-11-06 14:39:41 +01:00
Makefile configure: probe RISC-V Vector extension 2022-09-27 13:19:52 +02:00
README.md
RELEASE RELEASE: update after 5.1 branch 2022-07-13 00:31:42 +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.