RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-01-14 11:21:29 +00:00
Code Issues Projects Releases Wiki Activity
FFmpeg git repo
109,540 Commits 37 Branches 400 Tags 257 MiB
C 90.3%
Assembly 7.8%
Makefile 1.3%
C++ 0.2%
Objective-C 0.2%
Other 0.1%
dae3679a9b
Go to file
Derek Buitenhuis dae3679a9b mov: Disable advanced_editlist for fragmented MP4 input 
Advanced edit list support is entirely broken for fragmented MP4s,
currently. mov_fix_index is never run in mov_build_index, since
in fragmented MP4s the stco, stsz, stts, and stsc boxes have zero
entries, with the index being filled in as each fragment's trun
box is seen.

The result of this is that the skip samples is never set properly,
since half the code thinks it doesn't need to, as advanced_editlist
is enabled, but as mov_fix_index is never called, it doesnt get set.
This means that any edits for e.g. priming are not properly applied
as skip samples side data.

This also means remuxing to fragmented MP4 from progressive MP4 with
lavf will quietly drop the edit list, currently.

Example:

    $ ffmpeg -loglevel quiet -advanced_editlist 1 -i non_fragmented.mp4 -f md5 -
    MD5=d02d929f8eb4edef624758a298d5f7c6
    $ ffmpeg -loglevel quiet -advanced_editlist 0 -i non_fragmented.mp4 -f md5 -
    MD5=d02d929f8eb4edef624758a298d5f7c6
    $ ffmpeg -loglevel quiet -advanced_editlist 1 -i fragmented.mp4 -f md5 -
    MD5=e38b110f586fa886ff94e0ca98a95d59 <-- wrong, extra samples are output instead of being skipped
    $ ffmpeg -loglevel quiet -advanced_editlist 0 -i fragmented.mp4 -f md5 -
    MD5=d02d929f8eb4edef624758a298d5f7c6

We cannot call mov_fix_index after reading a trun box
since mov_fix_index seems to assume it is only called once, on a
fully complete index, an multiple calls to it don't seem like
they'd work, so the "best" option seems to be disabling advanced
edit list support entirely for the time being, as it is broken
for these types of files.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
2023-01-09 15:23:41 +00:00
compat
doc libavcodec/qsvenc_av1: Add max_frame_size support to av1_qsv encoder 2023-01-09 13:56:03 +08:00
ffbuild
fftools
libavcodec libavcodec/qsvenc_av1: Add max_frame_size support to av1_qsv encoder 2023-01-09 13:56:03 +08:00
libavdevice
libavfilter avfilter/paletteuse: use explicit key indexes in set_frame_lut 2023-01-03 17:29:13 +01:00
libavformat mov: Disable advanced_editlist for fragmented MP4 input 2023-01-09 15:23:41 +00:00
libavutil avutil/tx_template: Use more unsigned ints to avoid undefined overflows 2022-12-25 19:33:24 +01:00
libpostproc
libswresample swresample/swresample_frame: fix regression in detecting changes 2023-01-04 18:19:07 +01:00
libswscale
presets
tests lavc/tests: add a cached bitstream reader test 2023-01-06 11:01:00 +01:00
tools
.gitattributes
.gitignore
.mailmap
.travis.yml
Changelog avfilter: add adrc filter 2022-12-19 20:43:58 +01:00
configure avcodec/mediacodecdec: add AV1 decoding support 2023-01-03 19:23:03 +08:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md
LICENSE.md
MAINTAINERS
Makefile
README.md
RELEASE

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.