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Guangyu Sun 75510d7015 avformat/oggparsevorbis: Update end_trimming for the last packet 
Without end_trimming, the last packet will contain unexpected samples used
for padding.

This commit partially fixes #6367 when the audio length is long enough.

dd if=/dev/zero of=./silence.raw count=20 bs=500
oggenc --raw silence.raw --output=silence.ogg
oggdec --raw --output silence.oggdec.raw silence.ogg
ffmpeg -codec:a libvorbis -i silence.ogg -f s16le -codec:a pcm_s16le silence.libvorbis.ffmpeg.raw
ffmpeg -i silence.ogg -f s16le -codec:a pcm_s16le silence.native.ffmpeg.raw
ls -l *.raw

The original test case in #6367 is still not fixed due to a remaining issue.

The remaining issue is that ogg_stream->private is not kept during
ogg_save()/ogg_restore(). Field final_duration in the private data is
important to calculate end_trimming.

Some common operations such as avformat_open_input() and
avformat_find_stream_info() before reading packet will trigger ogg_save()
and ogg_restore().

Luckily, final_duration will not get updated until the last ogg page. The
save/restore mentioned above will not change final_duration most of the
time. But if the audio length is short, those reads may be performed on
the last ogg page, causing trouble keeping the correct value of
final_duration. We probably need a more complicated patch to address this
issue.

Signed-off-by: Guangyu Sun <gsun@roblox.com>
2021-07-12 09:54:47 +02:00
compat
doc avcodec/qsvenc: clip global_quality for ICQ modes. 2021-07-12 09:33:22 +05:30
ffbuild
fftools ffmpeg: add option recast_media 2021-07-11 11:54:20 +05:30
libavcodec avcodec/qsvenc: clip global_quality for ICQ modes. 2021-07-12 09:33:22 +05:30
libavdevice
libavfilter lavfi/dnn_backend_tf: Error Handling 2021-07-11 20:12:27 +08:00
libavformat avformat/oggparsevorbis: Update end_trimming for the last packet 2021-07-12 09:54:47 +02:00
libavutil
libpostproc
libswresample
libswscale swscale/slice: Fix wrong return on error 2021-07-09 15:21:37 +02:00
presets
tests
tools tools/target_dec_fuzzer: move maximum variables into function 2021-07-06 21:44:31 +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 a mean to alter decoded Audio and Video through chain of 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.