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Andreas Rheinhardt fbf242a51d avcodec/frame_thread_encoder: Avoid allocations of AVPackets, fix deadlock 
Up until now, when doing frame thread encoding, each worker thread
tried to allocate an AVPacket for every AVFrame to be encoded; said
packets would then be handed back to the main thread, where the content
of said packet is copied into the packet actually destined for output;
the temporary AVPacket is then freed.

Besides being wasteful this also has another problem: There is a risk of
deadlock, namely if no AVPacket can be allocated at all. The user
doesn't get an error at all in this case and the worker threads will
simply try to allocate a packet again and again. If the user has
supplied enough frames, the user's thread will block until a task has
been completed, which just doesn't happen if no packet can ever be
allocated.

This patch instead modifies the code to allocate the packets during
init; they are then reused again and again.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2021-02-16 22:11:53 +01:00
compat All: update names in copyright headers 2021-01-20 01:02:56 -06:00
doc avfilter: add vif filter 2021-02-16 15:00:50 +01:00
ffbuild ffbuild/common: Make deletion of templates possible 2021-02-07 09:45:04 +01:00
fftools ffmpeg: add -fpsmax to clamp output framerate 2021-02-05 22:54:18 +05:30
libavcodec avcodec/frame_thread_encoder: Avoid allocations of AVPackets, fix deadlock 2021-02-16 22:11:53 +01:00
libavdevice avdevice/avdevice: Deprecate AVDevice Capabilities API 2021-02-14 21:07:57 +01:00
libavfilter avfilter/x86/vf_gblur: add postscale SIMD 2021-02-16 21:12:11 +01:00
libavformat avformat/rmdec: Check codec_length without overflow 2021-02-16 19:02:24 +01:00
libavresample
libavutil avutil/common: Move everything inside inclusion guards 2021-02-11 09:07:10 +01:00
libpostproc lavu/mem: move the DECLARE_ALIGNED macro family to mem_internal on next+1 bump 2021-01-01 14:14:57 +01:00
libswresample swresample/audioconvert: Fix left shift of negative value 2020-09-30 10:50:45 +02:00
libswscale lsws/ppc/yuv2rgb: Fix transparency converting from yuv->rgb32. 2021-01-24 17:17:29 +01:00
presets
tests fate/matroska: Add test for remuxing file with spherical metadata 2021-02-15 21:58:00 +01:00
tools tools/target_dec_fuzzer: Adjust threshold for wavpack 2021-02-16 19:02:24 +01:00
.gitattributes
.gitignore
.mailmap mailmap: add entry for myself 2020-07-13 11:24:04 +08:00
.travis.yml
Changelog avfilter: add vif filter 2021-02-16 15:00:50 +01:00
configure avcodec/aacdec_fixed: Move fixed-point sinewin tables to its only user 2021-02-07 10:28:29 +01:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md
LICENSE.md
MAINTAINERS MAINTAINERS: update names 2021-01-20 01:04:26 -06:00
Makefile tools/enum_options: fix build and add to Makefile 2020-11-20 15:20:24 +01:00
README.md
RELEASE RELEASE: We are after the 4.3 branch point, update for that 2020-06-10 00:20:24 +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 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.