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Make video_reader backend be available in the binaries

See original GitHub issue

We currently provide two backends for video-reading: pyav (which is based on PyAV python library) and video_reader (which uses a custom C++ implementation based on ffmpeg). Due to complexities in the packaging of ffmpeg in the build process at the time of the video_reader release, for now if the user wants the faster video_reader backend they need to compile torchvision from source.

It would be preferable if we could instead make it more seamless to the user, by providing the necessary bits so that they can use the video_reader backend just by installing torchvision via either pip or conda.

Issue Analytics

State:
Created 3 years ago
Reactions:1
Comments:5 (5 by maintainers)

Top GitHub Comments

1reaction

andfoycommented, Sep 30, 2020

By judging by the FFmpeg documentation, they should be ABI compatible, since the major version is the same

conda-forge (4.3.1, SONAME=libavcodec.so.58, GPL)]

Just for the record, this one also segfaults

0reactions

jamt9000commented, Sep 30, 2020

Ok, I think I understand.

So the potential versions of ffmpeg one is likely to have installed through conda are:

anaconda (4.2.2, SONAME=libavcodec.so.58, GPL)

ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7.3.0 (crosstool-NG 1.23.0.449-a04d0)
  configuration: --prefix=/home/ubuntu/anaconda3/envs/ffmpegtest --cc=/tmp/build/80754af9/ffmpeg_1587154242452/_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --enable-avresample --enable-gmp --enable-hardcoded-tables --enable-libfreetype --enable-libvpx --enable-pthreads --enable-libopus --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-static --enable-version3 --enable-zlib --enable-libmp3lame --disable-nonfree --enable-gpl --enable-gnutls --disable-openssl --enable-libopenh264 --enable-libx264

conda-forge (4.3.1, SONAME=libavcodec.so.58, GPL)


ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7.5.0 (crosstool-NG 1.24.0.131_87df0e6_dirty)
  configuration: --prefix=/home/ubuntu/anaconda3/envs/ffmpegforge --cc=/home/conda/feedstock_root/build_artifacts/ffmpeg_1596712246804/_build_env/bin/x86_64-conda-linux-gnu-cc --disable-doc --disable-openssl --enable-avresample --enable-gnutls --enable-gpl --enable-hardcoded-tables --enable-libfreetype --enable-libopenh264 --enable-libx264 --enable-pic --enable-pthreads --enable-shared --enable-static --enable-version3 --enable-zlib --enable-libmp3lame

pytorch (4.3, SONAME=libavcodec.so.58, LGPL [segfaults and cannot encode x264?])


ffmpeg version 4.3 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7.3.0 (crosstool-NG 1.23.0.449-a04d0)
  configuration: --prefix=/home/ubuntu/anaconda3/envs/ffmpegtorch --cc=/opt/conda/conda-bld/ffmpeg_1597178665428/_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --disable-openssl --enable-avresample --enable-gnutls --enable-hardcoded-tables --enable-libfreetype --enable-libopenh264 --enable-pic --enable-pthreads --enable-shared --disable-static --enable-version3 --enable-zlib --enable-libmp3lame

pytorch (4.2, SONAME=libavcodec.so.58, LGPL [cannot encode x264?])


ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7.3.0 (crosstool-NG 1.23.0.449-a04d0)
  configuration: --prefix=/home/ubuntu/anaconda3/envs/ffmpegtorch42 --cc=/opt/conda/conda-bld/ffmpeg_1600723013725/_build_env/bin/x86_64-conda_cos6-linux-gnu-cc --disable-doc --disable-openssl --enable-avresample --enable-gnutls --enable-hardcoded-tables --enable-libfreetype --enable-libopenh264 --enable-pic --enable-pthreads --enable-shared --disable-static --enable-version3 --enable-zlib --enable-libmp3lame

Is that right? Which should at least be ABI compatible (in the eyes of the dynamic linker due to the same SONAME, and hopefully also in practice)

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