Downloading an https file with gnutls is too slow

[Taner Sener]

Summary of the bug:

Downloading a file using https protocol is too slow. Download times out frequently. This happens when ffmpeg is built with gnutls on macOS.

This performance decrease is caused by ​https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/70d8077b795766e2486e6ec8110f22a97362d6d6. If you checkout master using a previous commit e.g. a1553b0cfbff92223caaed4103b92373b2339173 the same file is downloaded in 35 seconds.

See attachments provided.

How to reproduce:

% ffmpeg -y -report -i https://snapcellvideos.s3.amazonaws.com/manual/24/manualupload_16098586962947166522.mp4 -c:v mpeg4 /tmp/latest.mp4
ffmpeg version N-101485-g16e8ea0dde Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.29)
  configuration: --enable-gnutls
  libavutil      56. 68.100 / 56. 68.100
  libavcodec     58.130.100 / 58.130.100
  libavformat    58. 72.100 / 58. 72.100
  libavdevice    58. 12.100 / 58. 12.100
  libavfilter     7.109.100 /  7.109.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100

[Taner Sener]

Console output for the same command executed on master with commit a1553b0cfbff92223caaed4103b92373b2339173

[Taner Sener]

report file created by the command

[Taner Sener]

Console output

[Andriy Gelman]

I sent in a patch:
​https://patchwork.ffmpeg.org/project/ffmpeg/patch/20210314045432.214832-1-andriy.gelman@gmail.com/

Could you leave the link for a bit longer so that others could test, please?

[Taner Sener]

Replying to taliho:

I sent in a patch:
​https://patchwork.ffmpeg.org/project/ffmpeg/patch/20210314045432.214832-1-andriy.gelman@gmail.com/

Could you leave the link for a bit longer so that others could test, please?

Thanks! Sure, I'll reach out to the link owner and ask him to keep the link alive.

[Andriy Gelman]

Fixed in 9383885c0d2155b1f9e65c08c3f35d190ae2ba98