[Webkit-unassigned] [Bug 85851] MediaStream API: support MediaStreamRecorder implementation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=85851

d2vid <webkitbugzilla at instapanel.com> changed:

           What    |Removed                     |Added
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                 CC|                            |webkitbugzilla at instapanel.c
                   |                            |om

--- Comment #70 from d2vid <webkitbugzilla at instapanel.com> ---
(In reply to Marcos G. from comment #65)
> unspecified pixel format
> Consider increasing the value for the 'analyzeduration' and 'probesize'

On my end, I'm able to use ffprobe on a Safari MediaRecorder created video if I increase the "-analyzeduration" and "-probesize" options. My (very incomplete) understanding is that this is caused by the moov atom header info being placed at the end of the file, so these option flags are require for ffprobe to scan enough of the file to find that info.

That being said, I'm still unable to play these videos outside of Safari/Quicktime, hoping that https://bugs.webkit.org/show_bug.cgi?id=216832 might resolve the issue.

Here's my command and output:

$ ffprobe -analyzeduration 2147483647 -probesize 2147483647 in.mp4 
ffprobe version N-93789-g06ba4783a0 Copyright (c) 2007-2019 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.3)
  configuration: --prefix=/usr/local --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --disable-stripping --enable-avresample --enable-avisynth --enable-libbs2b --enable-libcaca --enable-libfontconfig --enable-libfribidi --enable-libgme --enable-libgsm --enable-libopenjpeg --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtwolame --enable-libwavpack --enable-libwebp --enable-libxml2 --enable-libxvid --enable-libzmq --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-chromaprint --enable-frei0r --enable-shared --enable-nonfree
  libavutil      56. 26.101 / 56. 26.101
  libavcodec     58. 52.101 / 58. 52.101
  libavformat    58. 27.103 / 58. 27.103
  libavdevice    58.  7.100 / 58.  7.100
  libavfilter     7. 50.100 /  7. 50.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'in.mp4':
  Metadata:
    major_brand     : iso5
    minor_version   : 1
    compatible_brands: isomiso5hlsf
    creation_time   : 2020-09-29T14:46:52.000000Z
  Duration: 49:36:09.46, start: 3.668000, bitrate: 0 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 0 kb/s, 30.02 fps, 600 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      creation_time   : 2020-09-29T14:46:52.000000Z
      handler_name    : Core Media Video
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 132 kb/s (default)
    Metadata:
      creation_time   : 2020-09-29T14:46:52.000000Z
      handler_name    : Core Media Audio

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