OGV encoding garbled

[RavenWorks]

Summary of the bug: Trying to output an OGV file results in a file that can be opened by video players, but whose picture is obsucred by flashing scrambled nonsense
How to reproduce: Seems to happen with any input file, but I can at least confirm this one: ​https://file-examples.com/wp-content/uploads/2017/04/file_example_MP4_480_1_5MG.mp4

ffmpeg -i file_example_MP4_480_1_5MG.mp4 out.ogv
ffmpeg version git-2020-06-28-4cfcfb3 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200621
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 55.100 / 56. 55.100
  libavcodec     58. 93.100 / 58. 93.100
  libavformat    58. 47.100 / 58. 47.100
  libavdevice    58. 11.100 / 58. 11.100
  libavfilter     7. 86.100 /  7. 86.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file_example_MP4_480_1_5MG.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41isomavc1
    creation_time   : 2015-08-07T09:13:02.000000Z
  Duration: 00:00:30.53, start: 0.000000, bitrate: 411 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 480x270 [SAR 1:1 DAR 16:9], 301 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Video Handler
      encoder         : AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 112 kb/s (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Audio Handler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> theora (libtheora))
  Stream #0:1 -> #0:1 (aac (native) -> vorbis (libvorbis))
Press [q] to stop, [?] for help
Output #0, ogv, to 'out.ogv':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41isomavc1
    encoder         : Lavf58.47.100
    Stream #0:0(und): Video: theora (libtheora), yuv420p(progressive), 480x270 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Video Handler
      encoder         : Lavc58.93.100 libtheora
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: mp42mp41isomavc1
    Stream #0:1(und): Audio: vorbis (libvorbis), 48000 Hz, stereo, fltp (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Audio Handler
      encoder         : Lavc58.93.100 libvorbis
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: mp42mp41isomavc1
frame=  901 fps=272 q=-0.0 Lsize=     755kB time=00:00:30.52 bitrate= 202.8kbits/s speed=9.22x
video:737kB audio:1kB subtitle:0kB other streams:0kB global headers:7kB muxing overhead: 2.311721%

[RavenWorks]

the output that I get from ffmpeg

[RavenWorks]

screenshot of a frame of the output, in case playback is inconsistent

[Carl Eugen Hoyos]

You are not the first to report this, I suspect this is a packaging (or compilation) issue.

$ ffmpeg -i file_example_MP4_480_1_5MG.mp4 out.ogv
ffmpeg version N-98351-ge409262837 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (SUSE Linux)
  configuration: --enable-libtheora --enable-libvorbis
  libavutil      56. 55.100 / 56. 55.100
  libavcodec     58. 93.101 / 58. 93.101
  libavformat    58. 47.100 / 58. 47.100
  libavdevice    58. 11.100 / 58. 11.100
  libavfilter     7. 86.100 /  7. 86.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file_example_MP4_480_1_5MG.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41isomavc1
    creation_time   : 2015-08-07T09:13:02.000000Z
  Duration: 00:00:30.53, start: 0.000000, bitrate: 411 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 480x270 [SAR 1:1 DAR 16:9], 301 kb/s, 30 fps, 30 tbr, 30 tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Video Handler
      encoder         : AVC Coding
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 112 kb/s (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Audio Handler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> theora (libtheora))
  Stream #0:1 -> #0:1 (aac (native) -> vorbis (libvorbis))
Press [q] to stop, [?] for help
Output #0, ogv, to 'out.ogv':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41isomavc1
    encoder         : Lavf58.47.100
    Stream #0:0(und): Video: theora (libtheora), yuv420p(progressive), 480x270 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Video Handler
      encoder         : Lavc58.93.101 libtheora
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: mp42mp41isomavc1
    Stream #0:1(und): Audio: vorbis (libvorbis), 48000 Hz, stereo, fltp (default)
    Metadata:
      creation_time   : 2015-08-07T09:13:02.000000Z
      handler_name    : L-SMASH Audio Handler
      encoder         : Lavc58.93.101 libvorbis
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: mp42mp41isomavc1
frame=  901 fps=204 q=-0.0 Lsize=     756kB time=00:00:30.52 bitrate= 202.9kbits/s speed= 6.9x    
video:738kB audio:1kB subtitle:0kB other streams:0kB global headers:7kB muxing overhead: 2.296290%

[RavenWorks]

So where should I take this from here, if it's a known problem that won't be fixed? I'm running the latest of the "Windows builds from Zeranoe", linked by the official FFmpeg.org download page; whose problem is this if not FFmpeg's? (The Zeranoe page has no kind of contact/feedback page to communicate this to?)

[Carl Eugen Hoyos]

I am not sure if it helps anybody if we remove the link to Zeranoe's download page, and we have no means to reach him either.

[RavenWorks]

But also like, if it's possible for FFmpeg to be built in a way that reports no errors but the result partially doesn't work, where is an appropriate place for people to discuss and bisect what causes that, if not the FFmpeg bug tracker?

If we do wind up narrowing it down to a bug in a certain compiler or something, the issue could absolutely be moved there, but until we do, we just have several people all having the same mysterious issue with FFmpeg, with nowhere to discuss it because some other people *don't* have the bug, which (I guess) disqualifies it from the bug tracker?

Regardless of the "cause" of this bug, where would be a better place to move forward with it than here?

[Ted]

I made a similar ticket #8775. If using 32 bit binaries is an option for you.