Last modified: 2014-07-20 15:58:33 UTC
Created attachment 15929 [details] example broken ogv transcode output ogv transcodes of files with audio have broken audio tracks with ffmpeg2theora 0.29... Depending on the player, either the video plays silently (Chrome) or it sort of explodes and stops immediately (VLC, ogv.js). Tested on Mac OS X with libav 10.2 & ffmpeg2theora 0.29 installed via Homebrew. Tested on Ubuntu Trusty (MediaWiki-Vagrant) with libav 9.13 and ffmpeg2theora 0.29 from distro packages. Example command line as derived from wiki debug logs: ffmpeg2theora '/srv/images/3/3f/Jarry_-_Métro_de_Montréal_(640×360).ogv' -V '160' -F '15' -a '-1' -H '44100' -c '2' --no-upscaling --keyint '128' --buf-delay '256' --width '284' --height '160' --aspect '284:160' -o out-160p.ogv Note you can get that particular source video from <https://upload.wikimedia.org/wikipedia/commons/3/3f/Jarry_-_M%C3%A9tro_de_Montr%C3%A9al_%28640%C3%97360%29.ogv> ffmpeg2theora 0.29's console output on Ubuntu Trusty: [ogg @ 0xea7560] Multiple fisbone for the same stream is not implemented. Update your Libav version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented. [ogg @ 0xea7560] 29 bytes of comment header remain [ogg @ 0xea7560] truncated comment header, 1 comments not found [ogg @ 0xea7560] max_analyze_duration reached Input #0, ogg, from '/srv/images/3/3f/Jarry_-_Métro_de_Montréal_(640×360).ogv': Duration: 00:01:50.12, start: 0.000000, bitrate: 1140 kb/s Stream #0.0: Data: skeleton Stream #0.1: Video: theora, yuv420p, 640x368, 23.98 fps, 23.98 tbn, 23.98 tbc Metadata: ENCODER : ffmpeg2theora-0.26+svn16924 Stream #0.2: Audio: vorbis, 48000 Hz, stereo, fltp, 125 kb/s Metadata: ENCODER : ffmpeg2theora-0.26+svn16924 SOURCE_OSHASH : 96dc36c92cf57b6a Pixel Aspect Ratio: 1.00/1 Frame Aspect Ratio: 1.77/1 Resize: 640x368 => 284x160 Resample Framerate: 23.976 => 15.000 Resample: 48000Hz => 44100Hz [audioresample @ 0x104e500] Audio sample format conversion failed [audioresample @ 0x104e500] Audio sample format conversion failed .... lots more of these .... [audioresample @ 0x104e500] Audio sample format conversion failed [audioresample @ 0x104e500] Audio sample format conversion failed 0:01:49.93 audio: 0kbps video: 137kbps, ET: 00:00:00, est. size: 1.8 MB 0:01:50.12 audio: 0kbps video: 137kbps, time elapsed: 00:00:08
ogginfo has the following to say about the attached file: Negative or zero granulepos (0) on Vorbis stream outside of headers. This file was created by a buggy encoder Vorbis stream 3: Total data length: 29 bytes Playback length: 0m:00.000s Average bitrate: inf kb/s Logical stream 3 ended
I've got a patch in progress to optionally use avconv/ffmpeg instead of ffmpeg2theora to produce the .ogv transcodes; it seems to work on Trusty, but still testing on more files.
Change 145990 had a related patch set uploaded by Brion VIBBER: Optionally use avconv/ffmpeg for .ogv transcodes https://gerrit.wikimedia.org/r/145990
Change 145990 merged by jenkins-bot: Optionally use avconv/ffmpeg for .ogv transcodes https://gerrit.wikimedia.org/r/145990
Resetting to new, as that's more a work around then a fix to the underlying issue.
