https://bugzilla.wikimedia.org/show_bug.cgi?id=67953
Bug ID: 67953
Summary: ogv transcodes have broken audio tracks with
ffmpeg2theora 0.29
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: TimedMediaHandler
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected],
[email protected]
Web browser: ---
Mobile Platform: ---
Created attachment 15929
--> https://bugzilla.wikimedia.org/attachment.cgi?id=15929&action=edit
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
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