https://bugzilla.wikimedia.org/show_bug.cgi?id=48029
Web browser: ---
Bug ID: 48029
Summary: crackling at start of OGG renditions of MIDI files
Product: MediaWiki extensions
Version: master
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Score
Assignee: wikibugs-l@lists.wikimedia.org
Reporter: sp...@wikimedia.org
CC: jger...@wikimedia.org
Classification: Unclassified
Mobile Platform: ---
Every audio file I've played generated by this (fantastic) extension has had
crackling in the first few seconds of music. Try e.g.
https://en.wikipedia.org/wiki/User:MarkAHershberger/Music_Sandbox : wait for
the player to appear and click play. I'm on Ubuntu and so far only other
developers on Linux have confirmed hearing a crackle, so it might be Linux
only.
It's not the MediaWiki media player; other .ogg files play fine e.g.
https://commons.wikimedia.org/wiki/Audio_files_of_medieval_music , and if I
download the .ogg generated by Score it crackles whether I play it in Firefox's
built in .ogg player, the rhythmbox player, or the gstreamer pipeline. If I
download the .midi file and generate it myself using the same "timidity" MIDI
converter that the Score extension uses (e.g. `/usr/bin/timidity -Ov
--output-file=timidity_out.ogg sample.midi`) it has the same crackle. It's not
the OGG format: other .ogg files such as
/usr/share/sounds/ubuntu/stereo/desktop-logout.ogg play fine, and the crackle
remains if I convert to a .wav file instead of a .ogg file.
The real proof that the problem lies in timidity would be to inspect the
waveform of the raw output file for crackles.
timidity bug reports suggest using its --output-24bit option for higher
quality. For that one sample file the crackle went away if I used both
--output-24bit and convert to a .wav file.
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