[Lmuse-developer] [ lmuse-Bugs-1399063 ] wave track crackles on start/jump

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Bugs item #1399063, was opened at 2006-01-07 02:22
Message generated for change (Comment added) made by deathpudding
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: deathpudding (deathpudding)
Assigned to: Robert Jonsson (spamatica)
Summary: wave track crackles on start/jump

Initial Comment:
When a part on a wave track is used at the beginning of
a song, the sample crackles (level meter drops to 0)
quite badly for a few seconds when the song begins
playing. This also happens to a lesser degree when
jumping into a wave part from another position. The
problem does not coincide with any xruns.

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>Comment By: deathpudding (deathpudding)
Date: 2006-01-09 17:09

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I'm using MusE 0.7.2pre5, but the problem also occurred in
0.7.2pre4. I haven't used other versions.
My jack command line is jackd -R -t1000 -dalsa -dhw:0
-r48000 -p256 -n2 -P -S
The wave track starts the song and is the only thing
playing, and the system load is negligible.

This must be a problem with MusE rather than jack, because
even when running jackd with -p4096 -n4 the problem still
occurs, although the pops are less frequent (but still only
happen for a few seconds). Also, I recorded in Ardour the
output of the wave track and a softsynth playing
simultaneously via muse outputs, and only the wave track
crackled.

The crackling occurs most often after the song has been
playing and I stop it, jump to the beginning, and play it again.

Perhaps it is an issue with MusE's wave file
reading/buffering. If you still can't reproduce it, maybe
you could give me some insight about where to look in the code.

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Comment By: Robert Jonsson (spamatica)
Date: 2006-01-09 16:13

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I am not able to reproduce this. 
Could you tell us a little bit about your system.  
Is it a complex piece of music or does it happen as soon 
as you add a wave track? 
What jack buffers do you use? 
 
The only way I can imagine this happening is with high 
system load and very small jack buffers. 
 
Btw, what muse version are you trying? 

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