#123 wave track crackles on start/jump

closed-fixed
None
5
2010-01-06
2006-01-07
-
No

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.

Discussion

  • Robert Jonsson
    Robert Jonsson
    2006-01-09

    • assigned_to: nobody --> spamatica
     
  • Robert Jonsson
    Robert Jonsson
    2006-01-09

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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?

     
  • -
    -
    2006-01-09

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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.

     
  • Robert Jonsson
    Robert Jonsson
    2006-11-29

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    Originator: NO

    Sorry for taking so long.
    Where you running an SMP system when this happened? If that is the case I'm pretty sure this is the same as bug #1590605.

     
  • -
    -
    2006-11-29

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    SMT (hyperthread), yes.

     
  • Robert Jonsson
    Robert Jonsson
    2009-07-06

    As a work around for SMP issues (which unfortunately still exist) start MusE with
    taskset -c 1 muse

     
  • Robert Jonsson
    Robert Jonsson
    2009-12-22

    No longer happens on my system with 1.0 release. I consider it fixed and set it to pending.

     
  • Robert Jonsson
    Robert Jonsson
    2009-12-22

    • status: open --> pending-fixed
     
  • This Tracker item was closed automatically by the system. It was
    previously set to a Pending status, and the original submitter
    did not respond within 14 days (the time period specified by
    the administrator of this Tracker).

     
    • status: pending-fixed --> closed-fixed