#1124 Loss of Sync - Speeds Up

One Of These Days
open
nobody
sequencer (64)
2
2013-10-01
2008-01-19
No

After doing quite a lot of editing in the matrix editor (I never use notation) when playing the composition it will suddenly speed up dramatically. If it is left, it will eventually settle down again, but the problem may reoccur. Quiting and restarting Rosegarden seems to clear the problem.

This happens on V1.4 through to V1.6.

I'm using 64Studio on a dual core 64bit athlon.

I've heard this mentioned on LAU newsgroup but don't see it reported here as a bug.

Discussion

  • D. Michael McIntyre

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    It may be real enough, but I can't repeat it, and "quite a lot of editing" is too subjective to be of any real use. I'm afraid there is no way to even attempt to resolve this one without a more precise roadmap for repeating it.

    Repeatability is the key. If you can't spell out a way to repeat it at least 50% of the time, then we have no hope of ever figuring it out. (Unfortunately, this may also mean if it can't be repeated on a plain single core 32-bit system too. We can't test with what we don't own.) I'm afraid that's just the nature of the game, and a lesson I had to learn first-hand myself, after I filed entirely too many random flake bug reports that were totally useless in the end; even though the symptoms I observed and reported were obviously real enough.

     
  • Will Godfrey

    Will Godfrey - 2008-04-24

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    I have confirmed that this bug still exists.

    No immediate resolution is likely.

     
  • Will Godfrey

    Will Godfrey - 2008-04-24

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    It seems I've found a solution (but not really the cause)

    The default Sequencer timing source is (auto). I have no idea what source that actually is, but if I change it to RTC timer the problem goes away. Set it to auto again and it reappears.

    This is on 64studio V 2.0, with an AMD dual core Athlon

     
  • D. Michael McIntyre

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    Well what do you know. I just witnessed this myself. Tempo sped up to about double halfway through about the 20th time in a row I played through this same composition I was editing. Then it happened again a couple of iterations later.

    Damn strange. I am on a dual core system now, and I haven't used Rosegarden for much creative work since I switched over to this computer. They could be related. It could be that I would have witnessed this sooner if I had sat down to work on something more substantive than yet another cherry picked demo example sooner.

    Interesting.

    Leaving it at an 8 though, because I'm sure we'll never actually figure out why this is happening.

     
  • Marc Brevoort

    Marc Brevoort - 2009-01-03

    I experienced this in 1.6.1. Running ubuntu studio 8.04
    on dual core athlon.
    In my case it happened in a song with tempo information,
    to allow playing back MIDI along with an audio stream.
    Before speeding up, tended to go 'out of sync' more
    subtly first.

     
  • Jani Frilander

    Jani Frilander - 2009-08-17

    This has happened for me too a few times. Changing timer source fixed it.

     
  • D. Michael McIntyre

    • milestone: --> One Of These Days
     
  • D. Michael McIntyre

    I've been using and developing on the same computer for years now, a quad core 64-bit, and just lately I've been noticing MIDI timing is very screwy.

    Linux audio sucks. It's probably the damn timers, and nothing we can do about it, since the only timer that's good is the one that crashes most people's computers to a hard freeze most of the time. Including mine. Sigh.

     

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