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misalignment of sound in avi-file

 
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peterg
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PostPosted: Fri Aug 27, 2004 5:17 pm    Post subject: misalignment of sound in avi-file Reply with quote

Hi all,
when opening avi-files in Wavesurfer I've experiencing a strange behaviour during sound playback. Say, I've selected the starting point and end point of a fricative within a spetrogram. During playback more than this selection is played back (approx. 50 ms), e.g. part of a following vowel. It seems that the endpoint of any selection is expanded during playback. When I extract the wave-file out of the avi, re-open this wav, everything works fine. Has somebody any idea to solve this?

Thanks,
Peter
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peterg
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PostPosted: Sat Aug 28, 2004 9:52 am    Post subject: Re: misalignment of sound in avi-file Reply with quote

peterg wrote:
Hi all,
when opening avi-files in Wavesurfer I've experiencing a strange behaviour during sound playback. Say, I've selected the starting point and end point of a fricative within a spetrogram. During playback more than this selection is played back (approx. 50 ms), e.g. part of a following vowel. It seems that the endpoint of any selection is expanded during playback. When I extract the wave-file out of the avi, re-open this wav, everything works fine. Has somebody any idea to solve this?

Thanks,
Peter


While browsing through this forum I've found a workaround for this problem (thanks to Jonas):
Posted: Tue Oct 22, 2002 12:05 am

Yes, we have noticed this also, it appears that QuickTime requires some extra time for stopping the audio, which makes selection playback imprecise. This is independent of video format used.
What you can try is to turn down the volume on the QuickTime's audio (click on the little speaker at the bottom left of the video window) and turn up WaveSurfer's built-in audio playback volume, which is set to zero by the video plugin. This is done in Properties... | Playback. The problem with this solution is that you might experience A/V asyncrony (depending on processor load etc). But this is easy to check by turning QuickTime's volume back up. If you hear echoes during playback, then QuickTime and WaveSurfer playback are out of synch, otherwise you should be fine.

-Jonas
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