Messages

1

Host Forum: Sonic Visualiser / Re: cutting the soundfile

« on: May 19, 2009, 01:48:07 »

Not sure if this is possible entirely within SV, but if you note the start and end time of your selection, you can use a utility like SoX to slice the sound file: http://sox.sourceforge.net/. Hope this helps.

2

Host Forum: Sonic Visualiser / Problem Playing Low Sample-Rate WAV files

« on: May 19, 2009, 01:37:37 »

I'm not sure if this is a problem with my sound card driver, ALSA, Jack or Sonic Visualizer, but I am not able to play low-sample rate WAV files. I am working with data from a seismometer, and it is useful to listen to the audio from these devices, but they typically record data at sample rates of 256 Hz or less. So the sounds are very low freq. But they are useful to hear nonetheless. When I try to play them with Sonic Visualizer, I get the following error:

WARNING: AudioCallbackPlaySource::getSourceSamples: No ring buffer available for channel 0, returning no data here

I am able to play these sounds just fine with MPlayer through Jack using ALSA, so I think it is likely that this is a Sonic Visualizer bug, but I am not sure of this. If I resample my signal to 1024 Hz, it plays just fine, but doing this reduces the frequency resolution of the spectrograms created by Sonic Visualizer, which as far as I can tell, I do not have control over beyond 4x oversampling. Anyway, any help on this problem would be greatly appreciated.

I can provide a sample of my audio files if this would help.

Thanks,
Tim