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 Post subject: Crackling in output files, and a solution
 Post Posted: Fri Sep 09, 2005 9:36 am 
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I converted a large of WMA files to MP3 and and was disappointed to find many had crackling in them, which sounded like a poorly ripped CD.

I intentionally did not use the computer while it was encoding. There were minimal other processes running, but the machine was connected to the network in case MuvAudio had to obtain any licenses.

The crackling is quite difficult to hear. It's most noticable on quiet parts of songs, or where there is a long continuous tone.

I compared the bad tracks with the originals, and they were fine - the crackling was only in the converted files.

To investigate further, I used the Audio Repeater program of Virtual Audio Cable, to redirect the sound to my hardware soundcard, so that I could 'hear' the data that was being passed to MuvAudio.

Suprisingly, I could actually hear crackling as I played the tracks in Windows Media Player. The crackling seemed to come and go, it was hard to consistently reproduce. However, I found that if I moved my (USB) mouse very fast. I could create the crackling. I assume the problem is related to hardware interrupts. Strangely, I could not reproduce the problem with my hardware sound card - it only happened with the virtual sound cards..

The solution is simple - just go into the VAC Control Panel and change the mode from ASync to Sync on each of the virtual cables.

The VAC manual goes into the details of what this setting means.

I still have to convert all my files again, but I think it has solved the problem.


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 Post Posted: Fri Sep 09, 2005 12:59 pm 
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That is strange. By default the cables should be set to Async mode. Did you change these from the default or were they that way from the start. Technically, MuvAudio should freeze if the VAC's are in Sync mode because WMP polls the audio devices by sending multiple signals at different khz to see what is available. VAC is not compatible in sync mode with players that do this, which in turn, causes MuvAudio to freeze.

If you found a solution the problem, that is good news and we appreciate it greatly.

Thank you,

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 Post Posted: Fri Sep 09, 2005 1:02 pm 
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Yes, they were at Async to start with. I originally had written it the wrong way around above, which might have been the version you originally saw.

I will post my results with MuvAudio shortly.


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 Post Posted: Fri Sep 09, 2005 1:22 pm 
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You can report this issue specific to VAC by going to http://software.muzychenko.net/eng/vac.html and emailing Eugene directly with the noise issue with the usb mouse.

It will help him pinpoint the issue and offer a possible fix in the future when he returns from his excursion (he should still answer your email, though).

Thanks,

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