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lord_didger 09-22-2011 05:19 PM

cracks while playing mp3 file
 
When I play an mp3 file in mplayer I hear cracks when sound is somehow 'intensive'. It is not present in audacity or when I play wav record (even when the mp3 converted to wav).

I have recently updated my wheeze. Some libs like libasound2 have been updated. I'm not sure which one cause the problem. I'm not sure when exactly it began because I think I made two consecutive updates and in the meantime I was listening to records that seems not concerned by the problem.

I haven't checked previous version of libasound2 and so on because apt-get wants to remove lots of programs during that and I wish to avoid this mass removal. How can I inspect the problem without the necessity to uninstall other software?

62chevy 09-22-2011 08:41 PM

Quote:

Originally Posted by lord_didger (Post 4479611)
When I play an mp3 file in mplayer I hear cracks when sound is somehow 'intensive'. It is not present in audacity or when I play wav record (even when the mp3 converted to wav).

I have recently updated my wheeze. Some libs like libasound2 have been updated. I'm not sure which one cause the problem. I'm not sure when exactly it began because I think I made two consecutive updates and in the meantime I was listening to records that seems not concerned by the problem.

I haven't checked previous version of libasound2 and so on because apt-get wants to remove lots of programs during that and I wish to avoid this mass removal. How can I inspect the problem without the necessity to uninstall other software?


You have two choices upgrade or downgrade. You can try the libasound2 in Sid or you can download the .deb from snapshot.debian.org . You can find your last version by searching /var/log/aptitude.

Downgrading would require apt-pinning.

jschiwal 09-22-2011 08:56 PM

One possibility is that the gain tag on the mp3 is high. You could try running normalize-mp3.

The gain is contained in a tag and does not alter the contents of the data. If your headroom is less then the gain tag value, you may experience clipping during playback.

lord_didger 09-24-2011 09:50 AM

normalization seems to work, but why do I need to do it in the first place? I used to listen to the same record before and no problem occurred.

lord_didger 09-24-2011 10:03 AM

moreover, is there an mp3 codec that supports ReplayGain tags? My mplayer seems not to read them.

jschiwal 10-02-2011 06:15 PM

I guess libmp3 doesn't support it. ( According to the mplayer.users mailing list ) I don't know about libmad.


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