Re: severe discrepancies in mp3 frame counts

Might be a variable-rate encoding issue, but that's just a guess.
Marcel

Anthony DiSante wrote:
> Hello,
> 
> I'm seeing drastic discrepancies (an order of magnitude) between the mp3
> frame counts reported by xmms and the perl module MP3::Info.  This 
> happens with many, but not all, MP3 files I've tried.  Here are some 
> example files:
> 
> "This Family Name" or "Distance" here:
> http://www.purevolume.com/RidingBikes/music
> 
> "Slow Descent" in the music section here:
> http://straylightrun.com/
> 
> XMMS reports:
> Distance: 6394 frames
> This Family Name: 9078 frames
> Slow Descent: 13535 frames
> 
> But MP3::Info reports:
> Distance: 68174 frames
> This Family Name: 96802 frames
> Slow Descent: 144313 frames
> 
> I'm using xmms version 1.2.10 and MP3::Info version 1.02.  Here's the code
> I'm using:
> 
> #!/usr/bin/perl
> use MP3::Info;
> my $mp3 = new MP3::Info $ARGV[0];
> print      "$ARGV[0] : framecount is "
>     . $mp3->frames
>     . ", fps is "
>     . sprintf("%.1f",($mp3->frames/$mp3->secs))
>     . "\n";
> 
> ...and in xmms, I'm just right-clicking on the track in the playlist and
> choosing "View File Info."  My goal is to get an accurate FPS for any given
> mp3, so that my script can resume playback of a paused track, by passing
> --skip <FPS*elapsedtime> to mpg321.
> 
> Can anyone shed any light on this?
> 
> Thanks,
> Anthony
> http://nodivisions.com/
> 
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