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I'm currently working on some multi-channel audio recording software. The basic goal is to be able to record every input device on a computer. I noticed that when I record for a "long" time (more than 1 hour), the different mp3 files (which represent the different input devices) have the same length (and bitrate settings), but the filesize is not the same (although it's not a huge difference, about 10 KB at most). I would expect that the files must have the exact same size, though I'm not 100% sure of it. Are there any audio experts here on Stack Overflow with some advice?

Bram W.
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How do you measure the length of files? 10KB of filesize difference at the bitrate of 320kbps is about one quarter of a second, so it is the expected behavior if your length measurements have the precision of 1 second.

penartur
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  • Indeed you're right. I checked the files with the MediaInfo tool, and there was a difference of a few milliseconds. – Bram W. Apr 25 '12 at 08:26