longer audio stream after VBR or ABR with BeSweet

[hippoth]

If I encode my AC3 stream with BeSweet v1.11 and use ABR or VBR the audio streams are more than 15 minutes longer than the original audio...but why. With CBR it doesn´t happen.
I use the settings from the guide of doom9...
I don´t know whats wrong?!!

Sorry for the poor english.

[sibe]

I'm guessing you use WMP to see the lenght of your file. WMP doesn't display the length of VBR files correctly. Try another app like winamp an see if it's different now.

Sibe

[LigH]

When using variable bitrates for MP3 files, the very first MP3 audio block often is encoded with a lower bitrate because there is most probably silence. WMP does not know anything about VBR MP3, it always expects CBR - therefore it simply reads the bitrate of the first audio block and extrapolates the playing duration by this first bitrate over the filesize.

Better MP3 players can try to read a Xing VBR header (a non-audio block in the MP3 file) if available, which contains an overview of the bitrates for the whole file. If this header is not available, an application would need to scan through the whole MP3 file and collect all the bitrate data from all audio blocks, but this would take its time.