MP3 VBR or ABR not synch when outside the avi

[LordIntruder]

Hi.


I would like to know why VBR files are not time correctly displayed when we used WMP or any other player?

I mean if I encode a movie of 02h00, a audio file encoded in VBR or ABR will always be shorter in time. Maybe 01h45. On the contrary a CBR file will always display the correct time so in this example: 02h00.

Of course, when I mux the audio with the video, the audio is perfectly synchronised with the video. I really don't understand why? Any info would be much welcome.

I ask this question because I need for my personal use to let the audio outside the video. The problem is if I load the video (using BSPlayer) and I open the audio stream, everything is desynch if I use VBR or ABR. CBR is ok, no problem.

I've seen no option in Lame that would help. Here the commands I use:

lame -b 96 -m j -h --resample 48 -q 0 input.wav output.mp3


Thanks for any info. :)

[LordIntruder]

Oh and by the way, I use LAME V3.93.1.

[alexnoe]

BSPlayer doesn't support external audio files with non-CBR

[dhv]

Yes, you should use CBR mp3 for external audio track.
WMP doesn't display time correctly, because it not fully support VBR. Winamp will display correct lenght. But for video + ext. audio you must use CBR, because most players use WMP directshow graph.

[LordIntruder]

Ah ok. It's as simply as that. Well! :)

Thanks for replies, much appreciated. :D