Quote:
Originally Posted by Amarena21
...and also useac3to gui hoping that maybe using with these other tools the length would remain unchanged but it doesn't.
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The reasons are explained by sneaker_ger.
With AC3 48 KHz only 5,33 ms (256 silence samples added at the beginning) of delay are added each time you encode (the final silence added is not important for sync).
If you want minimize that delay you can use UsEac3to to encode with Output format ac3-ffm and add:
stdout.w64
-5ms | ffmpeg -i - -c:a ac3 -b:a 640k -center_mixlev 0.707 %_.ac3
BTW if you want time stretching the duration is also changed and the precision is not exact always.