[FFmpeg-devel] One pass volume normalization (ebur128)

Jan Ehrhardt phpdev at ehrhardt.nl
Tue Jul 16 16:29:14 CEST 2013

Nicolas George in gmane.comp.video.ffmpeg.devel (Tue, 16 Jul 2013
15:36:31 +0200):
>It seems to me this is a sign of a crappy (or badly configured) operating
>system, but it is completely unrelated to the problem at hand since there is
>absolutely nothing to write in any permanent file until the final phase.

It might be a crappy OS (Windows), which cannot be configured better.
But it perfectly explains the speed decrease (from 17 to 27 seconds)
when the only thing you do is turn FFMpeg's logging on. Every program
that does not buffer its output by itself suffers from the same problem.
I already mentioned qt-faststart. MP4Box was another one (until the
creators solved it on my request):

The same happens with writing a logfile to a SD card bij FFMpeg.


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