[FFmpeg-user] Video with copyright

Tom Evans tevans.uk at googlemail.com
Wed Jun 4 13:24:34 CEST 2014

On Wed, Jun 4, 2014 at 11:56 AM, Massimo Battistel
<battistel at gmail.com> > Let's start with a working command line
(ffmpeg uses 14MB to process file):
> ffmpeg -i sample.mp4 -vn -acodec pcm_s16le -ac 2 -f asf - > nul
> No problems with this one, but if I add "-async 1000" like the following:
> ffmpeg -i sample.mp4 -vn -acodec pcm_s16le -ac 2 -async 1000 -f asf - > nul
> I got DTS errors

Don't do that then!

> and ffmpeg memory grows up to 1GB.

‘-async samples_per_second’

Audio sync method. "Stretches/squeezes" the audio stream to match the
timestamps, the parameter is the maximum samples per second by which
the audio is changed. -async 1 is a special case where only the start
of the audio stream is corrected without any later correction.

Asking ffmpeg to keep track of 1000 samples will increase the memory
ffmpeg consumes.



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