Am 27.03.20 um 04:06 schrieb Ted Park:
Hi,
for video: -vf setpts=0.5*PTS
for audio: -af atempo=2
Actually, he wanted to slow down the video so you probably meant the reciprocal
of this, 2*PTS and atempo 1/2
Thanks alot, this works fine.
Now I want to tweak a little bit more. I want to slow down the video by 1.4 and
then increase the audio frequency by 1.25. So I did:
ffmpeg -i in.mp4 -vf setpts=PTS*1.4 -af asetrate=48000*1.25,atempo=1/1.25/1.4
out.mp4
This resulted in really bad audio quality. The reason is maybe, that the
sampling rate of the output was transformed to 64.000, but I want 48.000. I
guess there is a possibility to get a better result by using -af aresample, but
I have problems to understand it's syntax.
Can one please give me a hint for my purpose?
-Ulf
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