Am 05.05.2020 um 13:21 schrieb Ulf Zibis:
Am 04.05.2020 um 12:56 schrieb Michael Koch:
Am 04.05.2020 um 11:00 schrieb Ulf Zibis:
>//>/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. /
try -af aresample=48000
Do you mean, I should add this at the end of my filter chain? I can't
imagine, that using it singular instead would do what I want.
yes, add it at the end of the filter chain.
Michael
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