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Old 11th December 2020, 09:50   #3  |  Link
Selur
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Join Date: Oct 2001
Location: Germany
Posts: 7,259
If your source is video only I agree with Junkus.

Assuming that your input is not video only:
My guess is that your aim was to process the video using Vapoursynth and process the audio through ffmpeg.
Problem with you call is that you have two inputs, but you are not providing a mapping to what ffmpeg should do with the content. And you are also not specifying what should happen with the audio (so ffmpeg will use some default audio reencoding settings, which is probably not what you want.)
Thus FFmpeg probably simply only processes the second input and ignores the first.
-> you might want to read up on ffmpeg and mapping (https://trac.ffmpeg.org/wiki/Map) and ffmpeg and audio handling (https://trac.ffmpeg.org/wiki/Encode/HighQualityAudio).

Cu Selur
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