[FFmpeg-user] generating silent audio streams simultaneous with lavfi / generated video

Carl Eugen Hoyos cehoyos at ag.or.at
Wed Jul 1 08:45:47 CEST 2015

James Heliker <james.heliker <at> gmail.com> writes:

> C:\ffmpeg.exe -f lavfi -i color=c=black:s=1920x1080 
> -frames:v 10 

> -r 29.97

The color filter has a rate option.

> However that results in a file with only video 
> stream - no audio.

You failed to provide an input audio stream to 
ffmpeg, I usually use:
ffmpeg -f s16le -i /dev/zero
The anullsrc filter should work fine on Windows.

Carl Eugen

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