[FFmpeg-user] Use multiple lavfi input generators
elliottbalsley at gmail.com
Tue Jul 24 00:02:43 EEST 2018
I’m having trouble figuring out the syntax for this. I want to generate a test file using video testsrc and audio sine wave. I can do both separately, but how can I get both together?
ffplay -f lavfi -i testsrc=s=1920x1080 (this works)
ffplay -f lavfi -i sine=frequency=800 (this works)
ffplay -f lavfi -i testsrc=s=1920x1080 -i sine=frequency=800
Argument 'sine=frequency=800' provided as input filename, but 'testsrc=s=1920x1080' was already specified.
ffplay -f lavfi -i testsrc=s=1920x1080,sine=frequency=800
[lavfi @ 0x7faf0e821400] Too many inputs specified for the "sine" filter.
testsrc=s=1920x1080,sine=frequency=800: Invalid argument
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