= ffplay multiple input files
{c}
TODO possible? https://superuser.com/questions/559768/ffplay-how-to-play-together-separate-video-and-audio-files
For synthesized streams like `sine` we can do it e.g.
``
ffplay -autoexit -nodisp -f lavfi -i '
sine=frequency=500[a];
sine=frequency=1000[b];
[a][b]amerge, atrim=end=2
'
``
but it does not seem to accept multiple `-i` for some reason. So is there a way to open a file from some filter? E.g.:
``
ffplay -i tmp.wav -i tmp.mkv -filter_complex "[0:a]atrim=end=2[a];[1:v]trim=end=2[v]" -map '[a]' -map '[v]'
``
fails with:
``
Argument 'tmp.mkv' provided as input filename, but 'tmp.wav' was already specified.
``