Thanks your're right! Unfortunately it still doesnt work: ffmpeg -f alsa -i hw:0,0 -f lavfi -i nullsrc -filter_complex "[0]showwaves=split_channels=1:s=1280x720:mode=line:colors=Red|Blue" -c:v libx264 -preset fast -crf 23 -c:a copy http://localhost:5554/video.ffm
On Wed, 30 Jan 2019 at 09:45, Moritz Barsnick <barsn...@gmx.net> wrote: > On Tue, Jan 29, 2019 at 23:04:23 +0100, Zoltan Kerenyi Nagy wrote: > > Slight modification does not work either: > > > > ffmpeg -f lavfi -i nullsrc -f alsa -i hw:0,0 -filter_complex > > "[0:a]showwaves=s=1280x720:mode=line:colors=Blue[v]" -map "[v]" -map 0:a > > -c:v libx264 -r 15 http://localhost:5554/video.ffm > > > > error: > > > > Stream specifier ':a' in filtergraph description > > [0:a]showwaves=s=1280x720:mode=line:colors=Blue[v] matches no streams. > > This is why you should always show us the *complete* uncut console > output. You are hiding interesting info otherwise. > > Your first input (0) is nullsrc, a video source. So "[0:a]" does not > specify a valid stream. You are not even using nullsrc, so you should > probably omit "-f lavfi -i nullsrc", then the rest should work. > > Moritz > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".