[FFmpeg-user] Stream specifier ':a' in filtergraph Error

Randy Johnson randy.johnson at hey.com
Tue Nov 10 23:27:03 EET 2020


When running the following command:

ffmpeg \
-loop 1 -framerate 30 -t 1.4 -i /assets/img/filler640480.jpg -i 0d.mp4 -
y \
-loop 1 -framerate 30 -t 891.113 -i /assets/img/filler640480.jpg -i
9f.mp4 -y \
-f lavfi -t 0.1 -i anullsrc=channel_layout=mono:sample_rate=48000 \
-filter_complex "
-vsync 2 -vcodec libx264 -pix_fmt yuv420p 0245-grid.mp4


I am getting the following error:

Stream specifier ':a' in filtergraph description 
matches no streams.

This only happens on some video processing not all, cannot seem to
figure out why.

Thank You,


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