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the desired output is combining 3 vids, and using scale or pad (do some processing on the input).
ffmpeg -i in.mp4 -i in2.mkv -i in3.mkv \
-filter_complex "[0:v][v0];[1:v]scale=-1:1440[v1];[2:v][v2],[v0][v1][v2]hstack=inputs=3"
-map "[v]" -map 1:a output.mp4
give:
[AVFilterGraph @ 0xec0a80] No such filter: '' Error initializing complex filters. Invalid argument
[0:v][v0] and [2:v][v2] don't contain any filter declaration, and thus ffmpeg complains. Insert whichever filter is desired in between the input and output pads.
I suppose you meant to scale the heights of the 3 inputs to match. In which case,
ffmpeg -i in.mp4 -i in2.mkv -i in3.mkv \ -filter_complex "[0:v]scale=-1:1440[v0];[1:v]scale=-1:1440[v1];[2:v]scale=-1:1440[v2];[v0][v1][v2]hstack=inputs=3" -map "[v]" -map 1:a output.mp4
on input processing with -filter_complex, you use this pattern:
[input_number:v]operation[tmp_output_name]
[0:v][v0];and[2:v][v2],meant to do? – Gyan Nov 29 '20 at 5:28