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Merging two y4m videos side-by-side:

Two combine 2 y4m videos into one with the two inputs displayed side-by-side, do:

<pre>
ffmpeg -i uncompressed.y4m -i decoded.y4m -filter_complex "[0:v]setpts=PTS-STARTPTS, pad=iw*2:ih[bg]; \
           [1:v]setpts=PTS-STARTPTS[fg]; [bg][fg]overlay=w" a_b_compare.y4m
</pre>

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