Template:Merging two y4m videos side-by-side

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To combine 2 y4m videos into a single video with the input videos displayed side-by-side, do: 

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
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