Can I play a playlist of rear and front dashcam videos in MPV?

I'm trying to play both front and rear footage from my dashcam at the same time as a playlist in mpv. Front and rear video files are in F and R directories. I can easily add all files from e.g. F directory to the playlist: mpv F/* I can also run a picture-in-picture overlay for a single pair of front/rear footage: mpv $front_video --external-file=$rear_video --lavfi-complex='[vid2] scale=640x360 [small]; [vid1] [small] overlay [vo]' I'm having trouble combining both, i.e. I want a playlist of picture-in-picture overlays. The issue is I always get the rear view from the first video: mpv \ REC_200607-175943F.MOV --external-file=../R/REC_200607-175943R.MOV --lavfi-complex='[vid2] scale=640x360 [small]; [vid1] [small] overlay [vo]' \ GSR_200607-180444F.MOV --external-file=../R/GSR_200607-180444R.MOV --lavfi-complex='[vid2] scale=640x360 [small]; [vid1] [small] overlay [vo]' \ GSR_200607-180943F.MOV --external-file=../R/GSR_200607-180943R.MOV --lavfi-complex='[vid2] scale=640x360 [small]; [vid1] [small] overlay [vo]' 1st overlay, all fine: 2nd overlay, plays rear view from the 1st one: For now I'm using a script that runs mpv for the next pair of videos as soon as the first one quits so I can watch all of them from start to finish but I miss the features like jumping to previous/next video, checking where in the playlist I am, setting a playback speed, volume, contrast, etc. Also, it's cumbersome to stop in the middle of playback because quitting one mpv instance runs the next one: #!/bin/sh for front in $(ls -tr); do rear=../R/${front/F./R.} mpv $front --external-file=$rear --lavfi-complex='[vid2] scale=640x360 [small]; [vid1] [small] overlay [vo]' done Any suggestions?