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I am attempting to playback 3 x dshow devices (Logi Brio webcams) with the hstack filter. I can successfully playback local .mp4 files with the following command, but I'm struggling to bring the dshow devices into the mix.

Working code w/ local .mp4 videos:

ffplay -f lavfi "movie=video1.mp4[v0];movie=video2.mp4[v1];movie=video3.mp4[v2];[v0][v1][v2]hstack=inputs=3"

Error when attempting to connect to the dshow device via

ffplay -f lavfi "movie='Logitech BRIO':f=dshow":

nan : 0.000 fd= 0 aq= 0KB vq= 0KB sq= 0B f=0/0
[dshow @ 0000000000000000] Malformed dshow input string. [Parsed_movie_0 @ 0000000000000000] Failed to avformat_open_input 'Logitech BRIO' [lavfi @ 0000000000000000] Error initializing filter 'movie' with args 'Logitech BRIO:f=dshow' movie='Logitech BRIO':f=dshow: I/O error

Same result with the 'Alternative name' for the BRIO. I'm just after a way to preview 3 x dshow devices stacked together with the hstack filter via ffplay and lavfi. Any help would be greatly appreciated!

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This seems to work for me:

ffplay -f lavfi "movie='video\=WebCam SC-0311139N':f=dshow"

Escaping the = is crucial.

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