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This command line work for me: ffplay -f dshow -video_size 720x480 -framerate 29.97 -i video="Conexant Polaris Video Capture":audio="Conexant Polaris Video Capture" before testing any command line, identify the name of your capture card in the operating system with the line below: ffmpeg -list_devices true -f dshow -i dummy after that, ...

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