what is the output of $ ffmpeg -list_devices true -f dshow -i dummy
if you have multiple entries of a webcam named "Logitech Cam", you can specify which using -video_device_number the following would select the 2nd identical device (as numbers for devices start at 0) $ ffmpeg -f dshow -video_device_number 1 -i video="Logitech Cam" im also curious.. would this work? video="Logitech Cam#0" (please include complete uncut console output) running the latest version of ffmpeg? > On May 19, 2018, at 3:34 17PM, Brenda Spinner <brendaspin...@gmail.com> wrote: > > I am using the following line to preview my webcam: > > ffmpeg -s 1280x720 -framerate 30 -pix_fmt yuv420p -rtbufsize 100MB -f dshow > -i video="Logitech Cam#1" -c:v copy -an -f sdl "WebCAM Preview" > > this line works fine with cam #1, however when try it with cam #2, I get > the error: > > [dshow @ 00000000002d8920] Could not set video options video=Logitech > Cam#2: I/O error > > Can anyone tell me why this is happening. I would like to able to preview > both webcams at the same time? > > Thanks, Frank > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> > Virus-free. > www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".