ffmpeg and two (2) logitech 920 webcams

[frankbelson2]

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

 

[Phillip Corcoran]

It could be a limitation of the FFmpeg software (ie doesn't support two cams simultaneously).

That's not a statement of a fact, just me saying it's possible based on nothing more than an educated guess.

 

[frankbelson2]

I considered that in regards to the two cams at once. However, the second cam (cam#2) will not show a preview at all. I just get the error. The cam DOES work with other webcam programs, so it is not the cam itself. Thank for the guess tho!!

Frank