[FFmpeg-user] How to set video size when using -f dshow?
rogerdpack2 at gmail.com
Thu Aug 25 01:26:55 CEST 2011
> When running the command line below, I get "Option video_size not found."
> I've tried -video_size hd720, with no effect.
> How do you set the video size when using dshow? Thanks for any help you can
> ffmpeg -rtbufsize 100000000 -f dshow -s hd720 -i video="Microsoft LifeCam
> Cinema" -vframes 1 test%06d.tif
You can't yet it's not implemented, I believe (just looking at it, I
think maybe it's using DirectConnect to connect the pins, which just
always choose some default).
My current work around is to (are you ready for this?) create a
graphviz file with one box as your LifeCam, then add a "Tee" box and
connect the two. Then right click on your output pin coming from the
LifeCam, and set the resolution. Save the graphviz file.
Now create an avisynth file like:
DirectShowSource("tee.grf", fps=2.0, audio=False, framecount=1000000)
Then use ffmpeg on that file as input. (you have to install avisynth
as well, obviously).
I'd be willing to offer a bounty for somebody to implement it so that
you can select the size and the fps though, that would be sweet and
avoid this work around.
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