Why is videobox/videomixer dropping frames?

[wally_bkg]

Josh Doe wrote:
> 
> You definitely need to insert queue's between the v4l2src's and the
> videomixer.
> -Josh
> 

Doing so made it worse, much worse.

gst-launch v4l2src device=/dev/video5 ! ffmpegcolorspace ! \
video/x-raw-yuv,format=\(fourcc\)AYUV,width=640,height=480 ! \
videobox border-alpha=0 top=-480 bottom=-48 ! queue ! \
videomixer name=mix sink_0::alpha=1.0 sink_1::alpha=1.0 ! \
ffmpegcolorspace ! xvimagesink  v4l2src device=/dev/video4 !
ffmpegcolorspace ! \
video/x-raw-yuv,format=\(fourcc\)AYUV,width=640,height=480 !
ffmpegcolorspace ! queue ! mix.

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