[Bug 758219] uvch264src freezes when using its "vidsrc"

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758219

--- Comment #2 from Bence Varga <vbence at czentral.org> ---
I dist-upgraded the 2nd machine to Debian testing with kernel 4.2.

Linux 4.2.0-1-amd64
libusb-1.0-0
libusb-0.1-4 (I don't know when is this one used)
libgudev-1.0-0

This works fine:

gst-launch-1.0 -vvv -e uvch264src device=/dev/video0 name=src src.vfsrc !
video/x-raw,format=I420,width=1920,height=1080,framerate=24/1 ! queue !
vaapiencode_h264 rate-control=2 bitrate=3500 keyframe-period=50 tune=1 !
video/x-h264,profile=constrained-baseline ! mp4mux ! filesink location="a.mp4"

But adding vidsrc with a fakesink will produce a zero-length file. (This is a
headless machine, could not use the xvimagesink to test it).

gst-launch-1.0 -vvv -e uvch264src device=/dev/video0 name=src src.vfsrc !
video/x-raw,format=I420,width=1920,height=1080,framerate=24/1 ! queue !
vaapiencode_h264 rate-control=2 bitrate=3500 keyframe-period=50 tune=1 !
video/x-h264,profile=constrained-baseline ! mp4mux ! filesink location="a.mp4"
src.vidsrc ! queue !
video/x-h264,format=I420,width=1920,height=1080,framerate=24/1 ! h264parse !
fakesink

The first machine also has:
libusb-1.0-0
libusb-0.1-4
libgudev-1.0-0

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