[Bug 756776] New: uvch264src does capture H264 stream from Logitech C920, works with v4l2src

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=756776

            Bug ID: 756776
           Summary: uvch264src does capture H264 stream from Logitech
                    C920, works with v4l2src
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mail at colinfinck.de
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I have been trying out this example pipeline from
http://www.oz9aec.net/index.php/gstreamer/487 with my Logitech C920 webcam to
capture its H264 stream:

gst-launch-1.0 -v -e uvch264src device=/dev/video1 name=src auto-start=true \
src.vfsrc ! queue !
video/x-raw,format=\(string\)YUY2,width=320,height=240,framerate=10/1 !
xvimagesink sync=false \
src.vidsrc ! queue ! video/x-h264,width=1280,height=720,framerate=30/1 !
h264parse ! avdec_h264 ! xvimagesink sync=false

Unfortunately, this only opens a window for vfsrc showing a single still image
(but no video!)
No window at all opens for the vidsrc.

Several modifications of the pipeline have been tried, like connecting vfsrc to
a fakesink and transmitting vidsrc in a stream over the network. But still no
data is transferred in this case.
Apparently, GStreamer 1.x is unable to capture the H264 stream from the C920
webcam.

I have tested multiple versions of GStreamer 1.x and none of these works:
* GStreamer 1.2.3-1 package from Ubuntu 14.04 LTS
* Backported GStreamer 1.4.3 package for Ubuntu 14.04 LTS from
https://launchpad.net/~ddalex
* GStreamer 1.4.4 package from Debian Jessie

I have also tested it on different computers and with different Logitech C920
webcams.

Using v4l2src instead of uvch264src in these GStreamer 1.x versions works
though and properly captures the H264 stream from the webcam.
I need the additional parameters of uvch264src though (like bitrate setting),
so this is not a viable solution for me.

What also works is a self-compiled GStreamer 0.10.x from GIT with the pipeline
modified to use "uvch264_src" instead of "uvch264src". I don't want to rely on
3-year-old versions though..

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