can't play h264 over RTP

[i.nixman at autistici.org]

hello guys,

in the end I can see the video stream on QGroundControl app using this 
pipeline:
gst-launch-1.0 -v \
v4l2src device=/dev/video15 \
! video/x-raw,width=320,height=240,format=NV12 \
! v4l2h264enc \
! h264parse \
! rtph264pay name=pay0 pt=96 config-interval=1 \
! udpsink host=192.168.2.253 port=8644


but the problem is that if first start QGroundControl and then streaming 
- the video is displayed as it should.

but if first start streaming and then QGroundControl - QGroundControl 
does not display video and I see the following errors in the log:

GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
3876 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
3879 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
4192 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
5350 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
3840 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
5244 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
12059 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
5053 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
5235 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
6013 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
3918 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
4076 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
4256 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
4596 will be dropped
GStreamerAPILog: <h264parse0> broken/invalid nal Type: 1 Slice, Size: 
4052 will be dropped


any ideas?



best!