No playable streams after streaming video using Gstreamer

[Mariem]

Hello,

I want to stream video using Gstreamer pipeline. I am using a c920 Logitech
which is plugged to my board(the board uses linux costumized release
provided by Yocto).

When I launch the first command
$gst-launch-1.0 -v --gst-debug=2 v4l2src device=/dev/video1 num-buffers=300
io-mode=dmabuf no-resurect-buf=true ! video/x-raw,format=NV12 ! omxh264enc
control-rate=2 target-bitrate=10485760 interval_intraframes=14
periodicty-idr=2 use-dmabuf=true !
video/x-h264,profile=\(string\)high,level=\(string\)4.2 ! h264parse !
video/x-h264,stream-format=avc,alignment=au ! qtmux ! queue ! filesink
location=output.mp4

Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
0:00:01.275238501  3220     0x12aaf4a0 WARN                 basesrc
gstbasesrc.c:2943:gst_base_src_loop:<v4l2src0> error: Internal data flow
error.
0:00:01.275306541  3220     0x12aaf4a0 WARN                 basesrc
gstbasesrc.c:2943:gst_base_src_loop:<v4l2src0> error: streaming task paused,
reason not-negotiated (-4)
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal
data flow error.
Additional debug info:
../../../../gstreamer-1.6.3/libs/gst/base/gstbasesrc.c(2943):
gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming task paused, reason not-negotiated (-4)
Execution ended after 0:00:00.035865024
Setting pipeline to PAUSED ...
/GstPipeline:pipeline0/GstQTMux:qtmux0.GstPad:src: caps =
"video/quicktime\,\ variant\=\(string\)apple"
Setting pipeline to READY ...
0:00:01.275863943  3220     0x12aaf4a0 WARN                   qtmux
gstqtmux.c:3364:gst_qt_mux_handle_buffer:<qtmux0> Failed to stop file:
flushing
Setting pipeline to NULL ...
Freeing pipeline ...

Then I tried the below command:
$gst-launch-1.0 -vvv uvch264src device=/dev/video1 num-buffers=300
io-mode=dmabuf no-resurect-buf=true ! video/x-raw,format=NV12 ! omxh264enc !
video/x-h264,profile=\(string\)high,level=\(string\)4.2 ! h264parse !
video/x-h264,stream-format=avc,alignment=au ! mp4mux ! queue ! filesink
location=output.mp4

The pipeline is created and I can stream a video. However, after stopping
the pipeline, I can not open the stream what I get is this file contains no
playable streams.

Could you help me please with my issue? 
I need one of the two commands to do the streaming.





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