Missing decoder plugin

[Orko]

Hello and thank you for your help.

I installed the missing lidav and omx and with:
gst-launch-1.0 rtspsrc location=rtsp://192.168.87.43/ ! decodebin !
autovideosink
i can see the video stream in a window.

But when i try:
gst-launch-1.0 rtspsrc location=rtsp://192.168.87.43/ ! decodebin ! v4l2sink
device=/dev/video0

I get:
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Progress: (open) Opening Stream
Progress: (connect) Connecting to rtsp://192.168.87.43/
Progress: (open) Retrieving server options
Progress: (open) Retrieving media info
Progress: (request) SETUP stream 0
Progress: (open) Opened Stream
Setting pipeline to PLAYING ...
New clock: GstSystemClock
Progress: (request) Sending PLAY request
Progress: (request) Sending PLAY request
Progress: (request) Sent PLAY request
ERROR: from element
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0:
Internal data stream error.
Additional debug info:
gstomxvideodec.c(1599): gst_omx_video_dec_loop ():
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0:
stream stopped, reason not-negotiated
Execution ended after 0:00:02.445128941
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

so i think we are getting closer but i do not understand why decodebin now
throws an error. 
I thought every element of the pipeline is kinda working separately.?  
 




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