Missing decoder plugin

[Nicolas Dufresne]

Le mardi 23 février 2021 à 19:52 -0600, Orko a écrit :
> Hello,
> 
> i try to use an ip camera as a webcam for my raspberry pi. there for
> installed v4l2loopback and tried 
> to stream the rtsp stream to /dev/video0  with the command 
> 
> gst-launch-1.0 rtspsrc location=rtsp://192.168.87.43/ ! decodebin ! v4l2sink
> device=/dev/video0
> 
> But i get the following error:
> 
> Setting pipeline to PAUSED ...
> libv4l2: error getting pixformat: Invalid argument
> 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
> Missing element: H.264 (Main Profile) decoder
> ERROR: from element /GstPipeline:pipeline0/GstDecodeBin:decodebin0: Your
> GStreamer installation is missing a plug-in.
> Additional debug info:
> gstdecodebin2.c(4592): gst_decode_bin_expose ():
> /GstPipeline:pipeline0/GstDecodeBin:decodebin0:
> no suitable plugins found:
> Missing decoder: H.264 (Main Profile) (video/x-h264,
> stream-format=(string)avc, alignment=(string)au,
> codec_data=(buffer)014d001fffe10013474d001f99a014016e8400000fa00000fa021001000
> 448ee3c80,
> level=(string)3.1, profile=(string)main)
> 
> Execution ended after 0:00:02.303332973
> Setting pipeline to PAUSED ...
> Setting pipeline to READY ...
> Setting pipeline to NULL ...
> Freeing pipeline ...
> 
> I'm not sure if the problem is really the missing plugin or this "libv4l2:
> error getting pixformat: Invalid argument" .
> The rtsp stream is working with vlc the codec is mpeg4 avc. 
> If i output to a fakesink i get the same decoding error but i have no clue
> on how to fix that.
> Maybe you guys have an idea of what i'm missing. 
> Anyway thank you in advance.

This error trace is from another project, you'd have to look inside of it to
figure-out what it means as clearly there is not enough information.

https://git.linuxtv.org/v4l-utils.git/

> 
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