Putting together a complex gstreamer command line...

[Robin A. Jensen]

Sorry to say but compositor1.4.4 is A BadPlugin in Gst-1.0.
And also is glvideomixer while videomixer is  Good-Plugin.
Did not have any luck with compositor and glvideomixer creates dark 
pictures.
I did not use glupload but glimagesink and it seemed to used a bit more 
CPU than videomixer.

Robin.

Den 03-04-2016 kl. 16:07 skrev Nicolas Dufresne:
> As a first step, you should replace videomixer with compositor. The
> compositor element have the same interface but works with live sources
> correctly, and implement color conversion internally. Note that this is
> all done in software and will quickly max out the CPU capacity.
>
> As you want to apply GL shaders, best is to upload everything to GL in
> the first place. This can be done using glupload and glcolorconvert
> elements. The equivalent in GL to compositor is glvideomixer. You
> should use fairly recent version of GStreamer (something Raspbian might
> not offer). Not everything is supported in term of GL feature on this
> platform.
>
> Another point I'd like to bring, is that the v4l2 driver on RPI has
> never been fantastic. I don't know if anyone have worked on it since,
> but some people get better resulting using rpicamsrc, https://github.co
> m/thaytan/gst-rpicamsrc
>
> Nicolas
>
> Le dimanche 03 avril 2016 à 05:30 -0700, nicko a écrit :
>> For the sake of completeness, here is the question - I would really
>> appreciate help on this as I'm completely stuck:
>>
>> I have a Raspberry Pi Compute Module with 2 cameras. I'm trying to
>> use
>> gstreamer with v4l2src selecting /dev/video0 & /dev/video1 to
>> continually
>> run at about 20FPS and use videomixer to combine the images side-by-
>> side
>> then output H.264 over RTP to a UDP port (read by another host).
>> Somewhere
>> in the comand line, I'm going to need to include glshader to apply
>> some
>> distortion to each image before the merge...
>>
>> The default (current) RPi v4l2src driver does not support two
>> cameras, but
>> as of today a beta is available that does, however it requires the
>> beta
>> 4.4.6 kernel.
>>
>> The problem I'm having is in getting the mixer connected.
>>
>> #!/bin/bash -x
>> #
>> # Script to start RPi Compute Module streaming over RTP (RFC3984)
>> # from both cameras
>> #
>> FPS=20                          # Frames per second
>> WIDTH=640                       # Image width
>> HEIGHT=480                      # Image height
>> UPLINK_HOST=192.168.1.73        # Receiving host
>> PORT=5200                       # UDP port
>> #
>> # TESTING WITH ONE CAMERA ONLY FOR THE MOMENT
>> #
>> function start_streaming
>> {
>>    gst-launch-1.0 -ve videomixer name=mixer  \
>>    ! x264enc \
>>    ! h264parse \
>>    ! rtph264pay config-interval=10 pt=96 \
>>    ! udpsink host=$UPLINK_HOST port=$PORT \
>>    v4l2src device=/dev/video0 \
>>    ! video/x-
>> raw,format=AYUV,width=$WIDTH,height=$HEIGHT,framerate=$FPS/1 \
>>    ! mixer.
>> }
>>
>> # Start streaming on both cameras simultaneously
>> echo Image size: $WIDTH x $HEIGHT
>> echo Frame rate: $FPS
>> echo Starting cameras 0 and 1 streaming to $UPLINK_HOST:$PORT
>> start_streaming
>>
>> # Wait until everything has finished
>> wait
>>
>> exit 0
>> # end
>>
>> What I'm getting is the rather useless (to me) message:
>>
>> WARNING: erroneous pipeline: could not link v4l2src0 to mixer
>>
>> I've fiddled about rather a lot and got nowhere - it's probably
>> something
>> trivial, but be blowed if I can see it !
>>
>> Many thanks
>>
>> Nick
>>
>>
>>
>>
>> --
>> View this message in context: http://gstreamer-devel.966125.n4.nabble
>> .com/Putting-together-a-complex-gstreamer-command-line-
>> tp4676713p4676714.html
>> Sent from the GStreamer-devel mailing list archive at Nabble.com.
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