v4l2rc MJPEG to Videomixer slow - alternative pathways?

[Nicolas Dufresne]

Le jeudi 28 septembre 2017 à 16:45 -0700, ashwath a écrit :
> I'm sorry, just 1 more update.  Adding a leaky queue after the
> capture helped
> get rid of the lost frames problem, but the feed is still quite laggy
> (not
> to mention I'm also losing lots of frames).  I see a lot of gstreamer
> warnings: 
> 
> 
> 0:00:06.013149788 15050       0x9250a0 WARN            videodecoder
> gstvideodecoder.c:4003:_gst_video_decoder_error:<jpegdec2> error:
> Failed to
> decode JPEG image
> 0:00:06.013162819 15050       0x9250a0 WARN            videodecoder
> gstvideodecoder.c:4005:_gst_video_decoder_error:<jpegdec2> error:
> Decode
> error #62: Unsupported JPEG process: SOF type 0xcf
> 
> 
> new pipeline:
> 
>  gst-launch-1.0 videomixer name=mix sink_0::xpos=0 sink_0::ypos=0

Replace with videomixer with compositor, and configure latency property
to something large enough (experiment to find the good value for your
use case). The leaky queues won't be required anymore since compositor
has it's own queue mechanism. Make sure so add downstream caps,
compositor will produce a perfect framerate from the detected framerate
in that filter.

> sink_1::xpos=640 sink_1::ypos=0 sink_2::xpos=0 sink_2::ypos=480
> sink_3::xpos=640 sink_3::ypos=480  ! autovideosink sync=false v4l2src
> device=/dev/video0 do-timestamp=false !
> image/jpeg,height=480,width=640,framerate=30/1 ! queue leaky=2
> max-size-buffers=1 !  jpegparse ! jpegdec ! videoconvert ! mix.sink_0
> v4l2src device=/dev/video1 do-timestamp=false !
> image/jpeg,height=480,width=640,framerate=30/1 ! queue leaky=2
> max-size-buffers=1 !  jpegparse ! jpegdec ! videoconvert ! mix.sink_1
> v4l2src device=/dev/video2 do-timestamp=false !
> image/jpeg,height=480,width=640,framerate=30/1 ! queue leaky=2
> max-size-buffers=1 !  jpegparse ! jpegdec ! videoconvert ! mix.sink_2
> v4l2src device=/dev/video3 do-timestamp=false !
> image/jpeg,height=480,width=640,framerate=30/1 ! queue leaky=2
> max-size-buffers=1 ! jpegparse ! jpegdec !  videoconvert ! mix.sink_3
> 
> 
> 
> 
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