Obscure error messages

[James]

I'm avoiding any reference to the rude rant a few days back.

I tried/tested lots before writing code which has worked somewhere (ubuntu 22.04 with gst 18 that stutters audio, SUSE tumbleweed gst 20..latest.)

All parcelled up and " Failed to allocate required memory" reared it's ugly head.

Either branch runs perfectly on it's own, starting the other fails.
I run one channel from my code. Take one of my tests

dvr at dvrTW:~> cat gst.try55
gst-launch-1.0 -v v4l2src device=/dev/video2 ! image/jpeg,framerate=30/1 \
	! jpegdec ! \
       videoconvert ! \
queue max-size-buffers=0 max-size-bytes=0 max-size-time=1000000000 ! \
gdkpixbufoverlay location=rennisons.png alpha=0.5 offset-x=1800 offset-y=900 ! \
clockoverlay halignment=left valignment=top draw-outline=true font-desc="Sans, 12" time-format="%d %b %Y %H:%M:%S" ! \
textoverlay text="This is Line 1"               deltay=50  halignment=left valignment=top font-desc="Sans, 10"                    draw-outline=true ! \
textoverlay text="Line 2"               deltay=100 halignment=left valignment=top font-desc="Sans, 10"                    draw-outline=true ! \
textoverlay text="Look it works" deltax=50 deltay=150 halignment=left valignment=top font-desc="Cantarell Oblique Medium 20" draw-outline=true ! \
textoverlay                             deltay=200 halignment=left valignment=top font-desc="Sans, 10"                    draw-outline=true ! \
textoverlay text="Line 5"               deltay=250 halignment=left valignment=top font-desc="Sans, 10"                    draw-outline=true ! \
textoverlay                             deltay=300 halignment=left valignment=top font-desc="Sans, 10"                    draw-outline=true ! \
textoverlay                             deltay=350 halignment=left valignment=top font-desc="Sans, 10"                    draw-outline=true ! \
textoverlay                             deltay=400 halignment=left valignment=top font-desc="Sans, 10"                    draw-outline=true ! \
textoverlay text="Why"                  deltay=450 halignment=left valignment=top font-desc="Sans, 10"                    draw-outline=true ! \
textoverlay text="Line 10"              deltay=500 halignment=left valignment=top font-desc="AdobeTimes Bold 10"          draw-outline=true ! \
       tee name=t \
	t. ! queue ! xvimagesink sync=false \
       t. ! queue ! \
	x264enc speed-preset=ultrafast tune=zerolatency byte-stream=true bitrate=4000 ! \
	mpegtsmux name=mux ! \
	filesink location='try55.mp4'


and run it

dvr at dvrTW:~> ./gst.try55
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0.GstPad:src: caps = image/jpeg, framerate=(fraction)30/1, width=(int)1920, height=(int)1080, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:5:1
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = image/jpeg, framerate=(fraction)30/1, width=(int)1920, height=(int)1080, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:5:1
/GstPipeline:pipeline0/GstJpegDec:jpegdec0.GstPad:sink: caps = image/jpeg, framerate=(fraction)30/1, width=(int)1920, height=(int)1080, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:5:1
/GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = image/jpeg, framerate=(fraction)30/1, width=(int)1920, height=(int)1080, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, colorimetry=(string)2:4:5:1
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Failed to allocate required memory.
Additional debug info:
../sys/v4l2/gstv4l2src.c(777): gst_v4l2src_decide_allocation (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Buffer pool activation failed
Execution ended after 0:00:00.005402443
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data stream error.
Setting pipeline to NULL ...
Additional debug info:
../libs/gst/base/gstbasesrc.c(3127): gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming stopped, reason not-negotiated (-4)
Freeing pipeline ...

Can anybody point me in a direction that solves it please.

I emphasize that somewhere during testing I had 4 channels all running, every channel runs it's own copy of gstreamer and AFAICT each copy is totally independant. We *must* be looking at some resource
This is running on i7x4 and htop shows 50% cpu and memory used.

The messing around with jpeg was a suggestion from Nicolas. Each capture card is USB3 in a USB3 port, but the system treated them as USB2 and limited resolution (1280x800 IIRC instead of 1080P)

James