Obscure error messages

[James]

> On 4 Jan 2023, at 7:29 am, Nicolas Dufresne via gstreamer-devel <gstreamer-devel at lists.freedesktop.org> wrote:
> 
> Any chance you could share a trace with env GST_DEBUG="*v4l*:7,2" ?
> 
> Le mar. 3 janv. 2023, 10 h 46, James via gstreamer-devel <gstreamer-devel at lists.freedesktop.org <mailto:gstreamer-devel at lists.freedesktop.org>> a écrit :
> 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)
> 
> If it was still a lack of bandwidth, UVC driver should be messaging you through dmesg. 

I'll revert and look but the crux is solved!

The jpeg fiddle was your suggestion to get 1080 on a usb-3 port. The error message was caused by having 2 capture cards on (a hub) a single usb-3 port even though that is quite legal (in terms of bandwidth).
I will also try 2 cards on a usb-c.
Then to find the culprit gstreamer or UVC driver.

My m2 adapter is S-L-O-W but on a standard flash disk I can hold 500Mb/s on the usb-3 port.
Someone pretends the usb-3 is a usb-2: who?

James


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