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Forum Problem with PYNZ-Z2 and HDMI output from camera
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  • pynq z2
  • hdmi
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Problem with PYNZ-Z2 and HDMI output from camera

Fred27
Fred27 over 5 years ago

I'm currently making sure I'm in a good position to hit the ground running with the upcoming PYNQ-Z2 workshops. I bought the recommended kit including an Apeman A77 camera and thought I'd just have a quick poke around in advance. I ran through the "getting started" and the Pynq 2.5 image includes some simple HDMI examples. (I hope I'm not jumping too far ahead, but like to be prepared.)

 

Anyway, as I start to run the HDMI example I get a kernel died error (as shown). You can see on screen what's been run. This is just wiring HDMI out to show what's on HDMI in. The error is completely repeatable. Nothing noteworthy in /var/log/jupyter.log to give any clue.

image

 

As quick Google suggested that maybe the image is too high resolution, and when I checked the camera on my TV it outputs 1080p at 60fps regardless of the resolution of video being captured. Could 1080p be too much?  Time to switch to a Raspberry Pi 4 where I can change resolution properly. The above example ran quite happily with the Pi at a lower resolution, but surprised me when it also ran using the Pi at 1920x1080 at 60fps too.

 

Is this camera (Apeman A77) compatible with the HDMI on the PYNQ-Z2? I'd have expected it to be as it was the recommended kit and the Crosstour one listed now is essentially the same model.

 

I'll try to do more digging into any subtle differences between the HDMI output of the Pi and the camera, but all I have is a TV that shows some info on the input. Anyone else have any ideas?

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  • beacon_dave
    beacon_dave over 5 years ago +3 suggested
    Are you aware that the HDMI out IP provided in the PYNQ-Z2 the base overlay doesn't fully support 1080p video ? https://pynq.readthedocs.io/en/v2.5.1/pynq_overlays/pynqz2/pynqz2_base_overlay.html#hdmi…
  • Fred27
    Fred27 over 5 years ago +3
    Thanks for all your help beacon_dave My TV reports that the Pi and the camera are outputting the same format - 1080p60, sYCC601 colourspace, 8-bit depth, and YCbCr 4:2:2 pixel format. I tried connecting…
  • Fred27
    Fred27 over 5 years ago in reply to beacon_dave +2 suggested
    I wasn't aware of those details. Maybe that's it - a borderline implementation of 1080p where output from the Pi 4 works and the camera doesn't. If that's the case it's frustrating that a recommended camera…
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  • Fred27
    0 Fred27 over 5 years ago

    Thanks for all your help beacon_dave

     

    My TV reports that the Pi and the camera are outputting the same format - 1080p60, sYCC601 colourspace, 8-bit depth, and YCbCr 4:2:2 pixel format. I tried connecting the Pi and then swapping out for the camera, and the image is garbled. That seems to suggest it isn't the same format, despite what my TV says.

     

    It's also on the first line of the second code cell - hdmi_in.configure() - that it fails, so we haven't even got to creating or configuring the HDMI out at that point. Something about the input is causing the problem.

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  • beacon_dave
    0 beacon_dave over 5 years ago in reply to Fred27

    Have you got a PYNQ 2.4 image to hand that you can try it with to see if it makes any difference ?

     

    I've got an older Apeman A66 1080P camera on order so will be interesting to see how that behaves, but it isn't due to arrive until the end of next week.

     

    Amongst other things, I am quite interested in using the PYNQ-Z2 as a test instrument to verify what EDID information HDMI sinks are outputting and what resolutions HDMI sources are outputting.

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  • Fred27
    0 Fred27 over 5 years ago in reply to beacon_dave

    beacon_dave  wrote:

    Have you got a PYNQ 2.4 image to hand that you can try it with to see if it makes any difference ?

    Just tried Pynq 2.4. Same as 2.5.

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  • beacon_dave
    0 beacon_dave over 5 years ago in reply to Fred27

    Can you disable the embedded audio on the A77 camera ?

    May be worth a try if you can.

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  • beacon_dave
    0 beacon_dave over 5 years ago in reply to Fred27

    Can you disable the embedded audio on the A77 camera ?

    May be worth a try if you can.

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