error: Cannot find plane

[SupremeJulyan]

When I first execute run.sh,the output is:
[h264_v4l2m2m @ 0x1b16be20] Could not find a valid device
[h264_v4l2m2m @ 0x1b16be20] can't configure decoder
1604472023:00728678 :error: Could not open codec

And then I changed the decoder:h264,the output is:

1604471950:00018876 : ffmpeg-drm: drm: connector: connected
1604471950:00019070 : ffmpeg-drm: available connector(s)
1604471950:00019089 : ffmpeg-drm: connector id:47
1604471950:00019099 : ffmpeg-drm: encoder id:46 crtc id:45 fb id:0
1604471950:00019110 : ffmpeg-drm: width:3840 height:2160
1604471950:00019136 :drm: found planes 3
1604471950:00019187 :error: Cannot find plane
1604471950:00019242 :error: Error initializing drm

How could I solve it?

[SupremeJulyan]

I tried it on AllWinner H6 platform,can you give me some advice?

[wasalm]

Having the same issue on Raspberry Pi 4.
For me the issue is that it needs to find a plane supporting pixel format 2795939494 (= 0xA6A6A6 = '||||').
I have no idea how to solve this issue.