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[mattkhan]

as per https://yabb.jriver.com/interact/index.php/topic,135621.msg952870.html#msg952870

any clues in the attached log?

[Hendrik]

Well it is failing on something

Code: [Select]

0007360: 140059508000448: Playback: CJRVideoRendererCore::Thread: Resized swapchain to 246x138, refresh: 60, sync interval: 166659
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Polar radius 49.518837 exceeds implementation capacity!
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Failed dispatching scaler.. disabling
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Attempting to modify a failed shader!
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Attempting to modify a failed shader!
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Failed creating HDR peak detection shader.. disabling
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Attempting to modify a failed shader!
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Attempting to modify a failed shader!
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Attempting to modify a failed shader!
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Dithering to 8 bit depth
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Trying to dispatch a failed shader.
0007526: 140059508000448: Playback: CJRVideoRendererCore::PLLog: Failed rendering image!
0007526: 140059508000448: Playback: CJRVideoRendererCore::Render: Rendering Frame failed

From the error, I'm guessing you are using a polar downscaler (Jinc), and its failing on a too extreme downscaling factor 3840x2160 -> 246x138 (action window?)
I have not seen that error myself, but I'll investigate.

Maybe try an ortho downscaler? (literally any other then Jinc)

If its what I think it is, I might have to swap downscaling algorithm to something else on extreme downscaling ratios. But other then Action Window, there is no reasonable expectation of such high downscaling going on.

Edit:
Oh I realized why I havent seen this error. On newer GPUs Jinc uses Compute Shaders which has different limits.

[mattkhan]

It did open directly into the overview screen, I will get a new log with it going direct to display view to see if that changes anything

[mattkhan]

in fact it does if it opens into a larger window, log attached

for some reason I can't fathom, this MC instance doesn't open display view automatically. I can't find a config option for that either

anyway I guess it's a rather obscure bug, if playback starts in a too small window then HDR peak detection is borked.

[JimH]

Should be set in Options > General > Behavior.

[mattkhan]

"Jump on play (Video)" is set to display view

I think the issue here is that this test clip is not in the library and "File > Open Media File" is ignoring that option whereas playing a library item does respect it

[mattkhan]

actually I'm wrong, you have to use "Display view (even in playing now)" and then it works. I don't understand why there are 2 options for what seems like same behaviour mind you

[Hendrik]

anyway I guess it's a rather obscure bug, if playback starts in a too small window then HDR peak detection is borked.

I'll fix it by swapping out the scaling algorithm for downscaling on factors below 1/8th or something, which should be close to its limit.
You could confirm this by swapping downscaling to Lanczos or literally anything thats not Jinc.

[mattkhan]

yes that fixes it