Devices > Video Cards, Monitors, Televisions, and Projectors

Madvr stutters on 720P with DSP convolution

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Franky:
When I use MADVR with DSP convolution, 720P movies stutter. When I switch off convolution all movies work fine.
When I use a very small tap filter length it works just fine again. But with normal size filters it does not work.
The strange thing is that all 1080p and 2160p movies are ok with long tap convolution and madvr.
I do not understand it and want it fixed. I don't think it's hardware related because I have a high end PC and GPU.

Hendrik:
Too long filters can throw off the audio/video sync, and you get stuttering. This is a fundamental conflict and can't really be solved very easily.

Franky:
Yet, I find it very hard to understand that with 1080p I can use extremely long filters without a problem, and with 720p I must use very small filters for JRiver to work properly.
This makes no sense to me. This problem disturbs me a lot.
I hope someone can help me out...

mattkhan:
Are you upscaling to 4k? What is the source FPS?

Franky:
Yes, I'm upscaling to 4k (attachment)
When I increase the lip sync offsett in JRiver to high values, > 300 ms, the problem is solved, but my lip sync is off then.

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