Wavelet filter and *very slow* export

What is your operating system?
Windows 10 (20H2 build 19042.330)

What is your Shotcut version (see Help > About Shotcut)? Is it 32-bit?
20.07.11 (64 bits)

Can you repeat the problem? If so, what are the steps?
I have a 4k 30fps 6 minutes project, that takes a few minutes to export with youtube default preset and 4 hours (!!) with the “Reduce Noise: Wavelet” filter (Medium preset) enabled.

I expected a longer export time after enabling the filter, however checking with Task Manager I don’t see any particular CPU/GPU activity and that’s quite strange for me.

Anyone is experiencing something similar?

This is not a bug. That is the way it is. It is not multi-threaded.

1 Like

Yeah, unfortunately, that filter’s code is not very optimized. It’s painfully slow. It works best on clips that are really dark, really bad, really short, and really need the help. For medium-noise clips, the HQDN3D filter is significantly faster and often sufficient.

1 Like

Thank you both!

Maybe it’s a good idea to document that is slow as hell. I was tempted to try Wavelet instead of HQDN3D because I learn that the results are much better.

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