Wavelet filter and *very slow* export

Help/How To
1

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?

2

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

1 Like
3

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
4

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.

5

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