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Render glitches in Fusion - and constant crashes

PostPosted: Sat Jun 19, 2021 10:58 am
by dukevannori
Hi everybody... I´m sorry if this was covered somewhere else, but my english is not as good as that I would find the right words to describe this glitch apparently...

I am compositing in Fusion with mp4 clips from a SOny A7SIII. And besides crashing every other 10 minutes i get these very strange render glitches:
Screenshot 2021-06-19 at 12.51.37.jpg
Screenshot 2021-06-19 at 12.51.37.jpg (108.84 KiB) Viewed 513 times


they apear every other frame, sometimes all frames - and they are moving. im talking about the transparent lines ...

I use a delta key and a 3D camera to place the clips inside a camera movement.

you have any idea? im on the latest 17.2.1 Build 12

thanks so much!!

Re: Render glitches in Fusion - and constant crashes

PostPosted: Sat Jun 19, 2021 11:13 am
by Uli Plank
Describe your hardware in detail and your resolution.

Re: Render glitches in Fusion - and constant crashes

PostPosted: Sat Jun 19, 2021 1:23 pm
by dukevannori
oh yes, sure

- its a macbook pro 16" 2019 with AMD Radeon Pro 5500M 4 GB; 2,3 GHz 8-Core Intel Core i9 & 16 GB 2667 MHz DDR4; running MacOS 10.15.7

and the material is 4K

i know, the machine is way to underpowered - but these renderissues should not happen ... i get the crashes maybe when ram is full - but also this should be handled differently ... or am i wrong?

thanks!!

Re: Render glitches in Fusion - and constant crashes

PostPosted: Sat Jun 19, 2021 1:30 pm
by Jim Simon
One thing I would try is Transcoding the H.264 originals into a more robust codec like ProRes and using that for editing.

Re: Render glitches in Fusion - and constant crashes

PostPosted: Sat Jun 19, 2021 4:16 pm
by Uli Plank
It is underpowered for 4K. But if you are trying to render into H.264, try ProRes for output instead.

Re: Render glitches in Fusion - and constant crashes

PostPosted: Wed Sep 22, 2021 3:17 pm
by dukevannori
i transcoded everything into prores and also the output is prores, but i still get these glitches on 17.3.1 build 5...

in final output... cleared all render cache ... but still
they are also consistent even if i render just that one frame-what to do?

thanks

Re: Render glitches in Fusion - and constant crashes

PostPosted: Wed Sep 22, 2021 3:19 pm
by Uli Plank
So you did transcode your sources too? If so, what’s your timeline resolution?
If it’s in UHD, try HD.
You might still be overwhelming your GPU.

Re: Render glitches in Fusion - and constant crashes

PostPosted: Wed Sep 22, 2021 3:27 pm
by dukevannori
even rendering just one single frame? and all frames before and after are ok?

yes its UHD and i did transcode all sources.

its like this with proxies as well ... so i guess there is something in the composition or somewhere else ... i cant find the answer. on the fusion page going through the timeline frame by frame its ok, going backwards frame by frame its there ...

very very weird behavior

Re: Render glitches in Fusion - and constant crashes

PostPosted: Wed Sep 22, 2021 3:35 pm
by Uli Plank
Does it show in the source? It might be a recording glitch then.
Oh, and you could try to deactivate hardware support for rendering.

Re: Render glitches in Fusion - and constant crashes

PostPosted: Wed Sep 22, 2021 3:41 pm
by dukevannori
thanks for the tip with hardware - ill try that

no its not in the source - its in a fusion comp ...

Re: Render glitches in Fusion - and constant crashes

PostPosted: Wed Sep 22, 2021 4:29 pm
by Uli Plank
Try an HD timeline if you didn't yet.