Overall performance issues

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With proxy editing + 360p preview scaling I managed quite well to edit 1440p videos, but now I hit a new roadblock: I currently have over 12h of videos on my timeline and previewing + going forwards/backwards gets exponentially worse and choppy.

The hardware isn’t the bottleneck as I track the overall load + temperatures via HWiNFO.

Any performance improvements I can do on my end, or is it expected for Shotcut to slow down with that amount of videos currently on the timeline?

2

There could be several factors why you are getting performance issues. The only fact you revealed is the overall length of your project is 12 hours using Proxy & Preview Scaling.

There are things beyond load & temps that could be a contributing factor. Having all of your media on SSD or NMVE drives is highly crucial. All drives go bad, it’s just a matter of when. You could be running out of memory.

  • Sounds silly, but have your tried restarting your computer?
  • Does your computer meet the minimum specifications?
  • Are you running Anti-Virus programs? If so did you whitelist Shotcut? Tried with Anti-virus off?
  • Is Shotcut whitelisted with Windows Defender (if you’re using Windows)?
  • Do you have any variable FPS clips that you have not converted to Edit Friendly?

This tutorial might be beneficial for you. It was created by @bentacular of this forum.

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  • Proxies are on NMVE, the original files on external HDD
  • I did a few Shotcut restarts which alleviated it to a small degree
  • With 32GB Ram, Ryzen 7 5800x + RTX 3070 I got more than enough specs
  • After a previous issue where I didn’t use proxies and wondered why going forward/backward in the original 1440p clips was so slow I only use proxies now for editing

The other points you mention are moot because I had no issues with editing other 1440p videos, ranging from ~2-7h playtime: I’m only seeing those issues with this 12h video.

4

Long timelines are slow. If you are not using multiple tracks, then do not use the Timeline. Timeline is not necessary in Shotcut; you can also make a playlist with trimmed sub-clips and filters and export that.

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