Dragging for changing the length of a clip to be full on the timeline almost impossible on a long video

[piiskop]

I have met this issue earlier, too. This time, I have a long video - almost five hours long. The project has 41 + 1 input clips. The timeline has three video tracks. One track has the video clips, one track is for an image and one is for a text. I want the text and image to be present during the whole video. So I started dragging the end of the clip. That worked up to some degree and then, stopped working.

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 21.04
Release:	21.04
Codename:	hirsute

Shotcut version 21.08.29

The application log's size is 40.6 MB. This is the end of the application log:

[Debug ] Function autosaveTask finished in 50 ms.
[Debug ] Database::deleteOldThumbnails::lambda removing 0
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[Debug ] Function autosaveTask finished in 31 ms.
[Debug ] Database::deleteOldThumbnails::lambda removing 0
[Info ] Util::isMemoryLow available RAM = 9840324 KB
[Debug ] Function autosaveTask finished in 50 ms.
[Debug ] Database::deleteOldThumbnails::lambda removing 0
[Info ] Util::isMemoryLow available RAM = 9906376 KB
[Debug ] Function autosaveTask finished in 51 ms.
[Debug ] Database::deleteOldThumbnails::lambda removing 0
[Info ] Util::isMemoryLow available RAM = 9529996 KB
[Debug ] Function autosaveTask finished in 45 ms.
[Debug ] Database::deleteOldThumbnails::lambda removing 0
[Info ] Util::isMemoryLow available RAM = 9422928 KB
[Debug ] Function autosaveTask finished in 42 ms.
[Debug ] Database::deleteOldThumbnails::lambda removing 0
[Info ] Util::isMemoryLow available RAM = 9437332 KB
[Debug ] Function autosaveTask finished in 46 ms.
[Debug ] Database::deleteOldThumbnails::lambda removing 0
[Info ] Util::isMemoryLow available RAM = 9415016 KB
[Debug ] Function autosaveTask finished in 29 ms.
[Debug ] Database::deleteOldThumbnails::lambda removing 0

[timlau]

Don't look like a generic issue, at least not in Shotcut 22.01.30
I created a 4 hour+ video with lots of clips and at max. zoom out level.
have no problems, resize a clip (Tested on Fedora Linux 35, with Shotcut 22.0.30 (appImage)
https://user-images.githubusercontent.com/283985/152178988-24afc205-ebe1-4f5d-a55e-3c31844f11a7.mp4

Regarding color clips, they can only be 4 hours long, so this can be the problem you see here.

With very long projects, it is a good idea to split them up in smaller projects and join the rendered files with

ffmpeg -i "concat:01.mp4|02.mp4" -codec copy output.mp4