Bad rendering slowed down videos

What is your operating system?
Windows 10

What is your Shotcut version (see Help > About Shotcut)?
Latest - 24.09.13

Can you repeat the problem? If so, what are the steps?
WYSIWYG isn’t working…


This is the edit view - As you can see, this is first frame of replay - and you can see that lines are in exact position, and you can’t see the ball - because it is standing yet.

And this is first frame of render:

The lines are on incorrect position, because this is about ten frames later (the camera is moving left and you can see the ball in the middle of picture

And the problem is repeatable - I take part of main video, I change the speed to 0.025000x then I cut to begining (one frame before ball movement) then I cut 5 seconds.

And I noticed it before (each of my replays are belated - but on half speed it wasn’t so spectacular, but I wondered why always is belated. But now I’m sure, because ALL of offsides are wrong the same way… On editor it is perfectly set, on render it is moved by about 10 frames (but not ten frames of reduced speed - ten frames of normal speed than reduced speed)

You are using Proxy, and that can hide a problem with the source such as frame accurate seeking, which seems to be the problem. It is not possible to provide frame accurate seeking for every video file. I suggest to turn off proxy, adjust things, and try again.

Unfortunately you’re right… So proxy becomes useless…Is there a way to set one track only NOT to use proxy???

Proxy can be deceiving by its very nature. This is mentioned in our official documentation. The same goes for preview scaling. Each of these features take you further away from WYSIWYG. You can disable proxy for a clip in Properties

I can accept, that I can’t see the details and the final result looks different… But moving back or forward on timeline is unacceptable…Essential of film editing is proper cutting… Very dissappointing and very unexpectable…

Switch between proxy and preview scaling modes as needed.

Is your source variable framerate? If so, use Convert to edit friendly which creates a file that is frame exact and your off-side lines will be correct.

Oh, how to check it?
I use two kinds of GoPro and camcorder sony, so it is possible
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They all seem to not be variable framerate. The gopro’s likely don’t have the issue so I’d focus on the sony.

Looking at your first screenshot in the thread I see .MTS extension and 0.025x speed. Some MTS files aren’t frame accurate when seeking so my best guess is to convert that one to edit friendly for a run and check to see if it still has the issue. You can convert only a small subclip as a test so you won’t have a bunch of huge files (use the middle quality option for no quality loss).

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