My preview is very laggy, I've watched countless tutorials and read many Shotcut forums and I still don't know how to fix it. It is especially laggy whenever I use video filters

[Quannot]

I am new to this programme and I don’t know how to fix this problem: When I add a video filter, it makes the audio and video of the preview choppy.

[Quannot]

Please someone help.

[brian]

This is a very common question. Maybe you are not searching for the right terms.

Have you seen these?

Proxy Editing

Introduction Proxy editing is the process of creating and using low resolution videos and images in places of the original or optimized (Convert to Edit-friendly) files. This provides the advantage that your computer has less work to do in realtime while editing: decoding, scaling, and effects. This is, quite simply, because there are less pixels to compute. Then, when you are ready to export, it will use the original (or optimized) files for full quality. Performance is optimal when the pre…

Preview Scaling

The Preview Scaling setting may be used to reduce the resolution of video processing when you are using a fair amount of filters, transitions, and track blending. This may help with the performance during the editing process. [image] However, keep in mind that the source video or images must typically be scaled down to the designed preview scale, and that will have a processing cost. See Proxy Editing for the remedy to that. Proxy generates substitute clips at the same resolution as preview sc…

Display Method

This setting is only available on Windows and Linux. Shotcut uses OpenGL technology to draw its user interface and display video. OpenGL is typically implemented in the GPU of your computer and its driver in the operating system. These two pieces (Shotcut and the UI library it uses) and the OpenGL implementation need to communicate using a complex protocol. Sometimes, they do not communicate well and have compatibility or interoperability problems. Thus, there are some workarounds: use only s…

Consider searching for posts about those features to help reduce lag.

[Quannot]

I have proxy turned on, my display method is DirectX and I have my preview scaling to 540p but I have a
split where the ‘Size, Position & Rotate’ filter is on and when I preview it the video and audio goes to 1 fps. Also, whenever I playback from a specific point in the video, the video and audio stutter for 2 seconds. Is there a fix for these issues?

[shotcut]

@Quannot

I have proxy turned on

Just because you turned proxy on does not mean the proxies were created. Are you sure they were created? Also, just because you turn all of these on does not mean it is going to play perfectly smooth all the time. It will not, it is simply better. It also depends, of course, on your computer and the resolution and frame rate of your video. You need to export if you want to see how it will look in the end.

[Quannot]

Ok, thank you!