How to get cropping of video right

[bmaehr]

Hello,

I have a video with 5312 × 2988 with 50 Hz (GoPro) and would like to crop an area of 2400 x 1600 at 30 Hz out of it and export a given time range of that video.
I have been trying for hours also with support of AI to get the right workspace settings, applied filters to achieve the right result but without success.

Now I have done it with ffmpeg

ffmpeg -i GX010005.MP4 -map 0:v:0 -map 0:a:0 -ss 00:04:20.09 -to 00:06:40.27 -vf "crop=2400:1600:1900:532" -c:v libsvtav1 -crf 30 -preset 6 -c:a libvorbis -qscale:a 3 GX010005_part1.mkv

directly but I am still curious how to do it with Shotcut.

Can somebody tell me step by step in short how to achieve the same result?

[shotcut]

Instead of generic searching you can try a focused search using this forum with simply “crop.” The default search settings is ordered by relevancy, and we have prioritized the documentation above other posts. The fourth search result yields the current best solution:

Reframe Output Video Filter

Reframe or reframing is a way to crop a video or editing project in order to export it to a different aspect ratio. For example, you made a video project in 16:9 aspect ratio landscape/horizontal orientation but now want to make a 9:16 portrait/vertical orientation video for social media. Other forms of cropping are used primarily within a composition to remove bad edges (Crop: Source), zoom in to fill the frame (Size, Position & Rotate), add colored borders (Crop: Rectangle), or clip an overlay…

It is not as simple as a dedicated cropping video tool or a single-clip orientated command line because a video editor is designed to handle multiple clips, possibly at different resolutions and aspect ratios. The notion of cropping an image or video changes its aspect ratio, which conflicts with the notion of a composition aspect ratio.

Another approach is described here

Crop: Rectangle Video Filter

Crop: Rectangle is a filter used to crop a specified region of a video clip or image file to the current Video Mode. Keyframes are available with this filter. Filter can be applied to Source, selected clip, Video Track or Output. Parameters Preset: Save current settings for later use. To use later, just click the drop-down menu for selection. Position & Size: Values can either be input by keyboard or adjusted by the adjustable border corners and center. Corner radius: Apply a corner radi…

[bmaehr]

Ok, lets start with a simple question: Should the workspace resolution be 5312 × 2988 or 2400:1600?

[shotcut]

Given the above 2 approaches, it is the source resolution aka Video Mode > Automatic.

There is yet another approach where you set the video mode to the desired resolution AND aspect ratio. Then, use the Size, Position & Rotate filter.

[bmaehr]

I tried the first approach and cropped the vide with “crop source”. But how can I tell the export to just export the part of the vidio inside the black borders?

[shotcut]

I do not understand what you did. The first approach is Reframe, and you should not use Crop Source with it. Maybe you should show a screenshot or 2 that shows the filters, preview, and export panels.