Trying to crop video but black borders are added on export

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It sounds like your video mode is actually wrong or at least its aspect ratio or the aspect ratio in export. If you are changing something in export - resolution or aspect ratio - you are doing it wrong. This might help

Export Resolution same as cropped, source video

Wow! You are correct. This surprised even me. Nice find. The steps involving Playlist and Timeline somewhat complicate the story, but it can be used for more advanced scenarios. Many users simply want to do this for a single clip: start with no project open a clip add video filter Crop: Source optionally add other filters and trim as needed choose Settings > Video Mode > Automatic click Export (At this point you can see the Video > Resolution in advanced mode has adopted the new resolution.…