If you need to crop a video because you only need a small area of it, you can achieve this using the free program Avidemux.
In order to get started, you will need to first open the video file in Avidemux. As cropping the video cannot use the same frame data, you will need to re-encode the video. To do this, use the drop-down box under 'Video Output' to select the format you want the encoded video to be in. You can select anything except 'Copy'. 'Mpeg4 AVC (x264)' is the recommended setting, as it is a very common codec. To crop the video, click on the 'Filters' button below that, and click on 'Crop' under 'Available Filters' on the window that pops up.
After double-clicking on 'Crop', a new window will pop up displaying the video. You can adjust the crop using the four number fields in the top left-hand corner of the window, and you can adjust these values finely using the up and down arrows. You can also click and drag the red rubber band in order to set the crop[ that way, and you can use the 'Hide Rubber Band' checkbox to hide the red lines, so you can see exactly what your crop will look like. The 'Auto Crop' button in the top right-hand corner can also be used if you want to remove black bars from your video, it works best if there is a good contrast between the video and the black bars, so you can use the timeline to scrub through the video to find a good frame. Now just click 'Ok' to set your crop. Now just save the video, and it it will encode a cropped version and export it where you want. You can also combine this with other filters as well as only export a segment of it by
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