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Resolve is not the best tool for it as it will render into timeline resolution (after cropping it will scale video to it). If it's a screen recording you may have problems in Resolve with framerate. Development is very active and there is no reason to use an antique.Andrew Kolakowski wrote:What end format do you need? If this is the case for you then get a modern ffmpeg.

This is possible with any player worth using.Īncient ffmpeg builds used -croptop, -cropbottom, -cropleft, -cropright options instead of the crop filter. Instead of cropping and re-encoding, consider cropping upon playback. See FFmpeg Wiki: H.264 Video Encoding Guide for more info. Notesĭefault encoder for MP4 is libx264 (H.264 video) or mpeg4 (MPEG-4 Part 2 video) depending on your ffmpeg build. This way you can experiment and adjust your cropping without the need to encode, view, repeat. You can take a crop (heh heh) and preview it live with ffplay: ffplay -i input -vf "crop=in_w:in_h-40"

The filter will automatically center the crop if x and y are omitted such as in this example.

The output width and height can also be used with out_w and out_h.Ĭrop 20 pixels from the top, and 20 from the bottom: ffmpeg -i in.mp4 -filter:v "crop=in_w:in_h-40" -c:a copy out.mp4

You can refer to the input image size with in_w and in_h as shown in this first example.

To crop the bottom right quarter: ffmpeg -i in.mp4 -filter:v "crop=in_w/2:in_h/2:in_w/2:in_h/2" -c:a copy out.mp4

The audio is stream copied in this example, so re-encoding is avoided.

x and y specify the top left corner of the output rectangle.out_h is the height of the output rectangle.out_w is the width of the output rectangle.Use the crop filter: ffmpeg -i in.mp4 -filter:v "crop=out_w:out_h:x:y" out.mp4