vurfamous.blogg.se - Ffmpeg crop video frame

With ffplay and crop filter: ffplay -vf "crop=480:270:200:100" input.mp4 See one of the other methods below if you want an output file. This will use your video player to crop while it is playing. This method will not create an output file. Crop with your playerĪ possible solution would be to crop during playback, so you don't even need to re-encode. Development is very active and there is no reason to use an antique.You can't perform any filtering without losing quality when encoding to a lossy format, but you have some options. 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