![]() ![]() ![]() Here are few useful commands which can be used instead of number, to specify height and width of the getting output image.Ī simple example: If you want image width just double from its actual width, you can use the below command for the same: ffmpeg -i input.jpg -vf scale=iw*2:ih input_double_width. ffmpeg -i input.jpg -vf scale=-1:-240 output_240.png Likewise if you want to resize your video/image in aspect ratio of height, you can use following command. For example, see below command line: ffmpeg -i input.jpg -vf scale=320:-1 output_320.png Usually, if you resize any video/image to fixed height and width, then the output image may be starched or appears starched.įor getting the perfection in the resized image we need to specify only one component, either width or height, and set the other component to -1. You can use same command for images too: ffmpeg -i input.jpg -vf scale=320:240 output_320x240.png If you use the NVDEC resize filter -resize, without scalenpp, the right video is produced. In order to basically resize your current video to your specific size (e.g 320x240), you should use the scale filter in its most basic form: ffmpeg -i input.avi -vf scale=320:240 output.avi If you have a yuvj420p video, in my case 5k HEVC, but I think h264 would also produce this problem, and you scale it using scalenpp filter, then encode it as h264, both sides using the NVENC/DEC you get a green video. jpg) is going to be this (535x346 pixels): ![]() In all the following examples, the particular starting image (input. ![]() He continues to contribute to FFmpeg, and has fixed some bugs in libswscale after GSoC has ended. An example to use gamma corrected scaling would be: ffmpeg -i input -vf scale512:384:gamma1 output Pedro has done impressive work considering the short time available, and he is a FFmpeg committer now. You more can be found in the FFmpeg official documentation. He also added gamma corrected scaling support. FFmpeg has an extremely effective level filtration system, which usually can be used to completed the various tasks. ![]()
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