A low quality 480p will struggle to make it at 1080p. So if you want to stretch the movie anamorphically to a new aspect ratio you need to manually set the pixel aspect ratio, called the SAR for 'Sample Aspect Ratio', thus for square pixels use: ffmpeg -i input.mov -vf scale720x406,setsar1:1 output.mp4. ![]() A high bitrate 720p video can look good at 1080p and maybe work at 4k. The end result is going to depend on your source footage. ffmpeg -i input.mp4 -vf scale=640x480:flags=lanczos -c:v libx264 -preset slow -crf 21 output_compress_480p.mp4Īll you need to do is change the scale= to the dimension you want, then change the output to indicate the video dimensions. To downscale video all you need to know is popular dimensions. To upscale to 4k video: ffmpeg -i input.mp4 -vf scale=3840x2560:flags=lanczos -c:v libx264 -preset slow -crf 21 output_compress_4k.mp4 Downscale with FFmpeg To upscale a video to 1080p whilst encoding it: ffmpeg -i input.mp4 -vf scale=1920x1080:flags=lanczos -c:v libx264 -preset slow -crf 21 output_compress_1080p.mp4 Whilst Lanczos in most cases wont be the sharpest it combines sharpness with smooth to make the footage look better overall, Avoiding blocky footage. for j in (.jpg) do ffmpeg -i 'j' -vf scale480:-1 'Small-nj.jpg'. 2 channels input file B.mp4 stream 0: video 1920x1080 stream 1: audio 2. For an excellent source on resampling methods go here. It can also convert between arbitrary sample rates and resize video on the fly. This uses FFmpeg scaling with Lanczos resampling. ![]() To change a video file to be 1080p in FFmpeg: ffmpeg -i input.mp4 -vf scale=1920x1080:flags=lanczos output_1080p.mp4 Here are some FFmpeg commands to help you out: Upscale with FFmpeg ![]() ![]() Making a video smaller (downscaling) or bigger (upscaling) with FFmpeg is actually very easy.
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