#Ffmpeg scale 720p 480p
A low quality 480p will struggle to make it at 1080p.
#Ffmpeg scale 720p 720p
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 If I take out the scaling and leave the yadif alone you can see the horizontal lines flickering when there is no movement. Lines in the video look aliased with above. 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 /ffmpeg -i recording.ts -c:v libx264 -profile high -vf 'yadif3:0,scale1280:720' -b:v 4M -c:a copy -f mpegts out.ts. 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 an excellent source on resampling methods go here. This uses FFmpeg scaling with Lanczos resampling. ffmpeg -i beach.mkv -vf scalew1280:h720:forceoriginalaspectratiodecrease -c:a aac -ar 48000 -b:a 128k -c:v h264 -profile:v main -crf 20 -g 48. The conversion process will begin effectively. Convert your video files After being sure of your new video specifics, hit the ‘Enter’ button. To change a video file to be 1080p in FFmpeg: ffmpeg -i input.mp4 -vf scale=1920x1080:flags=lanczos output_1080p.mp4 ffmpeg -i input.mp4 -vf scale-1:720 output.mp4 With this command, your resized video will attain a new resolution of 1080 / 720 1.5 Your height will scale down to 1920/1.5 1280p Step 6. 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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