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How to change resolution without compromising video quality using ffmpeg?

Is there a big difference between encoding the video and audio separately in the original video file and encoding the original video file as is? If you're only downscaling the video, then you can ...
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verify lossless in H.264

Just do this: ffmpeg -i $input -i $output -lavfi ssim -f null - This will compare the two videos using SSIM. If it's lossless then you will see: SSIM Y:1.000000 (inf) U:1.000000 (inf) V:1.000000 (inf)...
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