Forgive me for I'm new to here, but I've been searching for solutions all the day, yet still puzzled by this problem. I try to downscale a 3840*2160 video to 1080p, and here's what I first did:
ffmpeg -i original.mkv -vf scale=1920:-1 downscaled.mkv
And here are the results:
At first, I thought it's because I didn't apply the correct settings to my video player (potplayer), but even I set exactly the same splitter/decoder/renderer/..., it still didn't work.
Then I searched and tried different ways like
pix_fmt yuv444p10le which is from a post here, and later defined encoders, crf...... but all didn't work.
Could anyone please help me, many thanks!
Add: I then used HandBrake, a GUI video transcoder, to downscale the original video, it worked well, at least, looks a lot better.