Interesting, I'll do some test with a higher CRF values and see if I can tell a difference, because you're right, my reason for doing all this is to save space. My logic is that if you are re-encoding, presumably you are trying to save space/bandwidth, so you might as well use Of course, it depends on the type of content and whether it will be streamed or whatever. Of course, other people may have higher standards than I do.įor 4K content, I tend to use significantly higher CRF, like, 34 or even higher with SVTAV1, as whatever losses there are don't seem to be very visible (to me). There was a paper published that suggested a target VMAF of 93 and that has worked well for me. If you have a hard time evaluating things subjectively, you can use ffmpeg's VMAF facility. ffmpeg -i input.mp4 -c:v libx265 -crf 30 -c:a copy outputh265.mkv I used 30 as CRF for testing purposes because the artifacts are more visible :) Could the loss of quality be caused by VLC and its experimental support in deconding.
AV1 shines when it is being squeezed hard. FFmpeg commands I using are the following: ffmpeg -i input.mp4 -c:v libx264 -crf 30 -c:a copy outputh264.mkv and. When I have done this, I have been surprised at how high a CRF I end up using.
I'd suggest clipping out a 5 minute representative sample and encoding using a variety of settings.
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