alt Hacker NewsBecause of conversion losses, I have to imagine this is subtly very bad.
Every form of lossy compression deleted data. Yes AV1 is more efficient but only when working off of high quality originals.
H265 already deleted a ton of data. It can never recover the quality loss. Compressing even further can only worsen the image.
Replies
arnaudsm • today at 4:46 PM
What's the optimal strategy then ? 50 GB Blu-ray remux => 3 GB AV1 ?
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stefan_ • today at 4:40 PM
Well its sure gonna get the filesize down though, great HECV -> AV1 transcoding success..
While I agree with you, I find that sometimes the “experience” can improve.
The most common “artifact” of AV1 is to make things slightly more blurry for example. A common H.265 artifact is “blockiness”. I have re-encoded H.265 to AV1 and not only gotten smaller files that playback better on low-end hardware but also display less blockiness while still looking high-resolution and great colour overall.
I always encode 10 bit colour and fast-decode for re-encoding to AV1, even if coming from an 8 bit original.