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  1. I'm upscaling a movie with Video Enhance AI and want the final codec to be x265. Problem is, it doesn't output x265, only x264 or ProRes 422 HQ.

    If I want a "lossless" output that can later be converted to x265 with VirtualDub, which would technically give better quality (even if its not visually distinguishable), x264 with a CRF of 0 or ProRes 422 HQ?

    The original video is an old DVD using YUV 420 with an 8 bit depth.

    Thanks!
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  2. ProRes uses less space and is visually losless (true lossless won't make much difference since you are upscaling video)
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  3. Member Cornucopia's Avatar
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    Crf0 is lossless, but prores never is no matter what setting is used. However, prores color depth is probably overkill when it is 4:2:2 (depends on what processing is subsequently done with it).

    Using a nonzero but low figure for crf with x264 would likely be of similar quality but much smaller filesize.

    Scott
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  4. Yes, x264 at crf=0 will be lossless if your source has 4:2:0 chroma. If it's 4:2:2 chroma you will lose half the chroma's vertical resolution (x264 will convert 4:2:2 to 4:2:0 before compressing).
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  5. the source is already compressed. Use handbrake to upscale (change resolution) then choose x265, try crf 17 to crf 23
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  6. Handbrake is not a good upscaler.
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  7. Originally Posted by jagabo View Post
    Yes, x264 at crf=0 will be lossless if your source has 4:2:0 chroma. If it's 4:2:2 chroma you will lose half the chroma's vertical resolution (x264 will convert 4:2:2 to 4:2:0 before compressing).
    x264 supports 8bit, 10bit, 420, 422, 444, and RGB lossless encoding .

    --input-csp i422 --output-csp i422 --qp 0 will encode 422 lossless.

    (you have to use qp=0 for 10bit lossless; crf=0 is not lossless for 10bit)
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  8. Originally Posted by poisondeathray View Post
    Originally Posted by jagabo View Post
    Yes, x264 at crf=0 will be lossless if your source has 4:2:0 chroma. If it's 4:2:2 chroma you will lose half the chroma's vertical resolution (x264 will convert 4:2:2 to 4:2:0 before compressing).
    x264 supports 8bit, 10bit, 420, 422, 444, and RGB lossless encoding .

    --input-csp i422 --output-csp i422 --qp 0 will encode 422 lossless.

    (you have to use qp=0 for 10bit lossless; crf=0 is not lossless for 10bit)
    Thanks. Does Video Enhance AI include versions of x264 that support and allow you to specify those features?
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  9. Member Cornucopia's Avatar
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    Yes, I didn't mention those other things because the OP said it was a direct rip from DVD which is also 4:2:0. But it is good to know all the options.


    Scott
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  10. Originally Posted by jagabo View Post
    Originally Posted by poisondeathray View Post
    Originally Posted by jagabo View Post
    Yes, x264 at crf=0 will be lossless if your source has 4:2:0 chroma. If it's 4:2:2 chroma you will lose half the chroma's vertical resolution (x264 will convert 4:2:2 to 4:2:0 before compressing).
    x264 supports 8bit, 10bit, 420, 422, 444, and RGB lossless encoding .

    --input-csp i422 --output-csp i422 --qp 0 will encode 422 lossless.

    (you have to use qp=0 for 10bit lossless; crf=0 is not lossless for 10bit)
    Thanks. Does Video Enhance AI include versions of x264 that support and allow you to specify those features?
    Looks like no... and the CLI interface doesn't support advanced x264 switches.

    So VEIA is converting from 4:2:0 DVD src, internally to RGB, to 4:2:0 , then to x264 output locked to 4:2:0

    If the DVD was good quality to begin with , and the model chosen works well for that source, you could theoretically approach 4:2:2 real chroma resolution - you could make an argument against using x264 crf0 in VEIA. But if OP's the "want the final codec to be x265" a 4:2:0 output, then it would not make a difference
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