lossless 4:4:4 and/or high-bitdepth content?

  • gl-tter

    gl-tter - 2012-05-16

    Does x264vfw actually support writing lossless 4:4:4 and/or >8bit content?

    I'm trying 4:4:4 in Premiere (CS6) but I always end up with 4:2:0. MediaInfo
    shows the correct 'High 4:4:4 Predictive@L5.1' profile, but it shows 'Chroma
    subsampling' as 4:2:0. Visually I can see that it's not 4:4:4 either.

    Is there a trick/setting to making this work, or is it not implemented yet? I
    need this for my master & archived renders - lossless x264 is really nice as
    it has very small file sizes (smaller than Lagarith etc), yet still plays back
    in realtime. It would also be one of the very few 4:4:4 YUV codecs that work
    properly on Windows (ie. without gamma/colour shifts like DNxHD etc).

    4:4:4 YUV is desirable for YUV content as you don't have to go through a RGB
    conversion / studio->full level expansion (like you do with 4:4:4 RGB

  • BugMaster

    BugMaster - 2012-05-16

    Currently x264vfw can't encode in 4:2:2/4:4:4 or RGB. There is plans to add
    support for this in next release (and yes that would be useful for true
    lossless encoding). As for >8bit encoding there is no currently such plans and
    if / when such thing would be added it would need separate binary probably
    (there is problems to have both 8 and 10 bit version of libx264 in one

  • gl-tter

    gl-tter - 2012-05-17

    Thanks, I'm really looking forward to 422/444. >8bit would be excellent too,
    I'm a programmer myself so if I can find any time I'd like to help. A separate
    binary/codec would be fine.


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