• Fiona Glaser's avatar
    Chroma weighted prediction · f92aa4ec
    Fiona Glaser authored
    Like luma weighted prediction, dramatically improves compression in fades.
    Up to 4-8db chroma PSNR gain in extreme cases (short, perfect fade-outs).
    On actual videos, helps up to ~1% overall.
    One example video with a decent number of fades (ef OP): 0.8% bitrate reduction overall, 7% bitrate reduction just counting chroma.
    Fixes a lot of artifacts in fades at lower bitrates.
    Original patch by Dylan Yudaken <dyudaken@gmail.com>.
ratecontrol.c 105 KB