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  • Ronald S. Bultje's avatar
    Don't use compound prediction for golden frames based on alt-ref frames. · 959b296a
    Ronald S. Bultje authored
    These frames can force reference frame (arf), mode (zeromv) and skip,
    which means that if we use compound prediction (i.e. arf+last), we
    might use a blend of a perfect (arf) and an imperfect (last) predictor,
    leading to semi-garbage display and thus a huge drop in SSIM/PSNR (up
    to 10dB for some frames I analyzed).
    Gives a +0.2% gain on YT.
    Change-Id: If1f2b7899ad165684af3808fd379295e82558cbb