![]() ![]() Adding noise ( dithering) after noise removal can help prevent/reduce banding also. Noise removal can increase the chance of banding because noise helps prevent it. Lowering the CRF value does the same, so rather than messing around with x264 settings all the time. if changing an x264 setting encodes a video more accurately, it invariably increases the bitrate too. It's not too hard with MeGUI (it has an AVS Cutter under the Tools menu). I'm not sure how you'd do that using Handbrake. It requires adding -stitchable to the command line to ensure you can append the encoded video (and using the same x264 settings each time, although you can change the CRF value). Or you can probably specify zones for the x264 encoder but I generally just split the encoding job. I do that by splitting an encode into sections and append the encodes together later. Usually I wouldn't encode the whole video at a lower CRF value, just the section(s) where it's required. Whenever I have banding problems I lower the CRF value (I generally encode using CRF18 and lower it to CRF17 or CRF16 to reduce banding). They're the changes from the default settings when using the corresponding tuning. I'm pretty sure the above is correct, but don't hold me to it. Tune Animation = deblock 1, 1 and -psy-rd 0.40:0.0 and -aq-strength 0.6 and increases the number of B and Ref frames Tune Grain = deblock -2, -2 and -psy-rd 1.0:0.25 and -aq-strength 0.5 and -ipratio 1.1 -pbratio 1.1 and -qcomp 0.8 I don't think it changes any other settings. ![]() These days, it's probably not necessary, and sticking to Tune Film is fine for most video. The way I understand it, back in the early x264 days (before the psychovisual enhancements were added), it wasn't as good at retaining detail, so people used the lowest deblocking setting they could get away with, without noticeable blocking. The x264 tuning "film" sets deblocking to -1 and -1, although Handbrake doesn't show you the change in it's GUI. Ī very exaggerated example of what blocking might look like. Positive numbers can blur a little more but reduce the chance of blocking. Negative numbers can give you more picture detail but also increase the chance of "blocking". ![]()
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