X265 deblock

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X265 deblock

The default preset is medium. It does a reasonably good job of finding the best possible quality without spending excessive CPU cycles looking for the absolute most efficient way to achieve that quality. When you use faster presets, the encoder takes shortcuts to improve performance at the expense of quality and compression efficiency. When you use slower presets, x tests more encoding options, using more computations to achieve the best quality at your selected bit rate or in the case of —crf rate control, the lowest bit rate at the selected quality.

The presets adjust encoder parameters as shown in the following table. Any parameters below that are specified in your command-line will be changed from the value specified by the preset. There are a few --tune options available, which are applied after the preset. The psnr and ssim tune options disable all optimizations that sacrafice metric scores for perceived visual quality also known as psycho-visual optimizations.

By default x always tunes for highest perceived visual quality but if one intends to measure an encode using PSNR or SSIM for the purpose of benchmarking, we highly recommend you configure x to tune for that particular metric. The purpose of this option is neither to retain nor eliminate grain, but prevent noticeable artifacts caused by uneven distribution of grain.

Tune grain also biases towards decisions that retain more high frequency components. It also enables a specialised ratecontrol algorithm --rc-grain that strictly minimises QP fluctuations across frames, while still allowing the encoder to hit bitrate targets and VBV buffer limits with a slightly higher margin of error than normal. It is highly recommended that this algorithm is used only through the --tune grain feature. Overriding the —tune grain settings might result in grain strobing, especially when enabling features like --aq-mode and --cutree that modify per-block QPs within a given frame.

It is intended for use with 4K content at high bitrates which can cause decoders to struggle. It disables both HEVC loop filters, which tend to be process bottlenecks:. And it disables intra blocks in B frames with --no-b-intra since intra predicted blocks cause serial dependencies in the decoder.

There are two halves to the latency problem. There is latency at the decoder and latency at the encoder. The decoder latency is removed by:.I wanted to see whether it could be done at all, in theory. To make it happen, I had to choose extremely low bitrates not just for video, but audio as well.

There are even subtitles included in my example, which are present in Matroska-style zlib-compressed [. And yes, it sounds terrible. But it still gets across just enough to be able to understand what people are saying and what type of sounds are occurring in a scene. Music and most environmental sounds are terrible in quality, but they are still discernible. Regular streaming would still be possible with my result files, but not without prebuffering.

See here:. The first one is the source note: From [ Crunchyroll ], legal to watch and record in my country at this timethe second my x and the third my x versions. So as you can see, x messed up pretty big, overshooting by Note that the color shown in those thumbnails is not representative of the real images, this has been transformed to color.

This is just to show you some basic differences between what x and x are able to preserve, and what they are not. Overall, x fucks up big time. There are frames with partial macroblock drops and completely blank frames even! Scene 1 left: x, middle: x, right: source file :. You can see the macroblock size pretty clearly in the blocky frame to the left. In the first case it seems as if x is trying to preserve shades of green more than anything, but in the second case, something terrible happens.

There is a lot of red in the scene before this one, and there is quite some red on those can labels as well. And it stays like that for the entire scene as well, which means for several seconds. The greens and browns are lost. Block artifacts are excessive as well, but at least x managed to give us whole frames here, with some color even.

I mean, not just in the chroma subsampling, but in encoding as well? But red seems what x drops last, and it happens more than once. Given the detail and movements in that last part, even x fails though.

And that other frame with the cuteness overload? There are a lot like those, where x just kinda panics, drops everything it has and then frantically tries to re? A: Like shit! Removing grain increases the picture quality for a given bandwidth and requires a visual assessment before the transcode of a raw BR stream. After coding approximately streams, all at 2K or 4K then the following is now my standard starting point for 2K content, using version 2.

Interesting, thanks. Q1 Changing the qcomp values changes anything? Q2 Does Medium and very slow yield same video quality? Q5 Should I keep using crf or should I use Avg bitrate to get more quality? The tests you do are truly amazing and I appreciate the fact that these tests really helped me learn a lot.

Love this mate. I was looking for this exact information see I have a 3G connection with 2GB of data, but after those 2GB it throttles down to 0. I want to encode video on a computer at my home and send it to the 3G connection. Downloading 1GB of data takes a day currently. But with some serious encoding I could pretty much stream in real time.

Although — as you can clearly see here — it would still look awful!VideoHelp Forum. Remember Me? Download free trial! Results 1 to 29 of What is the difference and what is gained by going negative? In short, negative values are weaker, positive values are stronger produce more blurry results i. Negative numbers can give you more picture detail but also increase the chance of "blocking".

Positive numbers can blur a little more but reduce the chance of blocking. The way I understand it, back in the early x days before the psychovisual enhancements were addedit wasn't as good at retaining detail, so people used the lowest deblocking setting they could get away with, without noticeable blocking. These days, it's probably not necessary, and sticking to Tune Film is fine for most video.

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Tune Film also sets --psy-rd 1. I don't think it changes any other settings. They're the changes from the default settings when using the corresponding tuning. Reason: spelling. Are these numbers related to banding in any way? Banding is mainly related to too coarse quantization due to too low bitrate.

Adaptive Quantization is a more common way to fight banding by spending more bitrate to low detail areas.

Positive numbers for deblocking parameters may be able to filter banding a bit more, but will also blur the whole picture where quantization is coarse. Negative values may be useful to retain exaggerated film grain like in "" but will require a high bitrate, preferably a CRF of at most Please note that deblocking parameters are a more or less symmetrical feature. They change the behaviour of both encoder and decoder.

It sounds like most non-animated sources should be -1, If I choose to dither, should it only be in extreme cases or is it something I can always leave on?While developed as a replacement for H. Despite these downfalls, HEVC does compress much better in higher crf lower bitrate and has been a really good codec to use since Most modern devices support hardware decoding iOS, Android, laptops, Macs, etc. HEVC does have a slight advantage in terms of parallel encoding efficiency, though they are both just as slow when encoding compared to x Unfortunately the reference encoder libaom is in a very early stage and takes forever to encode.

It performs not as well as libaombut quality is still better than x SSIMand encode times are way more reasonable. For now, they look promising, and I am excited to see results in a few years.

HEVC took years before it was more widely accepted by Anime encoders, and took 5 years until before I began experimenting with it. AV1 began major development in mid so by that logic we got more years to go. Handbrake is a great tool for beginners. It allows reading Blu-ray disks unencryptedand has a pretty UI to deal with.

Hopefully bit pipeline will be supported once HDR becomes common. Guides on how to do this are easily found. To keep things short and not get into technical details: use the bit encoder Main 10 profile.

Why not just use bit then you say? It is much less supported, and from my tests back in the bit encoder is actually worse than the bit encoder at high crf due to less resources put into developing it. First, one must understand x is fundamentally different than x In x, the slower the preset, the bigger the file size is at the same crf.

Anime Encoding Guide for x265 (HEVC) & AAC/OPUS (and Why to Never Use FLAC)

While counter intuitive at first, this is due to the more complex algorithms used to more precisely estimate motion and preserve details. The move from fast to medium to slow each reduces bad noise and artifacts, though I do have to admit going any slower I could not observe any significant improvements x 3.

Now to answer the questions which preset to use. In my mind, there are only 3 presets worth using: fastslowand veryslow. It is barely any slower than the others while offering slightly better quality. It does, however, have its place, especially with the recent changes in v3.

The only downside to veryslow is its encoding speed which is a gazillion times slower than slow and requires a supercomputer. At lower crf values you barely get any improvements and thus could be ignored. Presets vs.Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules.

User Name Remember Me? Hey folks, I've been searching these forums and the web and have come to the conclusion that there isn't really a good collection of baseline encoding settings or proposed tunes for x that cover various types of media.

Given x doesn't really provide much in the way of content specific tunes aside from grainthis seems like something that would be useful to the enthusiast community, and would give people a good starting point for their own content-specific tweaks.

So I am proposing establishing a sticky thread or using this one as a place where people can share their settings and discuss what works or doesn't work and why.

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Assuming others are interested, of course. As a starting point, I found the following as the most recent proposed tunes for animation and film in the HEVC discussion forum crf 18 p.

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However, they were posted more than a year ago, and may no longer be relevant based on the changes that have been made to x in that time Last edited by Merlin93; 28th September at Essentially, especially since x 2.

In my opinion, --no-sao is all the deviation from x 2. If I encounter sources with extreme grain, I either use x or don't bother at all and just remux.

x265 deblock

Works wonders in handbrake. Originally Posted by Wolfberry. And there does not exist universal setting parameters for every content, you can even tweak your parameters by episode if you want. No parameters are perfect, but I think that it still has its reference value.

Originally Posted by Merlin Got it. So when I say baseline, I mean the starting point before making any tweaks. Last edited by excellentswordfight; 3rd October at Originally Posted by excellentswordfight. I would say that --preset slow --no-sao is a pretty good baseline when quality is prioritized.

I have been testing sao with the new builds of x It does not seem to smooth the way it used to. For p anime I have had good results with: --crf 18 -p 8 -F 1 --pools "5" --lookahead-slices 0 --rd-refine --tskip --tskip-fast --tu-inter 4 --tu-intra 4 --limit-tu 4 --rect --amp --limit-modes --no-strong-intra-smoothing Adding --no-sao hurt quality and did not improve sharpness.

This was not the case the last time I tested sao probably about 6 months ago. Does this match anyone else's experience? Last edited by Asmodian; 3rd October at Originally Posted by Asmodian. Adding --no-sao hurt quality and did not improve sharpness.

x265 deblock

Last edited by Arhu; 30th December at For p anime I have had good results with: --crf 18 -p 8 -F 1 --pools "5" --lookahead-slices 0 --rd-refine --tskip --tskip-fast --tu-inter 4 --tu-intra 4 --limit-tu 4 --rect --amp --limit-modes --no-strong-intra-smoothing. Find More Posts by benwaggoner.

Last edited by Toku; 4th November at Originally Posted by benwaggoner. Why --pools "5"? Are you running on a NUMA system? I would think that explicitly setting --frame-threads would control quality and perf better. Originally Posted by Toku.In addition each codec may support so-called private options, which are specific for a given codec.

Sometimes, a global option may only affect a specific kind of codec, and may be nonsensical or ignored by another, so you need to be aware of the meaning of the specified options. Also some options are meant only for decoding or encoding.

In 1-pass mode, bitrate tolerance specifies how far ratecontrol is willing to deviate from the target average bitrate value. Lowering tolerance too much has an adverse effect on quality.

Only write platform- build- and time-independent data. This ensures that file and data checksums are reproducible and match between platforms. Its primary use is for regression testing. It is the fundamental unit of time in seconds in terms of which frame timestamps are represented.

Set cutoff bandwidth.

x265 deblock

Supported only by selected encoders, see their respective documentation sections. It is set by some decoders to indicate constant frame size. Set video quantizer scale compression VBR. It is used as a constant in the ratecontrol equation. Must be an integer between -1 and If a value of -1 is used, it will choose an automatic value depending on the encoder.

Set single coefficient elimination threshold for luminance negative values also consider DC coefficient. Set single coefficient elimination threshold for chrominance negative values also consider dc coefficient. Note: experimental decoders can pose a security risk, do not use this for decoding untrusted input. This is useful if you want to analyze the content of a video and thus want everything to be decoded no matter what.Opened 5 years ago.

Last modified 20 months ago. Summary of the bug: When I'm trying to pass x parameters by using -xparams, multiple issues happen:. So, it seems that the problem is complex, and not related only to specific x parameters.

Download all attachments as:. It's perhaps useful to note that x doesn't have any usable alternative profiles at the moment. That was something I changed. I have a patch I've been working that adds support for it. I've been sitting on my patch, but I should post it, and my cleanups to libx I'll get to it probably tomorrow. Sorry, tomorrow, 5 weeks, whatever.

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I do have ADHD, but that's longer than my usual side-tracks. If you run this example you will see that the values are never set and no error is returned about the invalid keys values chosen at random because they differ from the defaults :. I tested this with all combinations of ffmpeg 2. Profiles are not passed via xparams and require a separate CLI switch, added in Dec '17 as dc7d5f9ffaebab73f5de60f2cc The unpaired key-value issue concerns libavutil and requires that the value be always provided, as mentioned above.

Powered by Trac 1. Opened 5 years ago Last modified 20 months ago. Description Hi! Summary of the bug: When I'm trying to pass x parameters by using -xparams, multiple issues happen: Some parameters may be reported as "unknown". Without any warnings or errors see: ignore-report. How to reproduce: 1. Attachments 3 ignore-output. Oldest first Newest first Threaded. Comments only. Changed 5 years ago by kvssoft.


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