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25th July 2006, 11:40 | #41 | Link | ||
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25th July 2006, 18:16 | #42 | Link |
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I tried adding grain. The improvement was very subtle. Noise didn't spread across the whole color band, but only made its edges "shimmer" quickly and didn't look like real dither at all. The source is very clean and perhaps that is its "problem".
ATM I'll stick to debanding, and of course keep the source MPEG-2. Does AVC include provision for generating noise on the decoder side only when needed without actually trying to encode the exact dither? Adding more noise to the whole picture is not an option. |
25th July 2006, 18:25 | #43 | Link | |||
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29th July 2006, 00:39 | #45 | Link |
Angel of Night
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Maybe you could try something like:
mt_average(AddGrainC(2),AddGrainC(2,seed=10)) Add in hcorr and vcorr if you really want them. Seed makes it constant across a video. This way the noise is somewhat stable and somewhat not. Or use the average plugin for finer weighting. (A plain screen pattern, ie no temporal randomness, just looks weird though.) There's a lot of very interesting things you can do with noise - search for noise factory for one of them. The noise should have different weightings depending on if it's a light or dark area, and detailed or smooth, and AVC grain deals with that. |
6th January 2007, 20:18 | #46 | Link | |
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Seems like these blocks are a issue for lots of others as well. (thought I was the only one) And thank you all for trying all the other options I jotted down to try, before I did (and prob made me yell and curse at everyone because it didn't work) Saves a hell lot of time Last edited by bananacreamandpeca; 6th January 2007 at 20:31. |
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6th January 2007, 20:29 | #47 | Link | |
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That last line was funny. I also use a trinitron monitor. Don't know about the quality. But seems alright to me. (CTX PR-711FL prob a cheaper trinitron model) |
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7th January 2007, 12:46 | #48 | Link | ||
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This is an old thread, there's an updated version of that matrix which I linked in the other thread you just started. Quote:
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7th January 2007, 21:53 | #49 | Link | |
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8th January 2007, 02:15 | #50 | Link | |
Silver Über Alles
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I find that adding grain during playback totally eliminates the blocking and i would really like to see some sort of option in the encoder to add grain during playback. I know this would mean that the decoder must be able to handle that feature?? and not sure how one would go about it. I am just very lucky that i find grain and noise as a great thing. Some people hate it ! |
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8th January 2007, 07:05 | #51 | Link |
interlace this!
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h.264 supports "film grain simulation" which does what you ask.
x264 doesn't support it, and most (all?) decoders don't. but it's likely to be supported in the future, when it becomes less fashionable to overfilter encodes.
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8th January 2007, 11:43 | #53 | Link |
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Am trying a few things of my own to reduce those nasty looking things in the output.
I was wondering. If turning deblocking to off. Would that make things worse when trying to reduce those blocks? Some say I should turn deblocking up Some say to lower the value to a negative value |
8th January 2007, 13:01 | #55 | Link | ||
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If I'm encoding from a clean uncompressed source without any blocking (as I have done once or twice to experiment), x264 deblocking matters a lot more. |
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9th January 2007, 01:33 | #56 | Link |
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I think all people who tries to do a details looks at coding results mast do a monitor calibration at first of all. Most of LCD monitors has a very very bad linearity compared to a cheap CRT. Calibration is a gamma at first than britness and contrast.
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12th January 2007, 05:23 | #59 | Link | |
Mr. Sandman
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CABAC does the same with the bitstream (well, cabac is a bit more complex than the zip/deflate algo though...) so it doesnt affect image quality at all.
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MPEG-4 ASP Custom Matrices: EQM V1(old), EQM AutoGK Sharpmatrix (aka EQM V2), EQM V3HR (updated 01/10/2004), EQM V3LR, EQM V3ULR (updated 04/02/2005), EQM V3UHR (updated 17/12/2004) and EQM V3EHR (updated 05/10/2004) Info about my ASP matrices. MPEG-4 AVC Custom Matrices: EQM AVC-HR Info about my AVC matrices My x264 builds. Mooo!!! Last edited by Sharktooth; 12th January 2007 at 05:27. |
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