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31st October 2005, 20:41 | #21 | Link | |
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31st October 2005, 20:41 | #22 | Link | ||
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31st October 2005, 20:46 | #23 | Link |
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Then I'm completely wrong. Strange, I would have thought it was working as the decoding process.
But then, nothing prevents you from multiplying all values by three in Sharktooth matrices , and adapting deblocking accordingly
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31st October 2005, 20:54 | #24 | Link | |
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31st October 2005, 21:11 | #25 | Link |
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Your remark could apply to any CQM ( edit : which differs a bit too much from the flat one ). Perhaps lambda / skip decision could be made according to matrices coefficients ( normalizing thresholds / lambdas by the sum of the coefficients or something alike )
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3rd December 2005, 17:12 | #27 | Link | |
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3rd December 2005, 17:28 | #28 | Link |
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Actually, you can take into account the SAR by tweaking the CQM, because horizontal and vertical frequencies won't behave in the same way. So theorically, CQM makes SAR usage even more suitable. Theorically only though ( creating the proper matrix is another matter, quite complicated )
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3rd December 2005, 20:19 | #29 | Link |
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Default quantization or flat matrices should be more appropriate for anime.
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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!!! |
30th December 2005, 04:07 | #30 | Link |
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I'm doing 720p encodes of captured HDTV material. I'm using the Sharktooth full x264 builds and x264-MeGUI using the HQ-Slow preset at about 6Mbps. Is this matrix something that would benefit me? Or is there something else I should possibly be looking at? I don't have any issues with my encodes, but am always on the lookout for improvements.
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30th December 2005, 04:48 | #31 | Link |
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Well, the general rule is to use low bitrate matrices with HD sources but 6mbp is relatively high for h.264.
So yes, it may be worth a try. Post your findings though
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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!!! |
30th December 2005, 04:54 | #32 | Link |
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Well, honestly, 6Mbps was just a guess, I didn't want to post a "what is a good bitrate for x264 at 720p" but since you brought it up...what might a good starting point be? The sources are all typical movies, sources are 1920x1080@29.970. I resize (and deinterlace if necessary) to 720p@23.976fps. I honestly have no idea where to begin for bitrates for these HD encodes.
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30th December 2005, 05:25 | #33 | Link |
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1500kbps is a good starting point for sources with good compressibility at 1280x720 @ 23.976fps.
Higher bitrates are needed if noise or grain is present or if compressibility is lower (action movies for example). Obviosly that's subjective... but artifacts on HD stuff are much less visible. Use a quality preset (like HQ-Slower for MeGUI) or if encoding time is a problem just rise the bitrate and use a faster preset.
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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; 30th December 2005 at 05:27. |
30th December 2005, 06:15 | #34 | Link |
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Wow
I didn't realize that I could get away with such a low bitrate for HD content! Well, that'll be good, I tried the bits/pixel calculator on the bitrate tab of the newest GKnot and it showed I'd need a minimum of 3500Kbps to get the 0.190bits/pixel. I guess it's a bit outdated for x264? Either way, I'm stoked, now how about for DVD->x264 (my Emily Rose DVD is 720x288@23.976)?
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30th December 2005, 13:53 | #35 | Link | |
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Against this rule can go the fact, that with downsizing from HD to SD you can accidentally get rid of some film grain, which increases the compressibility. As always it depends on source. I personally do not see any special reason to squeeze a full length movie 1280x??? smaller than 1 DVD size. For instance one of my test: wmv3 6.5Mbps 1440x820ANA -->Quite heavy denoising and deblocking --> 1280x544 --> x264 4200kbps IIRC the avg quant was some around/below 20 with flat (not sure) w/o deblocking filter. Last edited by redfordxx; 30th December 2005 at 14:06. |
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30th December 2005, 14:04 | #36 | Link |
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Sharktooth,
you have obviously a lot of testing with your matrix behind. Do you have any experience with your matrix, on which quantizer (and below) the blocking disappears (or other artifacts --- ringing, nonsharpness). With the filter deblock off if you know --- I have to encode the HD with the filter of, otherwise the playback eats too much CPU. |
30th December 2005, 19:56 | #37 | Link |
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It really depends on the source.
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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!!! |
17th May 2006, 02:44 | #38 | Link |
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Sharktooth, are you developing anymore AVC quantization matrices, like you said in your first post? I don't mean to be nosy or anything, I just use your matrix alot and I am curious if there is anything in development.
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17th May 2006, 03:22 | #39 | Link |
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Yes, im still experimenting with matrices. Im trying to fine tune HR and LR is in preliminary testing phase... but that's not as easy as for mpeg4 ASP
however i think i'll rename them... both.
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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!!! |
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