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Old 27th August 2009, 22:21   #221  |  Link
rack04
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Originally Posted by shon3i View Post
(bframes=3, keyframe interval and etc..)
One thing that threw me for a loop was --tune animation changing the default bframes 3 to bframes 5.
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Old 27th August 2009, 22:24   #222  |  Link
Dark Shikari
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One thing that threw me for a loop was --tune animation changing the default bframes 3 to bframes 5.
In general, tunings and presets can change things; if you absolutely need setting X to be set to value A, explicitly set it. Don't make assumptions of the defaults.
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Old 30th August 2009, 17:01   #223  |  Link
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Thank you I will see if I can get this to mux successfully when I get home (just got back from a Sony SXRD projector event - the wonders of optics in masking compression artefacts never ceases to amaze me). The idea of secondary video is pretty exciting.
This job would be a lot easier if everyone just stuck to CRT!

Given all the overdriven LCD displays with brighness set for daylight viewing but watched in the dark, pretty much all codecs need to have some low-luma range DQuant and even de-noise to reducing blocking-in-blacks. The video gamma curve the perceptual uniformity of a CRT, but that's out the window with LCD and plasma in the low luma range.
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Old 30th August 2009, 21:53   #224  |  Link
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This job would be a lot easier if everyone just stuck to CRT!

Given all the overdriven LCD displays with brighness set for daylight viewing but watched in the dark, pretty much all codecs need to have some low-luma range DQuant and even de-noise to reducing blocking-in-blacks. The video gamma curve the perceptual uniformity of a CRT, but that's out the window with LCD and plasma in the low luma range.
you havent gone and tryed to buy a reasonably priced HDTV recently (and by 'recently' i mean the last 2 or 3 Years)
then Ben?

you Cant buy anything competitive or even higher mid range and HD capable in the main UK retail outlets these days thats Not an LCD, even if you wanted to... perhaps its different in the US but not the EU.

Last edited by popper; 30th August 2009 at 21:58.
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Old 30th August 2009, 22:41   #225  |  Link
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you havent gone and tryed to buy a reasonably priced HDTV recently (and by 'recently' i mean the last 2 or 3 Years)
then Ben?

you Cant buy anything competitive or even higher mid range and HD capable in the main UK retail outlets these days thats Not an LCD, even if you wanted to... perhaps its different in the US but not the EU.
I'm well aware that the CRT is dead.

The problem is that the entire digital video delivery system still assumes CRT as a baseline. And we got lucky in that CRT and the human eye had a very similar gamma curve in terms of input level to perceptual value, and thus perceptual uniformity. But since LCD doesn't have the same characteristics, we get weird stuff in the low lumas.

And that's stuff that PSNR and SSIM aren't going to catch, since they also assume perceptual uniformity of the luma range.
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Old 31st August 2009, 11:57   #226  |  Link
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So what do you guys think about a slicing patch?

'cause I have one working, and it even works with one-MB-per slice at 1080p (8100 slices!). Fun fact: both my stream analyzers fail with that many slices; only ffh264 (compiled with MAX_SLICES=8192) and CoreAVC decode it correctly. JM works, but takes about 92 seconds per frame.

Speaking of which, is there any reason to have slices which consist only of horizontal bands and don't end in the middle of a row?

Last edited by Dark Shikari; 31st August 2009 at 12:30.
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Old 31st August 2009, 12:39   #227  |  Link
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So what do you guys think about a slicing patch?
I think the commercial encoders should be very, very, VERY afraid
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Old 31st August 2009, 13:07   #228  |  Link
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So what do you guys think about a slicing patch?

'cause I have one working, and it even works with one-MB-per slice at 1080p (8100 slices!).
Sounds like x264 is going to be another step closer to a fully Blu-ray compliant H264 encoder. Great work! I'm looking forward to this patch and I am totally excited about the weightp one that is hopefully coming soon .
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Old 31st August 2009, 13:16   #229  |  Link
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So what do you guys think about a slicing patch?
HAR, HAR, HAR ! (but I would keep the slice number a bit down )

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Old 31st August 2009, 13:22   #230  |  Link
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you Cant buy anything competitive or even higher mid range and HD capable in the main UK retail outlets these days thats Not an LCD, even if you wanted to... perhaps its different in the US but not the EU.
Popper, check out the high end Panasonic NeoPDP Plasma displays. They have a THX preset which is pretty accurate to D65/Rec.709 out of the box (colour is still a bit off, though). We've been harassing them for some time to add more calibration control though.

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So what do you guys think about a slicing patch?
I think the existence of this thread and the number of pages it's reached should answer that question
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Old 31st August 2009, 13:23   #231  |  Link
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Just gimme four ;-)
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Old 31st August 2009, 13:31   #232  |  Link
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I personally don't care about BD and thus I don't need slices. So I hope this won't effect Non-Sliced encoding.

But yes, it seems there is great demand for this in the "community"
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Old 31st August 2009, 13:37   #233  |  Link
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It would be very nice to be more compliant with blueray spec, and if it's an optional switch, it will not hurt anything
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Old 31st August 2009, 13:40   #234  |  Link
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...unless some efficiency and/or maintainability must be sacrificed to integrate slices support, which I hope isn't the case
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Old 31st August 2009, 18:48   #235  |  Link
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I personally don't care about BD and thus I don't need slices. So I hope this won't effect Non-Sliced encoding.
Well, there can be a latency advantage with slicing for both encode and decode. So there are cases beyond Blu-ray Level 3.1 where slicing could be a useful feature for live broadcasting and particularly conferencing.

I'm still doubtful that Level 3.1 will offer any perceptible quality advantage with 1080p24 content over Level 3.0.
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Old 31st August 2009, 19:10   #236  |  Link
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Sounds good to me. As I understand it, most players are perfectly happy without slices - but I'm always okay with better compatibility. "Most players" is a no-go if you're going to replicate discs

As long as it doesn't kill quality horribly! BluRay does have plenty of head room for bitrate

~MiSfit

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Old 31st August 2009, 19:23   #237  |  Link
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I'm still doubtful that Level 3.1 will offer any perceptible quality advantage with 1080p24 content over Level 3.0.
Level 4, you mean. And surely it would matter with some H.264 encoders on some very noisy, high-motion material...?
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Old 31st August 2009, 20:09   #238  |  Link
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Well that is good news indeed, this should be done long time ago
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Old 31st August 2009, 21:51   #239  |  Link
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Level 4, you mean.
Yes, sorry.

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And surely it would matter with some H.264 encoders on some very noisy, high-motion material...?
At 1080p24? 25 Mbps is a lot of bits per pixel at 1080p24. 1080i30 I could see cases where it would matter, particularly without MBAFF in x264. But I'd want to see some real-world examples where there's a noticible visual improvement with 1080p24.
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Old 31st August 2009, 22:28   #240  |  Link
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Multi-slice encoding support

Last edited by Dark Shikari; 31st August 2009 at 23:13.
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