x264 and slicing

[LoRd_MuldeR]

Originally Posted by check

What's the point of this test if you won't compare ffdshow against its main competitor?

It proves that ffdhow-mt handles files that CoreAVC cannot decode at all. Also I had DivX in the test, which is a pretty fast competitor too.

But to complete the test, I will run a new test with another sample...

[LoRd_MuldeR]

Here we go:

E:\HD\PlanetEarthSample_1080p.mkv

[ffdshow ICL r2335]
User: 42s, kernel: 10s, total: 53s, real: 277s, fps: 188.7, dfps: 36.1
User: 42s, kernel: 8s, total: 50s, real: 282s, fps: 197.4, dfps: 35.4   <-- 100%
User: 41s, kernel: 9s, total: 51s, real: 285s, fps: 194.6, dfps: 35.0

[ffdshow-mt r2333]
User: 40s, kernel: 0s, total: 40s, real: 93s, fps: 246.2, dfps: 106.8
User: 41s, kernel: 0s, total: 41s, real: 93s, fps: 240.3, dfps: 106.8   <-- 302%
User: 39s, kernel: 0s, total: 39s, real: 93s, fps: 251.5, dfps: 106.7

[CoreAVC v1.8.5]
User: 17s, kernel: 0s, total: 17s, real: 70s, fps: 586.1, dfps: 142.0
User: 18s, kernel: 0s, total: 18s, real: 70s, fps: 542.8, dfps: 142.3   <-- 402%
User: 17s, kernel: 0s, total: 17s, real: 70s, fps: 566.9, dfps: 142.4

[DivX H.264 Decoder Beta-3]
User: 26s, kernel: 0s, total: 26s, real: 62s, fps: 375.8, dfps: 160.6
User: 22s, kernel: 0s, total: 22s, real: 62s, fps: 441.1, dfps: 160.9   <-- 455%
User: 20s, kernel: 0s, total: 20s, real: 61s, fps: 478.3, dfps: 163.6

Conclusion:
DivX H.264 > CoreAVC > ffdshow-mt >> ffdshow

Surprising that DivX H.264 is actually faster than CoreAVC on that sample. Again we see the enormous improvements in ffdshow-mt/ffmpeg-mt

Also ffdshow-mt allows "real time" playback of this 1080p sample, which is the most important point I think

[toboda]

Thanks Lord Mulder for the link. I'm testing Inlets Fathom encoder atm although I'd love to use x264 for this project.

[toboda]

Do I have to set special options to enable NAL or is it just happening when I use the patched version with megui?
Thx

[shon3i]

Originally Posted by toboda

Do I have to set special options to enable NAL or is it just happening when I use the patched version with megui?
Thx

you need to put on extra commandline options -nal-hrd

[kemuri-_9]

Originally Posted by shon3i

you need to put on extra commandline options -nal-hrd

--nal-hrd also depends on vbv being active,
but you should already have that enabled if you're encoding for BD

[Sharktooth]

Originally Posted by toboda

Do I have to set special options to enable NAL or is it just happening when I use the patched version with megui?
Thx

if you're going to use megui, it already comes with a patched version of x264 AND blu-ray presets ...

[Willyfan]

Originally Posted by kolak

As far as I know all PRO encoders do 4 slices.
Scenarist/Blu-print won't flag (99% sure) slicing problem, but Sony's verifier will.

Scenarist check during the import file step the file compliance, and x264 files are NOT COMPLIANT with bluray specs, because bluray need 4 slices in 4.1 level. I not understand why the people here don't want slices in x264: Is possible to add a parameter for number of slices. For all people don't like slices, the default can be "1". Beside, is not necessary to use slices for multithread encoding (but is necessary for decoding, I guess, expecially on first generation bluray player).
William

[Dark Shikari]

Originally Posted by Willyfan

Scenarist check during the import file step the file compliance, and x264 files are NOT COMPLIANT with bluray specs, because bluray need 4 slices in 4.1 level. I not understand why the people here don't want slices in x264: Is possible to add a parameter for number of slices. For all people don't like slices, the default can be "1". Beside, is not necessary to use slices for multithread encoding (but is necessary for decoding, I guess, expecially on first generation bluray player).
William

As I have said, I will consider adding slicing support to x264 when ffmpeg-mt is committed. I simply do not want to risk creating an environment where people consider slicing to be an obligatory part of creating an ordinary video with x264. Such a thing creates even less of an incentive for decoder developers to include useful multithreading capabilities and needlessly cripples compression, if only a little.

I might reconsider if someone can find me a Blu-ray player that can't play an unsliced stream.

[Willyfan]

Originally Posted by Dark Shikari

As I have said, I will consider adding slicing support to x264 when ffmpeg-mt is committed.
......
I might reconsider if someone can find me a Blu-ray player that can't play an unsliced stream.

It's hard to find a bluray player that can't play unsliced stream, because actually is impossible (with professional products) author a bluray with unsliced stream. I'm using Scenarist, and Scenarist DON'T IMPORT in the scenario a x264 file, so I can't try to make a bluray disk in order to find the bluray player that don't work with that disk.
Anyway, when slicing support will be added to x264 I'll be very happy to try H264 files generated with x264. I'm very interested to x264 for speed and quality. Actually I'm using a VC1 encoder, written "in house" using mainconcept SDK, And I'll like to compare the quality of this 2 encoders.

[Dark Shikari]

Originally Posted by Willyfan

It's hard to find a bluray player that can't play unsliced stream, because actually is impossible (with professional products) author a bluray with unsliced stream. I'm using Scenarist, and Scenarist DON'T IMPORT in the scenario a x264 file, so I can't try to make a bluray disk in order to find the bluray player that don't work with that disk.

Then how in the world have people reported successfully making Blu-rays using Scenarist and x264?

Originally Posted by Willyfan

Anyway, when slicing support will be added to x264 I'll be very happy to try H264 files generated with x264. I'm very interested to x264 for speed and quality. Actually I'm using a VC1 encoder, written "in house" using mainconcept SDK, And I'll like to compare the quality of this 2 encoders.

There's a slicing patch on the mailing list that claims to support up to 4 slices, and reports have confirmed that it may potentially work. I cannot guarantee anything.

[Willyfan]

Originally Posted by Dark Shikari

There's a slicing patch on the mailing list that claims to support up to 4 slices..

I'm sorry, where I can found this patch? I can try this one now.
Many thanks!!

[Dark Shikari]

Originally Posted by Willyfan

I'm sorry, where I can found this patch? I can try this one now.
Many thanks!!

Note how old this patch is. It probably will not patch cleanly.

[Willyfan]

As yoy say, the patch is not cleanly. Tomorrow morning I'll try to modify by hand the part unsuccesful.
Many thanks