Nexus One max AVC level

chipzoller · 24th April 2010, 00:12

Anyone know what the max level this device supports? I find conflicting reports online with some max at 1.3 and others higher.

nurbs · 24th April 2010, 10:41

I don't know, but the iPhone which uses a 600 MHz Cortex A8 can reportedly play HP@3.1 as long as the bitrate doesn't go to high, so I'd hope that the Nexus One with its 1GHz Cortex A8 should be able to do more than that.

me7 · 24th April 2010, 12:17

The iPhone/iPod doesn't use it's Cortex A8 for video decoding, it has a dedicated AVC-decoding chip. If the Nexus One doesn't have such a decoder and needs to handle AVC with software, 1.3 doesn't sound too low to me.

Dark Shikari · 24th April 2010, 12:23

Quote:

Originally Posted by me7

The iPhone/iPod doesn't use it's Cortex A8 for video decoding, it has a dedicated AVC-decoding chip.

No, it uses the C64x+ DSP that's part of the OMAP3.

Quote:

Originally Posted by me7

If the Nexus One doesn't have such a decoder and needs to handle AVC with software, 1.3 doesn't sound too low to me.

The iPhone can handle realtime SD decoding without using the DSP and the Nexus One is over 50% faster.

chipzoller · 25th April 2010, 06:07

Before I do some testing, what would be a likely "top level" for me to start with? High @ 4.1 out of the question?

yuvi · 25th April 2010, 09:44

Quote:

Originally Posted by Dark Shikari

No, it uses the C64x+ DSP that's part of the OMAP3.

iPhones don't use TI parts, they use Samsung SoCs. It's probably still a DSP though.

Anyway, the Snapdragon in the Nexus One claims to support 720p, so I'd guess level 3.1. Dunno what profile, Qualcomm is typical among mobile companies for not wanting to actually give useful details on their products.

Mr VacBob · 25th April 2010, 10:03

I looked through the iPhone system image once and failed to find an H264 software decoder for any sort of CPU. Although I didn't look in the drivers, so it's quite possible that I missed it.

chipzoller · 25th April 2010, 20:31

Baseline @ Level 3 works pretty well. I haven't tried 3.1, but High @ Level 3 is definitely out.

CruNcher · 25th April 2010, 20:52

Yep for Omap 3 Cortex A8 and the TI TMS320C64x+™ there are Software Decoding solutions that can playback as High as 720p 30 fps High Profile content with very nice bitrate upto 6 Mbits avg max 10 mbits

My Archos5IT has such a nice Software Decoder, i made some reference bitstreams to show the edge of smooth playback unfortunately bandwith on the server is currently exceeded

And i would say currently that's the best you can get on Omap3 3440 at least

of course new chips provide already 1080p, the Nexus one should be also capable of reaching this 720p 30 fps High profile and playback those reference streams fine.

The creator of this Decoder are surprise ex Indian TI employees http://www.ittiam.com/pages/products...omap3-720p.htm

It's a very nice Decoder they also fixed the x264 --weightp problems very fast back then when they occurred

chipzoller · 25th April 2010, 23:13

Are you suggesting the Nexus One should be capable of high profile? When I tried some tests it looked like it was dropping frames with a sample about @ 1.5 Mbit.

CruNcher · 1st May 2010, 11:15

Yes technically it should be though it depends on the used Decoder inside Android and how capable it is utilizing Qualcoms DSP

try this stream http://mirror05.x264.nl/CruNcher/for...s5IT/demo1.mp4
This runs flawless with ittiams Decoder on the Archos 5IT (DSP + Omap3 800Mhz)

24th April 2010, 00:12	#1 \| Link
chipzoller Mr. Woof Join Date: Jan 2002 Location: USA Posts: 784	Nexus One max AVC level Anyone know what the max level this device supports? I find conflicting reports online with some max at 1.3 and others higher.

25th April 2010, 20:52	#9 \| Link
CruNcher Registered User Join Date: Apr 2002 Location: Germany Posts: 4,926	Yep for Omap 3 Cortex A8 and the TI TMS320C64x+™ there are Software Decoding solutions that can playback as High as 720p 30 fps High Profile content with very nice bitrate upto 6 Mbits avg max 10 mbits My Archos5IT has such a nice Software Decoder, i made some reference bitstreams to show the edge of smooth playback unfortunately bandwith on the server is currently exceeded And i would say currently that's the best you can get on Omap3 3440 at least of course new chips provide already 1080p, the Nexus one should be also capable of reaching this 720p 30 fps High profile and playback those reference streams fine. The creator of this Decoder are surprise ex Indian TI employees http://www.ittiam.com/pages/products...omap3-720p.htm It's a very nice Decoder they also fixed the x264 --weightp problems very fast back then when they occurred __________________ all my compares are riddles so please try to decipher them yourselves :) It is about Time Join the Revolution NOW before it is to Late ! http://forum.doom9.org/showthread.php?t=168004 Last edited by CruNcher; 25th April 2010 at 21:13.

1st May 2010, 11:15	#11 \| Link
CruNcher Registered User Join Date: Apr 2002 Location: Germany Posts: 4,926	Yes technically it should be though it depends on the used Decoder inside Android and how capable it is utilizing Qualcoms DSP try this stream http://mirror05.x264.nl/CruNcher/for...s5IT/demo1.mp4 This runs flawless with ittiams Decoder on the Archos 5IT (DSP + Omap3 800Mhz) __________________ all my compares are riddles so please try to decipher them yourselves :) It is about Time Join the Revolution NOW before it is to Late ! http://forum.doom9.org/showthread.php?t=168004 Last edited by CruNcher; 1st May 2010 at 11:20.

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24th April 2010, 10:41	#2 \| Link
nurbs Registered User Join Date: Dec 2005 Posts: 1,460	I don't know, but the iPhone which uses a 600 MHz Cortex A8 can reportedly play HP@3.1 as long as the bitrate doesn't go to high, so I'd hope that the Nexus One with its 1GHz Cortex A8 should be able to do more than that.

24th April 2010, 12:17	#3 \| Link
me7 Registered User Join Date: Mar 2007 Posts: 217	The iPhone/iPod doesn't use it's Cortex A8 for video decoding, it has a dedicated AVC-decoding chip. If the Nexus One doesn't have such a decoder and needs to handle AVC with software, 1.3 doesn't sound too low to me.

25th April 2010, 06:07	#5 \| Link
chipzoller Mr. Woof Join Date: Jan 2002 Location: USA Posts: 784	Before I do some testing, what would be a likely "top level" for me to start with? High @ 4.1 out of the question?

25th April 2010, 10:03	#7 \| Link
Mr VacBob Registered User Join Date: Feb 2005 Posts: 140	I looked through the iPhone system image once and failed to find an H264 software decoder for any sort of CPU. Although I didn't look in the drivers, so it's quite possible that I missed it.

25th April 2010, 20:31	#8 \| Link
chipzoller Mr. Woof Join Date: Jan 2002 Location: USA Posts: 784	Baseline @ Level 3 works pretty well. I haven't tried 3.1, but High @ Level 3 is definitely out.

25th April 2010, 23:13	#10 \| Link
chipzoller Mr. Woof Join Date: Jan 2002 Location: USA Posts: 784	Are you suggesting the Nexus One should be capable of high profile? When I tried some tests it looked like it was dropping frames with a sample about @ 1.5 Mbit.