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Old Aug 9, 2013, 04:46 PM   #1
dampsquid
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Puzzled: QuickTime performance on 2008 MP octal vs 2013 MBP

Just got a Gopro (love it) took video (1080 48fps) straight off card and copied to SSD drive on MP. Was surprised playback with QT stutters now and again. Scrubbing in QT is very jumpy. Copied same file to MBP and it's silky smooth, both in x1, faster, and scrubbing back and forth. Can't fault it.

Looked on Activity Monitor, found some significant differences:

MP: QT CPU ~18%, VTDecoderXPCService CPU ~130%, Disk read 3-4Mbit/s
MBP: QT CPU 15-18%, VTDecoderXPCService CPU 0%, Disk Read: 3-4Mbit/s

when the mbp stutters that coincides with both QT and VTDecoder' utilizations dropping significantly too.

Any one any idea why I'm seeing this difference in behaviour?

Configs:
MP: 2008 8 core, 2.8 GHz, 20GB, SSD boot, SSD scratch (where file is), spinning 'data' drive, HD5870
MBP: 10,1 2.3GHz i7, 16GB, factory SSD.
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Old Aug 10, 2013, 12:39 PM   #2
acearchie
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Quote:
Originally Posted by dampsquid View Post
Any one any idea why I'm seeing this difference in behaviour?

Configs:
MP: 2008 8 core, 2.8 GHz, 20GB, SSD boot, SSD scratch (where file is), spinning 'data' drive, HD5870
MBP: 10,1 2.3GHz i7, 16GB, factory SSD.
Have you tried playing it back in VLC?

I have had some issues a few times with older CPUs not playing back the video quite as well.

Are they the same OS and both up to date with software updates?
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Old Aug 10, 2013, 09:44 PM   #3
dampsquid
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Both machines are up to date on 10.8.4

VLC works fine on both machines, doesn't stutter on the mp like QT does. That said, it doesn't seem to skim as well as QT does.

What I'm hoping for is some insight into why the VTDecode... process is running at >>100% on the mp and 0% on the mbp...?
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Old Aug 11, 2013, 12:50 AM   #4
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Originally Posted by dampsquid View Post
What I'm hoping for is some insight into why the VTDecode... process is running at >>100% on the mp and 0% on the mbp...?
The MBP is using the GPU while the MP is using the CPU.
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Old Aug 11, 2013, 11:48 AM   #5
dampsquid
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Thanks for your reply. Can I ask, is that speculation on your part, or do you know it to be so? I wondered about that too -
Perhaps a remore pertinent question is can the mp be persuaded to use the HD5780?
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Old Dec 12, 2013, 08:40 PM   #6
phoneorpda
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I just had the same issue. has anyone found a solution for this?

A
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Old Dec 12, 2013, 09:39 PM   #7
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2008 MP doesn't have "quick sync", which basically decodes video on CPU with little performance hit. The new MBP also has a much nicer CPU in general. I hope that helps and you enjoy your camera :-)

http://en.wikipedia.org/wiki/Intel_Quick_Sync_Video
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Old Dec 12, 2013, 11:43 PM   #8
Policar
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I find gopro footage to play back very slowly, too, although the footage I used was 24fps 2.7k. It might be the codec.
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Old Dec 13, 2013, 01:50 AM   #9
phoneorpda
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is there any solution to this in an old MP (2009)?

every quicktime movie is stuttering and the VTDecoderXPCService process is hogging the cpu down to a crawl!
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Old Dec 13, 2013, 02:19 AM   #10
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Originally Posted by dampsquid View Post
What I'm hoping for is some insight into why the VTDecode... process is running at >>100% on the mp and 0% on the mbp...?

QT is using OpenCL. In other words QT is using the GPU if it is available and the CPU otherwise. Your new MBP has a GPU that OpenCL can use.

You could upgrade the graphic card on the MP to one that is supported by current versions of OpenCL. But the cost is very high. The card costs 1/4 as much as a new MP. You'd be better off selling the old MP and buying the new MP than dumping $1000 to $500 into an upgrade.
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Old Dec 13, 2013, 03:34 PM   #11
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Originally Posted by ChrisA View Post
QT is using OpenCL. In other words QT is using the GPU if it is available and the CPU otherwise. Your new MBP has a GPU that OpenCL can use.
QuickTime X does not use OpenCL or Quick Sync to decode the video data streams. QuickTime uses specialized units of the discrete or integrated GPU which decode the video data. That is the reason why QuickTime X supports the hardware accelerated decoding of H.264 data even on older (2009) integrated GPUs, like the NVIDIA 9400M. As you know, the 9400M does not support OpenCL and does not support Quick Sync.

AFAIK, Apple uses the Quick Sync decoder/encoder unit only for AirPlay video data streams. Nothing else.
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