Can your iMac play this 4k movie trailer?


firedept

macrumors 603
Jul 8, 2011
5,606
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Somewhere!
It did not play fine on my late 2012 iMac 27" 3.4GHz i7 24 GB Ram with fusion drive. It showed 31% CPU usage. Was stuttering considerably.
 

b06tmm

macrumors regular
Jul 23, 2009
236
23
South Louisiana
Which trailer do I choose and how do I see my CPU usage?

I clicked play latest and downloaded it to my iMac first then played it in QT, no issues.

3.4 GHz Intel Core i7
16 GB 1333 MHz DDR3
AMD Radeon HD 6970M 2048 MB
 

StephenCampbell

macrumors 65816
Original poster
Sep 21, 2009
1,038
52
Huh, perhaps there's something wrong with the way that 4k file was created.

My machine can play at least four 1080p videos simultaneously, utilizing about 70% of the CPU. A new iMac should be able to do about twice that, right?

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Which trailer do I choose and how do I see my CPU usage?

I clicked play latest and downloaded it to my iMac first then played it in QT, no issues.

3.4 GHz Intel Core i7
16 GB 1333 MHz DDR3
AMD Radeon HD 6970M 2048 MB
No, it's in the list below, the only entry that has a 4K option on the righthand side. It's 420mb.
 

b06tmm

macrumors regular
Jul 23, 2009
236
23
South Louisiana
Huh, perhaps there's something wrong with the way that 4k file was created.

My machine can play at least four 1080p videos simultaneously, utilizing about 70% of the CPU. A new iMac should be able to do about twice that, right?

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No, it's in the list below, the only entry that has a 4K option on the righthand side. It's 420mb.
Downloading it now to try it, thanks!

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Huh, perhaps there's something wrong with the way that 4k file was created.

My machine can play at least four 1080p videos simultaneously, utilizing about 70% of the CPU. A new iMac should be able to do about twice that, right?

----------



No, it's in the list below, the only entry that has a 4K option on the righthand side. It's 420mb.
How do I show CPU usage?
 

WilliamG

macrumors G3
Mar 29, 2008
9,017
2,419
Seattle
I can't even get the site to load, but when it does I'll test it.

2012 3.4Ghz i7, 32GB RAM, 680GTX

*edit*

Site is working now.. Downloading trailer...

*edit*

Works fine. Between 14-20% CPU usage in Boot Camp Windows 7 using VLC.
 
Last edited:

StephenCampbell

macrumors 65816
Original poster
Sep 21, 2009
1,038
52
Downloading it now to try it, thanks!

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How do I show CPU usage?
In the Utilities folder in Applications you'll find the Activity Monitor app, which has a CPU tab where it'll show the percentage being used and the percentage idle.
 

firedept

macrumors 603
Jul 8, 2011
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454
Somewhere!
I tried viewing it in Firefox. Never tried to download it. Same thing here, first trailer would not even download to Firefox. 1080 would download in Firefox but was problematic playing it.
 

Bear

macrumors G3
Jul 23, 2002
8,089
4
Sol III - Terra
My 2006 Mac Pro stutters terribly trying to play this, but Activity Monitor shows only 30% of my CPU being used.

Can your iMac play the 4k trailer? Please also list the percentage of CPU being used as well as the year your machine was manufactured.

http://www.hd-trailers.net/movie/elysium/
Late 2009 iMac Sound is fine, image is stuttering and not moving. CPU for Quicktime was maybe 10% if that much.

For comparison, clean 1080P playback is 5.2% CPU usage for Quicktime.

I think Quicktime is running in multiple processes - in either case there was negligible load on the system even with the 4K trailer. I think it was just too much video data to handle.
 

b06tmm

macrumors regular
Jul 23, 2009
236
23
South Louisiana
OK, got it and it hung in three places every time I tried to play it. Most of the CPU usage was around 10% but spiked to 90% about 1/3rd through.
 

StephenCampbell

macrumors 65816
Original poster
Sep 21, 2009
1,038
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The thing is that my machine can play at least four or five 1080p videos simultaneously with no problem. I'm sure yours can do up to nine or ten.

I wonder what the issue is with playing this video...
 

Peace

macrumors Core
Apr 1, 2005
19,496
3,933
Space--The ONLY Frontier
The thing is that my machine can play at least four or five 1080p videos simultaneously with no problem. I'm sure yours can do up to nine or ten.

I wonder what the issue is with playing this video...
I'm still downloading it so all I can do is guess right now.

I'd say it's mainly due to being 4K. Doesn't 4K use 120MHz refresh on a display ?

Most displays can only handle 60 MHz.

I'm probably wrong but I'll look into it as soon as it's downloaded.


[edit]

I just played it with no problems. Even full screen.

My specs :

2012 15 " cMBP
2.6 GHz i7 w/ 16GB 1600 MHz DDR3 memory.
NVIDIA GeForce GT 650M w/ 1GB VRam
Thunderbolt display
SSD HD

I used Quicktime under OSX 10.9
 
Last edited:

WilliamG

macrumors G3
Mar 29, 2008
9,017
2,419
Seattle
I'm still downloading it so all I can do is guess right now.

I'd say it's mainly due to being 4K. Doesn't 4K use 120MHz refresh on a display ?

Most displays can only handle 60 MHz.

I'm probably wrong but I'll look into it as soon as it's downloaded.


[edit]

I just played it with no problems. Even full screen.

My specs :

2012 15 " cMBP
2.6 GHz i7 w/ 16GB 1600 MHz DDR3 memory.
NVIDIA GeForce GT 650M w/ 1GB VRam
Thunderbolt display
SSD HD

I used Quicktime under OSX 10.9
FYI, 4k is nothing to do with refresh rate (24hz, 60hz, 120hz, 240hz etc).
 

StephenCampbell

macrumors 65816
Original poster
Sep 21, 2009
1,038
52
I'm still downloading it so all I can do is guess right now.

I'd say it's mainly due to being 4K. Doesn't 4K use 120MHz refresh on a display ?

Most displays can only handle 60 MHz.

I'm probably wrong but I'll look into it as soon as it's downloaded.


[edit]

I just played it with no problems. Even full screen.

My specs :

2012 15 " cMBP
2.6 GHz i7 w/ 16GB 1600 MHz DDR3 memory.
NVIDIA GeForce GT 650M w/ 1GB VRam
Thunderbolt display
SSD HD

I used Quicktime under OSX 10.9
This is very interesting. Perhaps something needs to be set up within the OS to allow proper 4K playback, and Apple has included this in 10.9, naturally because they're going to be releasing 4k displays in the near future and what not.
 

WilliamG

macrumors G3
Mar 29, 2008
9,017
2,419
Seattle
This is very interesting. Perhaps something needs to be set up within the OS to allow proper 4K playback, and Apple has included this in 10.9, naturally because they're going to be releasing 4k displays in the near future and what not.

I'll reboot in a second and try it in OS X 10.8.4...

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OK so:

2012 iMac, 3.4Ghz, 32GB, GTX 680MX, Windows 7 64 bit, VLC:

14-20% CPU usage


2012 iMac, 3.4Ghz, 32GB, GTX 680MX, OS X 10.8.4 64 bit, VLC OR QuickTime:

~ 50%-150% CPU usage, depending on what's going on onscreen.

I see no difference in performance between VLC and QuickTime. CPU usage seems very high, but no dropped frames/stuttering, I checked the Media Information screen on VLC and there are no dropped frames. Looks perfectly smooth.

*edit*

Same results in Plex.
 

53kyle

macrumors 65816
Mar 27, 2012
1,275
92
Sebastopol, CA
My macbook pro 13 inch with the crappy intel hd 4000 played this just fine, but it might have to do with using os x 10.9. I was only using 5% of my cpu and about 50 mb of memory. I think that any iMac should handle it fine :)
 

StephenCampbell

macrumors 65816
Original poster
Sep 21, 2009
1,038
52
Were you playing the 4k, 420mb file?

If so, this is definitely looking like 10.9 allows for 4k playback and there's some kind of blockage in the software with 10.8 and before.
 

StephenCampbell

macrumors 65816
Original poster
Sep 21, 2009
1,038
52
This is seeming really random then... Why would new iMacs be unable to play 4k if the OS is not a limiting factor?
 

dakwar

macrumors 6502
Nov 2, 2010
310
1
Tried playing the 4K file on my black MacBook (2.4 GHz Core 2 Duo, 4GB DDR2 667, OS X 10.7.5), lol. Audio came in loud and clear. CPU stayed at 99% the whole time. Video was a clear while screen at the correct aspect ratio of the video file. ;)
 

cmanderson

macrumors regular
May 20, 2013
161
0
Tried playing the 4K file on my black MacBook (2.4 GHz Core 2 Duo, 4GB DDR2 667, OS X 10.7.5), lol. Audio came in loud and clear. CPU stayed at 99% the whole time. Video was a clear while screen at the correct aspect ratio of the video file. ;)
It played well on both my Retina MacBook Pro (Mid 2012 15") and Mac Mini (Late 2012). Both have the same Core i7 2.6 GHz Quad Core processor with HT. I tested it with and without Automatic Graphics Switching enabled on the rMBPro before testing it on the Mac Mini. It played well in all cases at several different resolutions. I'll test it on a 2011 iMac 27 (AMD 6770) later on.

OS X 10.8.4 on all machines.

1440x900 (Best for Retina), 2880x1800 (Native Resolution) and 3840x2400 (virtual resolution) all played the file the same without stutter (video or audio).

FWIW, the text overlay looked amazing on the retina display. Not so much on the Mac Mini with a 1280x1024 panel connected. ;)

Note I could not stream the file as I'm bandwidth limited (50 Mbps TW Cable "Wideband", what a joke to call it that.) It would stutter on both machines to the point of being unwatchable, even if I back stepped the video after it buffered about 1/3rd of the file.
 
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SandboxGeneral

Moderator emeritus
Sep 8, 2010
25,563
8,413
Detroit
I know you're asking about playback on the iMac, but I'm currently on the MBP and saw your thread.

cMBP 15" mid-2012
2.3 Ghz i7
16GB 1333 Mhz DDR3 RAM
NVIDIA GeForce GT 650M 512MB
Samsung 830 SSD (SATA3)
OS X 10.8.4

I downloaded the 4K and the 720p versions and played them in full screen with QuickTime.

The 4K played well and only stuttered a few times. CPU barely registered anything.
The 720p played well and never stuttered at all. CPU barely registered anything.