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Stuttering videos on iMac i5 2.5GHz mid 2011 El Capitan

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akira54:
I noticed quite a bit of "stuttering" when the camera is panning. Is there anything I can do about this in the settings? When I switch to W7 in bootcamp on the same machine I do not have this problem, but I would prefer to remain in "native" mode. Suggestions would be appreciated. The only thing I have tried so far is to enable hardware acceleration, but it made no difference.

akira54:
I investigated a little further and looked at the same video in Windows bootcamp and is was smooth as silk there. Nothing else was running on OSX (El Capitan), no backups or internet access and I only re-installed El Capitan, like MC21, from scratch a few days ago. To show the problem I have uploaded a short video filmed with my phone. You can download it here: https://ln.sync.com/dl/c0c21b510#bydayh3w-2pka9vms-823uwvzb-e5pjawyu

PS. The 1.17 Mb upload limit here is silly.

Hendrik:
A 2011 iMac isn't the most powerful machine one might imagine - what kind of videos are you playing? Did you try any lower resolution videos to check if its just a performance issue?
Unfortunately we don't support Hardware Accelerated decoding on a Mac yet.

akira54:
Playing videos should not require "the most powerful machine imaginable"  ;) and all I was trying to play was a scaled down TV documentary. Moreover, it played flawlessly under Windows 7 on the same machine (bootcamp).

Hendrik:
Without having access to a particular machine I cannot help you, as every system is different, especially if performance could be a factor, so please try to answer the questions.

- What kind of video are you playing? Width/height/codec? Is it interlaced?
You can get detailed information with MediaInfo (https://mediaarea.net/nn/MediaInfo/Download/Mac_OS)

- Does the same problem happen with different videos? All of them? Just some?

- Can you check CPU usage while playing to check for performance constraints?

- Which OSX are you using? 64-bit?

Video playback is entirely different on Windows, so comparing to that is not very conclusive.

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