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stuttering youtube playback

is anyone else experiencing stuttering youtube video playback? i noticed this phenomenon right after updating to 10.7.3. when loading a youtube video, my CPU spikes to over 100% with the com.apple.qtkitserver process. audio seems to play but the video stutters until the entire video loads. once it is completely loaded, the video plays normally. furthermore, this phenomenon is isolated to only youtube videos, which i believe are only HTML5 and not flash. vimeo videos load and play back perfectly normal with no stuttering with either HTML5 or flash.

Mac mini 1.42GHz 1GB RAM, MBP 2.16GHz C2D 2GB RAM, iPhone, Mac OS X (10.5.1)

Posted on Feb 12, 2012 12:35 AM

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4 replies

May 1, 2012 10:50 PM in response to Peter Dy

I can't pinpoint when it started for me, but 10.7.3 sounds plausable. Here's how I solved it:


Safari menu->Reset Safari.


Can't believe how long it took me to try this, but it worked. I have no idea why it worked... you might think it had something to do with emptying the cache, but I had done that a few times previously to no avail. Hope that helps!

Apr 15, 2014 7:11 AM in response to Mighty5nake

I was experiencing very similiar issues. Youtube videos all of a sudden started playing jerky/stuttering and the sound was fine. Every other video site played fine. I tried the HTML5 change with Youtube. I un-installed Flash, reinstalled the latest version, updated everything, cleared everything out several times, then ran across this one simple comment by Rey Mo.


In my case every time I would try to hit "Safari menu -> Reset Safari." it freezes up and I have to hit "Force Quit." However, it still fixed the Youtube issue. Thanks for the tip.

stuttering youtube playback

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