I was curious about the apch deisgnation in the isadora media library, here is the explanation:

• Apple ProRes 422 High Quality: 'apch' ('hcpa' in little-endian)
• Apple ProRes 422 Standard Definition: 'apcn' ('ncpa' in little-endian)
• Apple ProRes 422 LT: 'apcs' ('scpa' in little-endian)
• Apple ProRes 422 Proxy: 'apco' ('ocpa' in little-endian)
• Apple ProRes 4444: 'ap4h' ('h4pa' in little-endian)

But because the cover was of it made the loading in Isadora go Down and it ran very Nice.  I delivered the computer for a rep and he told me that it was the logicboard witch trigger the fan on the computer that was broken. So it was over upheated...

hey Mark! It looks like the sporlight is ok. Here is a screen shot of the activity monitor when I run the film that is stuck when we run the show.

 Well, this is what I expect: VTDecoderXPCService using the most CPU, Isadora next, and one instance of IzzyMoviePlayer64 third. (IzzyMoviePlayer64 is the background app that plays the movie; but the hard work [decoding the pixels] is done by VTDecoderXPCService.)

What does it look like when things are fine? Similar?

Could it by any chance be a particular movie? Or is it truly random?

Best Wishes,
Mark

@mark

hey Mark! It looks like the sporlight is ok. Here is a screen shot of the activity monitor when I run the film that is stuck when we run the show.

It Might be a fan isue though or a combination of fan and something Else... I have checked the fan and was quite dirty....

The decoder comes on when I go into certain scenes in Isadora.

VTDecoderXPCService is part of the operating system. It is totally normal that it would appear when playing video, and it is is not unique to Isadora. Just open an Apple Pro Res movie in QuickTime Player X, play it, and look in the Activity Monitor app. I can't imagine this is part of the problem.

The thing I would want to know, since you say you're only playing one movie at at time: when the problem occurs, do multiple copies of VTDecoderXPCService exist and do they have a notable CPU% usage. For example, when I play the one APR movie in QuickTime Player X, I see this:

As you can see, only one of the instances of VTDecoderXPCService show a non-zero CPU %. If you were to consistently see more than one of these with a non-zero CPU %, then that would be a clue. (Note: you will briefly see two with a non-zero CPU % when you move from one scene to the next, as one movie finishes and the other begins.)

When you see the slowdown, do you see anything else with a high CPU % in Activity Monitor? One thing that can gum things up is spotlight. You can read about how to reset it and to get it to completely re-index your drive here. (Do this when you're going to lunch or dinner or something like that; it can take a while.)

Also beware when you see "kernel_task" with a high CPU %. If your Mac is running hot, the operating system will automatically start spending time in this task doing nothing to cool down the CPU. (I had this problem once because my laptop was filthy inside and the fans essentially weren't able to do their job.)

But after a while (i could not recreate it, seems to happen at random) the load starts rising. Somewhere around 70% the computer becomes completely unresponsive.

Are you manipulating the 'position', 'play start' or 'play length' inputs of the Movie Player with MIDI? Or any other Movie Player parameters?

It's a bit of a long shot, but you could also try setting Isadora Preferences > General > Frame Rate/Tasks > Display Rate Lock to Off instead of Scaled if nothing else works.

Best Wishes,
Mark 

Try loading the content from that scene in a fresh patch. If that works then its probably a problem with the patch, not the content. Then try loading another piece of content in the scene that has problems, if that also fails, then it must be the file.

I have checked now:

The decoder comes on when I go into certain scenes in Isadora.

Thats cool... I think I saw the Photo app somewhere in the activity monitor earlier to day, it might be that one coursing it... I will try it tomorrow morning.

VTDecoderXPCService

 I found this article that seems to point toward some browser video sandboxing:
https://apple.stackexchange.co...