Hey Doug > Your matrix makes me wonder: are you trying to play from a launchd daemon?
Yep; a launchd LaunchAgents daemon (i.e. not running as root) > Try taking an Instruments trace that captures thread scheduling activity. It > sounds like the daemon is in a throttled state, which would show in a kernel > or Instruments trace as having its threads running at a very low priority. A short ~5 second trace seems to show the main thread via launchd consistently at priority 31, vs the main thread via ‘double-click to open’ at priority 46-47. (All other threads seem to have the same priorities regardless of how the app’s launched though) Michael +447595247282 > On 26 Dec 2015, at 18:34, Doug Wyatt <[email protected]> wrote: > > Hi Michael, > > Your matrix makes me wonder: are you trying to play from a launchd daemon? > > Try taking an Instruments trace that captures thread scheduling activity. It > sounds like the daemon is in a throttled state, which would show in a kernel > or Instruments trace as having its threads running at a very low priority. > > Doug > > > >> On Dec 26, 2015, at 10:11 , Michael McNeela <[email protected] >> <mailto:[email protected]>> wrote: >> >> Should you be curious, here’s what I’ve tried narrowing down so far; >> >> <Screen Shot 2015-12-26 at 18.06.39 copy.jpeg> >> >> Michael >> 07595247282 >> >>> On 26 Dec 2015, at 16:55, Michael McNeela <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>>> On 26 Dec 2015, at 16:48, Cyril Blanc <[email protected] >>>> <mailto:[email protected]>> wrote: >>>> >>>> Where are your video files ? >>> >>> On the internal SSD >>> >>>> What Mac do you use ? >>> >>> A late 2014 Mac mini (Macmini7,1), factory-configured to 2.6 GHz i5, 8GB >>> RAM, 256GB SSD. The issue presents itself on three Macs of the same >>> hardware configuration (bought & configured at roughly the same time), >>> across 10.10.3, 10.10.5 and 10.11. I’m puzzled. >>> >>> Michael >>> 07595247282 >>> >>>>> On 26 Dec 2015, at 16:50, Michael McNeela <[email protected] >>>>> <mailto:[email protected]>> wrote: >>>>> >>>>> Thanks for the input everybody. I should clarify that I’m simply playing >>>>> regular ol’ video files using Cocoa’s AVPlayer; nothing spectacular, and >>>>> the video playback continues unaffected as the audio stutters and drops. >>>>> It’s incredibly odd. >>>>> >>>>> Oh, and audio is being outputted through the Mac’s headphone port; not >>>>> external audio interface via USB/FireWire, etc. >>>>> >>>>> I’ve stopped SSH attempts bumping the CPU, just in case they were >>>>> related, but the issue persists, so now I’m at a loss. >>>>> >>>>> Michael >>>>> 07595247282 >
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