OK, what about the audio realtime thread (during playback). It should be running at pri 97 -- is this true while the glitches are happening?
Doug # sent from my iPhone > On Dec 26, 2015, at 14:40, Michael McNeela <[email protected]> wrote: > > 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]> 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]> wrote: >>>>> >>>>> On 26 Dec 2015, at 16:48, Cyril Blanc <[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]> 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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