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SMPTE 1 & 2 not available in Mac version
Posted: Tue Mar 15, 2016 18:52
by Oaktown
I just noticed that SMPTE 1 & 2 when enabled are not listed as options under transport when enabled on the Mac version of 5.0.2 (and 5.0.1 as well) but it works fine in Windows.
Re: SMPTE 1 & 2 not available in Mac version
Posted: Tue Mar 15, 2016 18:54
by Joris
You've got an audio track in that clip
Re: SMPTE 1 & 2 not available in Mac version
Posted: Tue Mar 15, 2016 19:14
by Oaktown
Got it! Thanks Joris.
Why couldn't I control a clip that has audio track using SMPTE since they are on different audio channels?
Re: SMPTE 1 & 2 not available in Mac version
Posted: Tue Mar 15, 2016 19:24
by Joris
Because SMPTE clock can refresh the clip position 30 times a second at the most. This is fine for video which plays back at 60 fps tops. The audio position plays back on average at 44.1 KHz, so it would need to be refreshed at least 20000 times per second in order to sound smooth.
Granted, we could interpolate the audio playhead when an audio track is detected, based on the previous SMPTE frame values. That would always be an approximation at best. Besides, it's such an edge case that we don't really want to put a lot of time into something which is not core functionality.
Re: SMPTE 1 & 2 not available in Mac version
Posted: Tue Mar 15, 2016 19:50
by Oaktown
Makes sense! Thanks for taking the time to explain the reasons.