Audio Drift on Exports (Screenflow 6.2.2)
Hi! Just wanted to find out if this is a known issue:
I have several 1+1/2hr screenflow 6.2.2 projects composed of a wide variety of imported files and screen recordings. Projects play in realtime no problem, with great audio sync. Exporting Prores 422HQ at 30fps works ok, but exporting Prores 422HQ at 29.97 yields significantly audio-drifted renders.
I haven't so far found this issue on the forums.
MacBook Pro (Retina, Mid 2012)
2.6 GHz Intel Core i7
16 GB 1600 MHz DDR3
Intel HD Graphics 4000 1024 MB // Nvidia GeForce GT 650M
I'm compressing the exported renders at 29.97, so I'd rather render at 29.97 to begin with. Regardless, I lost a day trying to figure out what the cause of the problem was. There's no way to determine the working framerate for editing, but any video renderer should have 30, 29.97, 24, 23.976 export options, and they should probably function, so I figure this is an oversight/bug. ;)
The workflow it's destined for is as master for compression.
The audio drift is noticeable as soon as there's any audible cue, or a cut. It's off by a small but noticeable amount in the beginning, and proceeds to wander to the point that it's off by at least a full second after 30 or 40 minutes.
Thanks for the help, Craig!Reply
Carey Smith said:
any video renderer should have 30, 29.97, 24, 23.976 export options, and they should probably function
It would seem picking NTSC compatible frame rates in ScreenFlow would otherwise result in audio drift.
It's important for us to know what you're using as a player. Are you playing in Quicktime X or an NLE, something else?
Players and NLEs do handle differently as an NLE will try to lock to an NTSC compatible frame rate normally whereas a file player may not.Reply
Carey Smith Thanks for that.
I'd ask you to test with a free trial of ScreenFlow 7.1.1 but you'd have to move to an OS compatible with that. I want to check if this is fixed in the current version of ScreenFlow.
Development on the 6 series has ended and even if there were a bug fix it likely wouldn't be compatible with Yosemite. There is a ScreenFlow 6.2.3 you could test but that also require El Capitan (10.11.x) at a minimum compatible OS but I can't promise a fix will happen in the 6 series.
Let me know if you can test 7.1.1 on 10.11.x and up. If not, I understand. I can still have you report the issue and provide the steps so we can test in 7.1.1. If it's still an issue we can investigate a fix so you'd know when upgrading would make sense for you.Reply