ID 497714 - Audio recorded during Pitch is not in sync with the playthrough

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Problem summary
Audio recorded during Pitch mode is ahead of playthrough by roughly half a second at the start, then falls behind several seconds as the sequence plays through. The longer the recording, the more the audio falls behind. This is more noticeable in recordings longer than 3 and a half minutes.
This seems to be caused by the panel durations not being registered accurately.

Customer reported version
Flix 6.3.7

Customer reported platform
Windows 10

Steps to reproduce
1) Have a revision with 200 numbered panels.
2) Record a Pitch of you counting the panels as you go through them. To really highlight the issue, make sure you:

  • ALSO record your screen while recording the pitch in Flix.
  • FIRST go to the next panel, THEN call out the number you see.
  • Don't pause on panels and just move through them as you call them out.
Following these points should result in you getting a 3-4 minutes long recording.
3) Save the revision, and play it back.
You should already notice that the panel numbers are heard just before they actually appear in the Player, meaning the recording is a little ahead; as the sequence is reaching the middle, the recording seems to be in sync, however just past the middle there is nearly a whole panel difference, where the recording falls behind and calls out one number before the one that's actually showing; towards the end, the difference is even worse, with the recording being almost three panels behind.
4) Export a QuickTime from Flix.
5) Import the QuickTime and the screen recording in an editorial package, and place them one on top of the other on two separate tracks.

Expected behaviour
  • The playback counting the panels is in sync with the panels actually showing in the Player.
  • The screen recording and the QuickTime exported from Flix are in line.

Actual behaviour
  • The recording is slightly ahead of the panels at the very beginning, then gradually falls behing more and more as the sequence plays through.
  • The screen recording and the QuickTime are not in line

Reproduced by support
This bug has been reproduced in:
6.3.7 - macOS 10.14 Client - Windows 10 Client

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