Avid Pro Audio Community

Avid Pro Audio Community

How to Join & Post  •  Community Terms of Use  •  Help Us Help You

Knowledge Base Search  •  Community Search  •  Learn & Support

Avid Home Page

Go Back   Avid Pro Audio Community > Pro Tools Post Production > Post - Surround - Video

Thread Tools Search this Thread Display Modes
Old 04-29-2015, 05:24 AM
SZE SZE is offline
Join Date: Oct 2008
Location: Worldwide
Posts: 87
Default Pro Tools HD 11 NTSC 23.976fps to Film 24fps sync problems


We have a 23.976 mix session that we need to convert/speed change to 24fps. No mix file or stems are available, so we have to do this change using the original full mix session with all original tracks, automation, etc.

A new 24fps session is created and the tracks are imported from the 23.976 session using the relevant 0.1% SRC pull up option.

We have done this exact same process in the past in Pro Tools HD 10 without problems, but upon doing it in Pro Tools HD 11 are encountering various issues:

1. After conversion, Pro Tools has inserted an additional 3.5 seconds at the start of the session

2. All audio and automation breakpoints, etc. appear to have been converted and speed changed correctly, although some clips play back in sync, some clips do not

3. Just to complicate things a little more, no 24fps master video is available, so we are playing back the 23.976 video at 24fps via the Avid video engine. There is a possibility that the subsequent sync problems are related to this, although having done the exact same thing in Pro Tools HD 10 where it worked correctly, it is a mystery

Any tips or pointers very welcome! Thanks
Reply With Quote
Old 04-29-2015, 08:18 AM
Kasper Kasper is offline
Join Date: Oct 1999
Location: Boston,MA USA
Posts: 939
Default Re: Pro Tools HD 11 NTSC 23.976fps to Film 24fps sync problems

Any reason you can't work in the original 23.976 session, print stems, then pull-up your "stem" session?

Lot less to worry about ..... no?

If you don't have a 24 FPS master to check sync, I wouldn't do it. (or at least tell your client you can't guarantee sync)
Also, throw in a head and tail pop for good measure.

Have you checked the clips in the orig session to see if they were ever in-sync, and are all original files the same sample rate?

Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
best way to go from 23.976FPS to 24FPS with a PT mix yazoo Post - Surround - Video 5 11-19-2013 10:11 AM
Working with a 24fps film Spin Girl Post - Surround - Video 5 05-01-2004 11:51 PM
Sync drift on FCP 4 23.976fps QT in PT 5.1.3 twarren Pro Tools TDM Systems (Mac) 5 01-30-2004 07:36 AM
sync problems: NTSC to 24P Darren Barnett Post - Surround - Video 1 03-02-2002 09:27 AM
24fps Film Comp -> PT -> 24fps Film Comp barden Post - Surround - Video 0 09-12-2001 08:09 PM

All times are GMT -7. The time now is 10:20 PM.

Powered by: vBulletin, Copyright ©2000 - 2008, Jelsoft Enterprises Limited. Forum Hosted By: URLJet.com