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 > Legacy Products > Pro Tools 10

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 07-24-2020, 12:30 PM
tfrazier1964 tfrazier1964 is offline
Member
 
Join Date: Aug 2000
Location: Gold Canyon, Az. USA
Posts: 37
Default PT10 import MP4 file plays back slow

Hi all I have PT10 system I imported a mp4 file we recorded for a Facebook live stream. We also recorded a PT10 16 track mix I wanted to edit and replace the mp4 audio track. However when I import the mp4 file into the project it plays back very slow. It seem there is a sample rate mistmatch. My project is in 48kHz and the mp4 audio stream is also 48kHz so should match without any conversion. What gives?

mp4 info:
Stream O
Codec +4264 MPEG-A AVC (part 10) (avc1)
Type: Video
Video resolution: E4Dx360
Buffer dimensions: 64Dx368
Frame rate: 29.967336
Decoded format:
Orientation: Top left
Chroma location: Left
Stream I
Codec: MPEG AAC Audio (mp4a)
Type: Audio
Channels: Stereo
Sample rate: 48000 Hz
Bits per sample: 32
AAC extension: S8R
__________________
Bradley Thomas Frazier[img]/images/graemlins/cool.gif[/img]

Jesus - He's Incredible
Reply With Quote
  #2  
Old 07-24-2020, 03:50 PM
Darryl Ramm Darryl Ramm is offline
Member
 
Join Date: Nov 2010
Location: USA
Posts: 14,931
Default Re: PT10 import MP4 file plays back slow

What gives is there *is* a sample rate mismatch. Either what you think was originally recorded at 48kHz is not or you are unintentionally changing that somewhere in your workflow, including maybe by applying SRC when you did not mean to.

These problems are always sample rate mismatches, you just need to work out what is going wrong. Nobody here can really guess for you.

An MP4 header saying what a sample rate is does not tell you that is what the sample rate really is. How did this actually get made?

Or dump that audio content out, guess what the real rate is and apply SRC when you import/copy in the audio.

Last edited by Darryl Ramm; 07-24-2020 at 04:16 PM.
Reply With Quote
  #3  
Old 07-25-2020, 07:24 AM
tfrazier1964 tfrazier1964 is offline
Member
 
Join Date: Aug 2000
Location: Gold Canyon, Az. USA
Posts: 37
Default Re: PT10 import MP4 file plays back slow

Thanks for the feedback.
I found the preferred solution was to convert the MP4 Video which had H264 and AAC to DNxHD and PCM at the same sample rate and bit size of my project.
This aligned correctly although the dnxhd video is HUGE.
__________________
Bradley Thomas Frazier[img]/images/graemlins/cool.gif[/img]

Jesus - He's Incredible
Reply With Quote
Reply

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 Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Weird error - PT plays back another file when importing from Sound Miner or Finder gastibarroule Pro Tools 11 0 06-06-2018 08:10 AM
Interleaved File import very slow from Workspace kenn.michael 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Mac) 55 08-03-2011 05:27 AM
Drag/Import Audio Plays Back Wrong moogboy100 Pro Tools TDM Systems (Mac) 0 07-15-2010 10:59 AM
Adat 48 Khz transfer plays back slow bossa 003, Mbox 2, Digi 002, original Mbox, Digi 001 (Win) 7 03-04-2005 02:16 PM
Bounced File Plays Back Slower Luky7Music Post - Surround - Video 2 09-11-2004 07:40 AM


All times are GMT -7. The time now is 04:55 AM.


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