• Adobe Premiere Pro

  audio out of sync after export, can anybody help?

  Posted by Tristan Wira on December 3, 2008 at 8:23 pm

  HEy how you doin?,

  i have a little problem

  i want to export a sequence with h.264 mov file

  in the edit everythings seems fine and is on sync, when i export
  with h.264 encoder into quicktime it doesn’t. i use the following settings:

  25fps
  720 x 576 (4:3)
  aspect ratio: d1/dv pal
  bit depth: maximum
  no fields
  audio: 1 frame interleave

  picture quality is really good,audio too
  but it seems the longer i playback (in quicktime player) the more the audio gets out of sync…
  what i do notice is that the images that are out of sync move a lil bit slower then in the edit software

  can somebody tell me what i did wrong?

  Joe Marvelly replied 13 years, 2 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Joe Marvelly

  April 2, 2013 at 3:46 pm

  I realise this is a really late response but hopefully this answer will help anyone else who’s having the same problem!

  Sounds like the original audio file is of a different sample rate to the exported audio. Check the properties of the original audio file (Right click and select properties) and the sample rate will probably be either 44100Hz or 48000Hz. When exporting check the audio settings and make sure you set the sample rate to the same rate (44100 or 48000) as your audio file.

  Here are the effects of getting the sample rate wrong:

  Original audio – 44100Hz (44.1kHz, CD Quality)
  Exported Audio – 48000Hz (48kHz, Pro Video quality)
  Result: Exported audio is faster than the original and slightly higher pitched

  Original audio – 48000Hz (48kHz, Pro Video quality)
  Exported Audio – 44100Hz (44.1kHz, CD Quality)
  Result: Exported audio is slower than the original and slightly lower pitched

  What you should do is:

  If your original audio is 44100Hz:
  Original audio – 44100Hz
  Exported audio – 44100Hz
  Result – accurate playback

  or your original audio is 48000Hz:

  Original audio – 48000Hz
  Exported audio – 48000Hz
  Result – accurate playback

  Basically sample rate for audio is like the frame rate for video! If you have 10 frames for every second (fps) but play back 20fps the video will play back twice as fast as it was filmed! Hope this helps!

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