7 Replies Latest reply on Jul 25, 2010 11:50 AM by the_wine_snob

    Audio advanced by 3 frames when rendered

    acmputr

      Hi,

       

      Thanx in advance for your help.

      I'm using CS5 Production Suite.

      Cameras are:

      Sony FX1000

      Sony AX2000

      Sony V1U

      Sony SR11

      Canon 7D

       

      Sequences are created using an XDCAM HD 1080 30p preset.

       

      I'm shooting live music videos & all videos are shot in 30P (most tracks at 1920 x 1080 with the FX1000 at 1440 x 1080, all at 48 Khz stereo).

       

      The H.264 preset has been slightly modified to render at 1280 x 720  30P, audio is shot and renedered at 48 Khz stereo.

       

      In the editing window things are synched perfectly.  When I export to an MP4 file using the H.264 preset the audio gets rendered out of synch advanced by 3 frames.  If I go into the editing window and delay the audio by 3 frames it renders the output file in perfect synch.  This is true for on-camera audio tracks, multi-camera edited audio tracks and for tracks with imported audio wave files produced in Cubase by the sound engineer.

       

      Can someone help me understand why this renders out of synch?

       

      Thanx,

      Mel