Cody_Jordan
Active member
Hello DVXusers, I challenge everyone in this forum to help me solve this problem. I only post after hours of searching forums and doing reseach on my on... I'm at a dead end here and I need my DVX crew to back me out.
I'm experiencing the mysterious "audio drift" in FCP HD with 16mm footage. I've done everything every forum and article has told me to do and yet no synced audio.
Our project details:
We shot a music video on Super 16mm @ 24fps. We had the band play along with their previously mastered song (44.1k sample rate) perfectly in sync (due to the amazing drummer). We processed the film onto digi-beta at the lab. Then we had the digi-beta captured via FCP HD all at once onto our firewire drive - thats 18mins of footage in one .mov file. (20gigs total uncompressed) This transfer was done at a top notch production studio with skilled technicians so I highly doubt anything went wrong there.
We took the 29fps .mov file from our drive and ran it through Cinema Tools to remove the pulldown. (processing F1-F2 field_C) We put the resulting 23.98 .rev file into a 720X480 timeline with DV/DVCPRO codec. Then rendered the uncompressed .rev file from 720X486 (thanks digibeta) to 720X480 with the DV codec. Then we took the FCP rendered file and placed it in the timeline.
The next step was the audio.. We brought in a 44.1k uncompressed .wav of the song that was played during filming and placed it in the timeline. Its in sync in the beginning then drifts off about 15 seconds later and worsens until the end. The problem is the song is eactly 3 minutes long, but the video comes out to 2:55. So basically, the video plays faster and finishes 5 seconds before the song ends.
I later took note of the audio's sample rate conversion to match the pulldown removal of the video: 44.1k converted to 44.056k. However, its still out of sync with the remaining 5sec difference at the end. Also, there is no visible difference between the two sample rates once placed on the timeline... Keep in mind that I've tried several difference sample rate conversions.
What am I doing wrong? Is it the audio? or is it Cinema Tools?
On every step I've weighed out my options and taken care to make the right decision. And we've spent so much time and money to get here - now how do I bring it all together?
This is where I need some council dvxusers... thanks in advance.
I'm experiencing the mysterious "audio drift" in FCP HD with 16mm footage. I've done everything every forum and article has told me to do and yet no synced audio.
Our project details:
We shot a music video on Super 16mm @ 24fps. We had the band play along with their previously mastered song (44.1k sample rate) perfectly in sync (due to the amazing drummer). We processed the film onto digi-beta at the lab. Then we had the digi-beta captured via FCP HD all at once onto our firewire drive - thats 18mins of footage in one .mov file. (20gigs total uncompressed) This transfer was done at a top notch production studio with skilled technicians so I highly doubt anything went wrong there.
We took the 29fps .mov file from our drive and ran it through Cinema Tools to remove the pulldown. (processing F1-F2 field_C) We put the resulting 23.98 .rev file into a 720X480 timeline with DV/DVCPRO codec. Then rendered the uncompressed .rev file from 720X486 (thanks digibeta) to 720X480 with the DV codec. Then we took the FCP rendered file and placed it in the timeline.
The next step was the audio.. We brought in a 44.1k uncompressed .wav of the song that was played during filming and placed it in the timeline. Its in sync in the beginning then drifts off about 15 seconds later and worsens until the end. The problem is the song is eactly 3 minutes long, but the video comes out to 2:55. So basically, the video plays faster and finishes 5 seconds before the song ends.
I later took note of the audio's sample rate conversion to match the pulldown removal of the video: 44.1k converted to 44.056k. However, its still out of sync with the remaining 5sec difference at the end. Also, there is no visible difference between the two sample rates once placed on the timeline... Keep in mind that I've tried several difference sample rate conversions.
What am I doing wrong? Is it the audio? or is it Cinema Tools?
On every step I've weighed out my options and taken care to make the right decision. And we've spent so much time and money to get here - now how do I bring it all together?
This is where I need some council dvxusers... thanks in advance.