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Activity Forums Apple Final Cut Pro Legacy 1080i/60 audio to 1080i/50 audio

  • 1080i/60 audio to 1080i/50 audio

    Posted by Jim Watt on April 11, 2008 at 7:07 pm

    I’m converting a bunch of one hour DVCPROHD programs from 1080i/60 to 1080i/50 in compressor using the 1080i50 DVCPROHD codec that’s listed there with audio pass through.

    I have 4 audio tracks and in the FCP 1080i/60 time line have selected 4 tracks mono and assigned each track to their respective channel.

    When I do the conversion I get 4 tracks, but track 3, which is a mix minus VO is blank, so obviously I have a problem in my conversion. The other 3 tracks seem to be fine.

    Since I have already done several of these could I as a temporary and relatively painless fix copy my 1080i/60 track 3 audio and paste it into my 1080i/50 timeline and will it work?

    Also if anyone has any idea why my conversion is dropping the Channel 3 audio i’d be most appreciative.

    thx…jw

    Michael Gissing replied 16 years, 1 month ago 2 Members · 7 Replies
  • 7 Replies
  • Michael Gissing

    April 11, 2008 at 9:42 pm

    On the assumption that your 60i to 50i conversion is real time & not a speed change, the audio from your 60i will sync with the 50i.

    Audio is 48khz so frame rates are not an issue as long as real time is maintained.

  • Jim Watt

    April 11, 2008 at 10:13 pm

    I thought that might be the case, but when I copy the 1080i/60 audio track and paste it on my 1080i/50 timeline it is short by a few seconds and out of sync.

    I tried syncing up one segment thinking that everything else should fall into sync, but that wasn’t the case it drifted out in just a few minutes.

    thx…jw

    Producer/DP, HD series, “Discoveries…America”, “Discoveries…Ireland”, “Discoveries…Spain”,
    “Discoveries…Argentina”

  • Michael Gissing

    April 11, 2008 at 10:27 pm

    You will need to export the audio track as an aif file. Dropping your NTSC QT file into the sequence is causing your sync drift.

  • Jim Watt

    April 11, 2008 at 10:44 pm

    I have the same problem with the exported aif file.

    Any suggestions?

    thx…jw

    Producer/DP, HD series, “Discoveries…America”, “Discoveries…Ireland”, “Discoveries…Spain”,
    “Discoveries…Argentina”

  • Michael Gissing

    April 11, 2008 at 11:00 pm

    Is compressor doing a real time frame rate conversion or a slow down from 60i to 50i? How quickly does the audio drift?

    If it is a speed change then the audio needs to be slowed 4%. Doing this properly would involve using external software like MPEX or Pitch & Time on an audio DAW to maintain pitch.

    I also have to ask why you are using compressor for this job. If it is a final master for broadcast then you are better using external hardware at a duplication facility to do the conversion which is not only real time & four audio but looks better.

  • Jim Watt

    April 11, 2008 at 11:07 pm

    We’re using compressor because we were under the impression the end product would be good. Also standards conversion at a post house is extremely expensive (54 hours of material) and the client doesn’t have the budget.
    thx…jw

    Producer/DP, HD series, “Discoveries…America”, “Discoveries…Ireland”, “Discoveries…Spain”,
    “Discoveries…Argentina”

  • Michael Gissing

    April 11, 2008 at 11:34 pm

    So rushes. I understand the budget issue as I work in docos.

    What about the question of frame rate versus speed conversion?

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