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Forums Apple Final Cut Pro X Does audio time code frame rate effect playback in FCPX

  • Does audio time code frame rate effect playback in FCPX

  • james Lackleter

    February 16, 2014 at 10:47 pm

    Does audio time code frame rate effect playback in FCPX. I’ve seen too many threads stating counter opinions. Would like to just set the record with this one. Thanks.

  • Oliver Peters

    February 16, 2014 at 10:56 pm

    [james Lackleter] “Does audio time code frame rate effect playback in FCPX”

    What do you mean? Playback speed of the audio source file or of the project timeline? My gut feeling is no, but I also see TC that is suspect in terms of the correct numbers when I compare FCP 7, Premiere, FCP X and Media Composer. I trust 7 and MC as far as audio TC are concerned, though some of this might be dependent on the actual audio recorder.

    – Oliver

    Oliver Peters Post Production Services, LLC
    Orlando, FL
    http://www.oliverpeters.com

  • james Lackleter

    February 16, 2014 at 11:08 pm

    Hey Oliver, I mean in the project timeline. I here yes and no. From my tests it does not, but I may be wrong. It should not effect the source file correct?

    I ask this to clear confusion, and I have a clip that syncs in Avid without resampling, and the same one in FCPX does not sync and requires resampling. I’m trying to finish the project in FCPX as it’s almost done and I’d like to avoid recutting.

    Thanks

  • Paul Figgiani

    February 16, 2014 at 11:45 pm

    Hey James.

    Not trying to be snarky – but have you had a change of heart? I thought you hated everything about FCPX??

    “To Editors Thinking Of Switching to FCPX 10.1”

    -paul.

  • Oliver Peters

    February 17, 2014 at 12:11 am

    [james Lackleter] ” It should not effect the source file correct? “

    I wouldn’t think so either.

    – Oliver

    Oliver Peters Post Production Services, LLC
    Orlando, FL
    http://www.oliverpeters.com

  • james Lackleter

    February 17, 2014 at 12:51 am

    No I’m not a fan. There’s too many problems, but I do however have a nearly finished project in it that I’d like to finish in it. But yes I have a slew of posts with glitches I’ve come across, and the fact that XML transfer to Logic is useless is a biggie. But I’ve tried to leave behind as many solutions to problems that may be encountered to ease use for people forced by budget or w/e to use it.

    Anyway I would like to solve this timecode issue, so please any info is appreciated. I’m researching books now because internet forums are so flip flop on the issue to a question that should be simple. I called FCPX support and they didn’t seem to grasp the question as usual.

    I’m going to post on the Avid forum to see why it’s working in there, I’m assuming it’s doing something on import.

  • Walter Soyka

    February 17, 2014 at 1:22 am

    [james Lackleter] “Anyway I would like to solve this timecode issue, so please any info is appreciated. I’m researching books now because internet forums are so flip flop on the issue to a question that should be simple.”

    Frame rates for audio is like DPI for video.

    From a quick read of your other thread, it sounds like you changed the duration of your video by conforming it from 24.0 to 23.976, and now you want to change the duration of your dual-system audio to match — but you don’t want to resample it? You can’t do that, because math gets in the way.

    Duration = Number of samples / Sampling rate

    For your video, you changed the duration by changing the sampling rate (keeping the same number of frames, but interpreting them as 23.976 fps instead of 24.0 fps).

    For your audio, to change the duration, you must change the number of samples, the sampling rate, or both. However, you cannot practically change the sampling rate, so you must change the number of samples.

    Resampling is unavoidable in this case.

    Walter Soyka
    Principal & Designer at Keen Live
    Motion Graphics, Widescreen Events, Presentation Design, and Consulting
    RenderBreak Blog – What I’m thinking when my workstation’s thinking
    Creative Cow Forum Host: Live & Stage Events

  • james Lackleter

    February 17, 2014 at 1:33 am

    Thanks Walter, yes I’ve resampled it, and because it’s so minuscule I don’t mind doing it. How about the timecode then. It should not effect playback speed in anyway correct.

    Basically I can enter any time code frame rate I wish for audio, even if it’s wrong, let’s say 23.98 fps video with 30 ND audio timecode framerate, and it will make no difference in Avid or Final Cut in terms or playback and syncing correct?

    The only thing it’ll effect is the actual timecode numbers, but not playback. Correct?

  • Walter Soyka

    February 17, 2014 at 1:52 am

    [james Lackleter] “Basically I can enter any time code frame rate I wish for audio, even if it’s wrong, let’s say 23.98 fps video with 30 ND audio timecode framerate, and it will make no difference in Avid or Final Cut in terms or playback and syncing correct? The only thing it’ll effect is the actual timecode numbers, but not playback. Correct?”

    You said you did a test, right? It read like you didn’t believe your own results, so I wanted to provide a little justification for what you’re already seeing.

    I’m not in front of any NLE at the moment, but my point was that the only way it could possibly affect playback is if it were actually re-sampling the audio for you. You cannot keep the same audio samples and the same audio sampling rate but get a different duration.

    Mucking with the TC may have ramifications for interchange with other applications.

    Walter Soyka
    Principal & Designer at Keen Live
    Motion Graphics, Widescreen Events, Presentation Design, and Consulting
    RenderBreak Blog – What I’m thinking when my workstation’s thinking
    Creative Cow Forum Host: Live & Stage Events

  • james Lackleter

    February 17, 2014 at 2:49 am

    okay well that’s great, thanks for clarifying. So then Audio Timecode Frame Rate does not effect clip length or playback in Final Cut Pro X or Avid. I did a test importing different TC rates in Avid and all they all synced the same.

    I hope people take note of this thread when researching the topic, because there’s too many stating that playback is altered which is clearly false. The only way playback would altered is if you’re smart slating or jam syncing because the TC will be off.

    I’m wondering why the audio is syncing in Avid without resampling. Same deal, importing 24.00 FPS footage into a 23.98 timeline. Audio is syncing perfectly without resampling, even though I’m pulling down the frame rate. Any thoughts on why?

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