1 2 Previous Next 21 Replies Latest reply: Nov 12, 2011 2:22 PM by rasu
rasu Level 1 Level 1 (0 points)

I've shot some video on my DSLR (Canon 5dm2) and recorded audio separately on Zoom H4n at 44.1khz. If I shoot the video at 24fps is syncs perfectly using the auto sync function in the event's window. However, if I shoot the video at 25fps it won't sync.

  • 1. Re: Why won't the audio sycn at 25fps?
    f8photography Level 1 Level 1 (0 points)

    I have the exact same problem, all my recent work at 25fps cannot be synced with my Zoom H4n files at all, however, on messing around with the camera and zoom, i put it to 24pfs and the zoom to 44.1khz at 24bit, it synced perfectly....great, however, i want to shoot at 25fps....there must be a way?  I even tried to convert the 25fps footage via various softwares to conform to 24fps and sync it that way....no good....doesnt work at all, is FCPX only suited to 24fps or have i missed something?

  • 2. Re: Why won't the audio sycn at 25fps?
    rasu Level 1 Level 1 (0 points)

    I have tried everything to resolve this with no luck so I am still waiting to find out what to do. Another problem which I will post separately is that even when you do shoot at 24fps 1080 after syncing with the audio in the Event browers the resultant compound clip converts to 720p. Have you had the same experience with that?

  • 3. Re: Why won't the audio sycn at 25fps?
    f8photography Level 1 Level 1 (0 points)

    Yes, I have the same problem.  I did find a workaround though.  I converted all my 25fps clips to 23.98 using a batch sequence in the new compressor, then they could be synced up with the audio, but still only to 720.

     

    Seems there is a lot of improvements required, I am sure this software will be great in about a year once they fix everything they should have done before they happily took our cash!

  • 4. Re: Why won't the audio sycn at 25fps?
    Thomas Emmerich Level 4 Level 4 (3,485 points)

    The standard bit rate for audio embedded in video is 48kHz. You should be setting your H4n to record 48kHz. I don't know if that is the cause of your sync issues but it should be the first thing to fix.

  • 5. Re: Why won't the audio sycn at 25fps?
    rasu Level 1 Level 1 (0 points)

    Thanks Thomas, yeah, done that. Made no difference.

  • 6. Re: Why won't the audio sycn at 25fps?
    f8photography Level 1 Level 1 (0 points)

    me, too the audio level was irrelevant for this problem.  any audio settings gave same problem, it is a framerate issue rather than audio.

  • 7. Re: Why won't the audio sycn at 25fps?
    rasu Level 1 Level 1 (0 points)

    There does seem to be a very big hole here. The audio sync capability seems to be rather flawed. It only syncs at 24fps and when it does it converts the output to 720. I think I might give it a rest for awhile and let someone else work it out. I've had enough for now!

  • 8. Re: Why won't the audio sycn at 25fps?
    f8photography Level 1 Level 1 (0 points)

    not much can do, just need to wait til they get their finger out their *** and update it so it works with different framerates and full HD.  Should be fixed in about 10 years....lol.

  • 9. Re: Why won't the audio sycn at 25fps?
    Thomas Emmerich Level 4 Level 4 (3,485 points)

    Check this, select a 24fps clip and in the inspector click the info button at the top. What is the audio sample rate?

     

    Do the same for the 25fps clip.

     

    Then do the same for the audio only clip.

     

    Is the 5DmII video recording audio at 48kHz for both 24fps and 25fps? My DSLR only records 48kHz audio but it's an NTSC model so it won't do 25fps.

     

    I still think it's an audio problem. Audio is key here for syncing since FCP X uses the audio tracks to sync things up.

  • 10. Re: Why won't the audio sycn at 25fps?
    rasu Level 1 Level 1 (0 points)

    Yes it does record at 48khz both 25 and 24fps.

  • 11. Re: Why won't the audio sycn at 25fps?
    f8photography Level 1 Level 1 (0 points)

    I think you'll find its most likely not an audio problem, as when me and my colleagues do everything the same in 24fps or 25fps the sync only works perfectly with 24fps.  Notice in the inspector that everything is being converted to 24fps 720, thats the problem during sync that it converts the frame rate without conforming it thru a proper means, i.e. compressor, if u do that urself first, then it works fine.

     

    Heres hoping they fix it on the next release.

  • 12. Re: Why won't the audio sycn at 25fps?
    rasu Level 1 Level 1 (0 points)

    So, please correct me if I am wrong, directly through FCPX I can only sync audio to video at 24fps, 720p but if I go through compressor I can get the audio to sync at 25fps, 1080p? I haven't used compressor so I am unfamiliar with what it can do.

  • 13. Re: Why won't the audio sycn at 25fps?
    antonie2011 Level 1 Level 1 (0 points)

    Just make a compound clip of the video and the extra audio channel.

    Nudge the audio manual into sync with , and .

    Auto sync needs some more work from the FCP team before we can sit back and .

  • 14. Re: Why won't the audio sycn at 25fps?
    f8photography Level 1 Level 1 (0 points)

    yes, this works fine if u nudge manually....as u say, will have to wait for them to fix...nice of them to make us pay for software that is basically beta version....last night i tried to edit a simple 4 minute interview, the program crashed at least 10 times, freezes up, etc, etc, on a state of the art i7 with 16GB ram.....dont get me wrong, i love the interface and the idea of this software, buts its far from ready....

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