Music Video – Audio Drift (Importing Drop or Non Drop?)

[Jason Honeycutt]

Okay, so I imported it by default, exported it as .wav file, then when I reimported it I got my options. So this should fix it… it’s a workaround but it worked 😉

(So… importing from MP3 or CDA gave me no options, WAV did.)

[Paul Carlin]

Drop and Non-Drop run at the same speed… it’s just a numbering scheme.

[Paul Carlin]

Find the CD player and disc you used on set and connect it to your Avid. Done.

[Jason Honeycutt]

It’s the darnest thing… we used the CD from their album, I imported the same track… and everything still drifts.

The project is obviously set up in 720p/23.976 and we shot it 720/24PN. I’m wondering if there’s an issue with the pulldown? The audio is running a little long, the video is coming in a little short.

I’m totally lost. Worse comes to worse, I can just slip every shot to be in sync for a bit but that’s such a monster pain.

[Bouke Vahl]

I totally agree.
You have to upsample from 44.1 to 48 anyways, so you might as well do that by going analogue in your Avid.
(If someone claims he can hear the difference tell him you frooze the disc for 48 hours before doing so, and colored the disc edge to prevent laser loss…)

If it would be a 23.976 / 24 thing (whatever it may have caused it)
over the duration of a song, say 3 min, you would be
(3 * 60) – (3 * 60 / 24 * 23.976) = 0.18 seconds off at the end.
That is 1 fifth of a second, roughly 6 frames in NTSC TC.
Is this what you’re seeing?

Bouke

https://www.videotoolshed.com/
smart tools for video pro’s

[Jason Honeycutt]

Yeah, that’s exactly what I’m seeing… off just a couple frames but obviously enough to be out of sync. What I did was stack all of the performances, ‘add edit’ then slipped them in sync, rolling out the video to cover the little gaps. I did that about nine times and it seems to be okay… but such a pain. I wish I could have just grouped them and edited.

Fortunately I have enough coverage to cover these ‘cut’ areas. I have to figure this out though for future projects, it might be some camera setting that I have to match with Avid so this doesn’t happen.

[Jon Zanone]

Change your audio sample rate (settings>audio project) to 44.1 to match the CD. Then import as normal. It’s not the video, it’s the audio. I had the same problem – I edited a music video with an unmastered CD cut at 44.1, then got the master CD (sampled at 48k) and experienced the same thing. Changing the sample rate in the Avid (it defaults to 48k) everything was golden…

Jon

“So you want to throw out the old you – but the old you is old enough to know it won’t make it better”
Del Amitri – “Make it Better”

[Michael Phillips]

Depending on which direction you need to go in, you can resetamp the sample rate in your WAV file and set the setting in audio import to change speed as well as sample rate when importing.

See: https://www.24p.com/AvidInsider2.htm

Michael

Michael Phillips

[Paul Carlin]

As good as Bouke is with numbers, the fact is that Panasonic’s P2 cameras record at 23.976 (AKA 23.98), which is confusing given the fact that they chose to name it 24p. Especially since 24p is a legitimate frame rate used since the dawn of film.

There is no issue with pulldown since there is none. You shot 24pN.

I agree with the fact that it is your audio that is giving you the problem. If you modify the video to match bad audio you are only going to make to problem worse down the road.

Restamping the audio will not help since this is not a 24p/23.876p issue.

I would take Jon’s suggestion first, followed by the freezing and marking the edge of the CD trick! :). After that, try freezing the Avid for 48 hours and cover it in black plastic to avoid light leak. Also, try covering your head with foil. It works for me.