25 to 24 fps audio question

[neilwilkes]

I know I can timestretch in Nuendo to get the right results, but do not want to use the timestretching algorithm.
Reason is the source is decoded AC3 (no other available), and stretching decoded AC3 and then going to DTS is causing artifacts.

Source is 25fps, needs to go to 24fps.
Difficulty for me is that the video boys captured the 25fps to 24fps in a frame to frame method, resulting in longer running time.
Tried timestretch, it works well (104.16666666%) but artifacting.
Also tried resampling, but that gave me the right sync with the wrong pitch.

Can I do this any other way using Nuendo, or am I stuck with the timestretch?

[tom_lowe]

Originally Posted by neilwilkes

I know I can timestretch in Nuendo to get the right results, but do not want to use the timestretching algorithm.
Reason is the source is decoded AC3 (no other available), and stretching decoded AC3 and then going to DTS is causing artifacts.

Source is 25fps, needs to go to 24fps.
Difficulty for me is that the video boys captured the 25fps to 24fps in a frame to frame method, resulting in longer running time.
Tried timestretch, it works well (104.16666666%) but artifacting.
Also tried resampling, but that gave me the right sync with the wrong pitch.

Can I do this any other way using Nuendo, or am I stuck with the timestretch?

Best bet is to do it by the resampling method to get the correct time, then correct the pitch after using something like Pitch n Time pro.

[neilwilkes]

Originally Posted by tom_lowe

Best bet is to do it by the resampling method to get the correct time, then correct the pitch after using something like Pitch n Time pro.

Thanks for the info.
This is the way we went in the end - except the pitching was left as it was.
(Don't have the "Pitch n Time plugin, and the MPEX stuff leaves too many artifacts)

[tom_lowe]

Originally Posted by neilwilkes

Thanks for the info.
This is the way we went in the end - except the pitching was left as it was.
(Don't have the "Pitch n Time plugin, and the MPEX stuff leaves too many artifacts)

If you ever want stuff done in the future, let me know and I'd be happy to help.

[neilwilkes]

Hi Tom.

Got a real doozie here right now.
One episode needs a remix from the DTRS streams.
The footage was shot at 25fps, and the footage I have to mix to is converted to 24fps, resulting in a longer runout time.
However, the supplied streams are actually longer than the 24p footage is - how is this possible, and what do I need to do to get things back in sync?

[tom_lowe]

Originally Posted by neilwilkes

Hi Tom.

Got a real doozie here right now.
One episode needs a remix from the DTRS streams.
The footage was shot at 25fps, and the footage I have to mix to is converted to 24fps, resulting in a longer runout time.
However, the supplied streams are actually longer than the 24p footage is - how is this possible, and what do I need to do to get things back in sync?

Was the audio on the DTRS originally 25fps? How much longer is it? It may be a case that instead of doing the 4% slow down, they have dropped certain fields when converting to 24fps to keep the correct timing.

That's all I can think of for now. Do you have an e-mail I can contact you on?

[neilwilkes]

Originally Posted by tom_lowe

Was the audio on the DTRS originally 25fps? How much longer is it? It may be a case that instead of doing the 4% slow down, they have dropped certain fields when converting to 24fps to keep the correct timing.

That's all I can think of for now. Do you have an e-mail I can contact you on?

Hey Tom.
3 different running times here.
1 - Original DVD = 50:00:17 (in 24p project)
2 - new 24p transfer = 52:08
3 - So-called DTRS transfer = 53:29:21
All values given in 24p project.
Resampling the DVD audio by +4.16666666 works, syncs up to the new transfer & gives me pitch the same. So no worries there.
(yes, I know pitch is wrong compared to original but there are very good reasons for doing this - long, boring story)

No values I have tried get me the original "DTRS" streams to match anything in the project though.