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24fps project and 25fps output.
Hi, I know that this would be a common question and a search bought up so many scenarios but none that fitted me exactly so please forgive the re-asking.
So I have a timeline in a 24 fps project. I have 2 outputs to make. One at 24(easy,) and one at 25.
Im thinking that the best way for me to do this is export it at 24, make a 25fps project, import the 24fps file and let Avid do its own thing?
I have an Audio guy making Stems and he is asking if I plan to slow the whole thing down or add a frame every 1 second.
What do you all recommend?
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3 Replies
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My recommendation would be to speed it up. This is what we often do for feature films shot at 24 when they are being delivered for tv in the UK. Duplicating a frame every second in order to keep the same duration can be very noticeable, especially during smooth camera movements. So yes bring your export into a 25fps project and then use source settings to interpret it, matching the project frame rate. Give a new 25fps file to your sound person for reference, they should have to speed their stems up to around 104% to match. I can’t remember the exact number.
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Another vote for speeding it up. In fact, I don’t know of any way to properly do 24-25 (or vice-versa) without speed change, that would be good enough to get you through QC. Although it depends a bit on the content; some 2D animated shows may not even be created at a full 24 or 25, so then doing a Both Fields slowdown or speedup wouldn’t show as clearly.
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A lot of distributors will no longer accept these conversions if they are not done 1:1 – frame for frame conversions.
I bring in a 23.976 master to a 25 fps project. It is important that you don’t just open the sequence and have avid convert that, as the edit points can be affected by the timing of the new timeline, so it is better to bring in a single master of your program. Once the shot is in your timeline, you have to adjust it’s playback to be 100 percent, so the video and audio will now be out of sync.
From there, i export a wav file containing all the audio tracks. (direct output, single file)
I then import that into Reaper, and have it speed up the audio track to 1.042709376042709 in the item properties panel.
25 /23.976 gets you this number.
Enter however many of these digits Reaper will allow you to enter.
Tell reaper you want it to preserve the pitch, and set it to best quality, and do a consolidate/export.
The new audio will playback faster, but without the chipmunk effect.
I used to just bring the original audio files into Reaper and change them individually, but i had a couple of instances where they didn’t maintain perfect sync with each other. Doing them all in 1 file solves those issues.
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