Known Participant

Question

Correcting mixed cadence

Forum|Forum|5 years ago
August 24, 2020
4 replies
3284 views

I have my film at the aggregators , it keeps getting rejected because of mixed cadence 4:1 & 1:1. I'm not sure where the problem occurred. Any suggestions on how to repair the problem?

This topic has been closed for replies.

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thomasmatthews

Participant

ha are you working with Good Deed? I just got the same thing from their QC.

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Iyekoretin

Participating Frequently

No. I am working with Bitmax. I still haven't been able ro fix mine because I had to replace my video card. I just got it back. My day job is wicked busy, so hopefully this week coming, I will work on it.

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thomasmatthews

Participant

Oh yeah bitmax is my distributors qc group. This is the first time I've heard of cadence outside of voice work

David BynumAuthor

Known Participant

The problem was the film was shot in two different fps rate. When editing make sure you set the frame rate to 29.97fps and edit the whole project in that rate. Unfortunately the only way to correct it is to rebuild the project on the proper timeline and fps rate. I tried every shortcut nothing worked. You have to redo on the proper timeline.

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Iyekoretin

Participating Frequently

So, I start a new timeline with a setting of 29.97 fps and I think premiere ask me if I want to "keep current setting?

Sent from my T-Mobile 5G Device

David BynumAuthor

Known Participant

Yes the whole project must be done on a 29.97 timeline. When you start the new project make sure it's set on 29.97 and stays that way until you export. If your already with a aggregator I'm assuming they want it Pro Res 422 export. If not export it how ever they request it.

Mike Dziennik

Community Expert

As your footage is 23.98p and your delivery is 29.97i then you need to apply 3:2 pulldown. This has to be applied at the last stage so the cadence is consistent through the programme (if done correctly you can reverse the process, but only because it is consistent throughout).

As mgrenadier suggested, you are probably best making a 23.98p timeline and using this as a master. You can then export at 29.97i and the cadence will be applied consistently. 3:2 pulldown is simply a matter of repeating fields so the quality should be the same regardless of which application is doing it (assuming it is a standard 3:2 pulldown: which Premiere will do...as opposed to some form of motion interpreted frame rate conversion...where different applications will have differing levels of quality.)

Again, as mgrenadier suggests, you can copy and paste your timeline, or you can simply change your existing sequence settings. Copy paste might be better because you can refer back to the original if anything goes wrong.

David BynumAuthor

Known Participant

I heard back from the aggregators today. That was the correct fix for the mixed cadence issue. We copied the files & placed them on a 23.967 timeline and it adjust the frame sizes and we went through and checked all edits and one last inspection of everything else.
we exported it in pro res 422 hq 29.97i. Stereo. And that corrected our issues. I can't thank you all for the knowledge and the fix to my problem. I'll come back and post when the film is released.

David BynumAuthor

Known Participant

Double check all your footage is 23.976fps and there's no blank spots in the timeline.

Additionally any imported graphics may be wrong framerate. You may want to ask them if they want 2:3 pulldown or 2:3:3:2 pulldown(one mixed frame in every 5 output frames, compared to 2:3 that produces 2 mixed frames, in every 5 output frames). AE can do custom pulldown types. If anyone has an alchemist, they can run it through to repair anything automatically. Also, setting upper field or lower field dominance in the render and sequence is important as well.

Here is the exact problem explained in the email.

***Updates for you this morning, the cadence issues are confirmed fixed however dropped frames have taken their place.

These instances are from the trailer, I’m still waiting for the full report from the feature:

01) -cadence fixed; dropped frames now present - 00:00:34 - 00:00:39 - missing frame of car present in previous fail not present

02) -cadence fixed; dropped frames now present - 00:01:13 - 00:01:20 - 4:1 cadence present in previous fail; missing frame not present

I think this might be something that the editing software introduces so I have hope it can be easily remedied.****

It was shot 23:976 & edited on 23:976 timeline to fix the cadence problem. Now dropped frames, I’m sure it’s export settings of frame rates. Any suggestions?

Does rendering upper field First, lower field first or progressive make a difference In missing frames?

Sent from my iPhone

[Moderator note: extraneous material removed. Please post forum issues only.]

Mike Dziennik

Community Expert

What frame rate are your sources and what is your delivery frame rate? Are your sources interlaced/progressive and does it match your delivery specs? Im not exactly sure what you/they mean by 4:1 & 1:1. Need more info.

David BynumAuthor

Known Participant

Ok sorry for the delay, I had to hear back from the aggregators. I'm still having the same problem. The film was shot at 23.976 progressive, it was edited in premiere pro. Exported in Pro Res 422, 29.97fps upper field first.

Here is the email stating the problem;

The Delivery specs are:

Apple Pro Res 422

29.97i

5.1 audio

any help or suggestions are more than welcomed , I'm about at my wits end here.

M

Michael Grenadier

Legend

I think (but I'm pretty sure I'm correct - bwdik) that you should have edited in a sequence with the same timebase as your sources... so that your sequence settings should have been 23.976 progressive (also known as 24p). Then when you exported it to 29.97 the pulldown would have been added consistently. With your current workflow, each time you drop a 24p clip into a 29.97 timeline, it's arbitrarily adding a different cadence. Not sure if the export process is the ideal way to add pulldown for the best quality... youo might want to do some googling.

If you have AfterEffects, you can test your output file to see if it can remove pulldown. You do this with the "interpret footage dialog." You may also be able to do this in Premiere, but I seem to remember having some issues with that.

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