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duplicated frames after render
Here is what I did (with AE CS3 installed on a Power Mac G5 and an Intel Macbook Pro, both showed same results):
I rendered a composition 90 sec, NTSC framerate 29.97 (use comp’s frame rate in render settings, interlaced, lower field first)
I imported the mov file into the AVID. The playback looked somewhat jumpy and I started checking it out by going through the timeline frame by frame – and unbelievable: every 3 sec 20 frames there is a duplicated frame rendered!
The render took 16 hrs and I had to deliver, so, the short cut for me was to cut out the duplicated frames – 25 cuts in a 90 sec piece – fair enough.
Then I had changes and rendered again, only a 20 sec part of the same AE comp.
This time a duplicated frame showed up every 1 sec 13 frames – worse than before!
Other partial renders from the same AE comp didn’t have any problems.
Also: I watched the render and noticed in the details, it gives stats like: “last frame: 45 sec”, then suddenly it says “last frame: 1 sec”, difference minus 44 sec, and then 45 sec again…
I researched the internet but couldn’t find anything.
Any thoughts are really appreciated!
Sylke Froechtenigt, video editor
Kavanagh Productions Inc.
New York -
5 Replies
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if you bring the original render back into ae, do you see the same duplicate frame problem? (i’m hoping to rule out a problem with importing into avid.)
also, what codec are you rendering to in ae? (ie, quicktime lossless animation, hdv, etc…)
and are you using footage in the render or is it completely created from motion graphics? (i’m trying to rule out footage mis-interprettation within ae).
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW -
Thanks a lot – Dave and Kevin!
I did the test to bring the original render back in AE – and – wow – there are no duplicated frames in AE ! Then there must be something happening when importing into the Avid!
I imported the same clip again in the Avid – the one that had a duplicated frame every 1 sec 13 frames before – and the duplicated frame shifted for about 1 frame, the temporal pattern of 1:13 stayed the same.
My import settings are 601/709, non- square/ RGB/ Field order: Even (lower field first)
I created the comp with NTSC/D1 and I rendered with Animation Codec – best Quality (Quicktime)
I used one HD stock clip with the codec “Apple Photo Jpeg” (29.97 framerate) but only 6 sec. I don’t know enough about this codec, whether each frame is an index frame or not. What you, Dave, write about mpegs makes sense to me, and I will be aware to convert footage before using in AE in the future.
But here it seems to be an Avid Import issue. Does anybody know what I could do different?
(I will also try to bring the footage into FCP and see if this makes any difference)
Thanks,
Sylke
Sylke Froechtenigt, video editor
Kavanagh Productions Inc.
New York -
double check the frame rate of the render either in ae or quicktime (choose show movie inspector) to verify that it is 29.97.
also verify that your avid project setting are indeed 29.97– i’m not sure what they are called in avid, but it’s bound to have a project setting for the timeline that would have a frame rate associated with it.
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW -
Dave and Kevin,
I appreciate your thoughts on this.
The 709 standard refers to importing HD footage – and doesn’t really matter when importing SD into the Avid.
Interestingly, when creating a new project in the Avid (MC Adrenaline, which I just upgraded from v1.6 to v2.8), it gives me three different NTSC options: 23.976p , 24p and 30i. I never really thought about it, I lived always (since years:( in the assumption that NTSC is 29.97i and so are my Avid projects, but maybe that’s not the case…
I probably now should go back in AE, and first try to re-create the error, then change the frame rate of everything to 30, and then render and import again.
Only 2 of my partial renders of the same composition have been affected by this – different from each other: one is 1:13 and one is 3:20 in between the duplicated frame – all other partial renders are fine.
It’s difficult to nail things down, when the problems are intermittent…
I’ll call Avid about it, maybe setting up everything to 30i in AE would prevent this from happening in the future.
Thanks,
Sylke
Sylke Froechtenigt, video editor
Kavanagh Productions Inc.
New York -
Dave,
I don’t think that the stock clip, I used, has been shot with a DSLR camera and if so, it has been converted into 29.97 before I touched it, at least this is what the AE info says about this clip as well as the QT Movie Inspector.
I downloaded this clip from the stock footage library Pond5, which works similiar like istock (a crowd sourcing type of library) and the codec they require when someone uploads HD footage to their site is Photo Jepg – that’s why this clip is not in any other (maybe more common) codec like Apple ProRes etc.
My problem seems to be an incompatibility between my AE render and the Avid. I don’t see those duplicated frames viewing the render in QT or AE itself, so I have to ask Avid about it.
Thank you,
Sylke
Sylke Froechtenigt, video editor
Kavanagh Productions Inc.
New York
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