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Frame Rate – Misread By Premier CS6 ?
I am working in Premeire CS6
I did a two camera shoot using 7D and T3i. When I import the T3i footage it comes in at 29.97 fps but when my DP loaded the exact same T3i footage on his system, Premier CS5, it comes up at 23.976.The 7D footage comes up at 23.976 and I am trying to get the T3i footage to come in 23.976 as well. In addition to being in 29.97 frame rate, the T3i footage runs faster than the 7D footage – it starts in sync but runs faster than the 7d footage and quickly falls out of sync and ends much sooner. I know that the lenght/speed of the clip should not change at all (run faster or slower) with a change in the frame rate, because changing the frame rate does not change the lenght/speed of the clip (It just adds or reduces the number of frames in a given clip). So I have no idea as why the T3i footage is running fast.
I followed the very helpful Rich Harrington tutorial about converting frame rates in After Effects and did a conversion (taking the T3i footage from 29.97 to 23.976). The T3i converted footage shows up in Premier as 23.976, but still runs fast.
Something really screwy is going on. Since the T3i footage comes in at 23.976 on my DPs system, I am inclined to think that there is some setting and/or bug in my system that is causing the T3i footage to be misread in my system. I am particularly inclined to think this because, even after I do a conversiion in After Effects, the frame rate changes (from 29.97 to 23.976)but the T3i footage is still the same “fast” footage that starts in sync but quickly runs out of sync and finishes too soon.
If I reduce the speed of the T3i footage to 80%, it basically will run in sync with the 7D footage and that could be the quick solution – although it feels like a backwards way of doing things.
Does anyone have any idea what is going on?
Jim Leo
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7 Replies
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What does Quicktime Players video info say about the files? If you’re on Windows you could try G-Spot to check the files out.
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Hmmmmmmmmmmmm. Interesting idea to check quicktime.
Quicktime is showing the T3i footage as 29.97 fps. I am not sure how that solves my issue, but I guess its another clue in the mystery.
Jim Leo
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Right-click the offending clip in Premiere’s project panel. Choose Modify > Interpret footage.
Click “Assume this frame rate” and enter 23.976.
This doesn’t solve the problem of why the clip is reporting the wrong frame rate to QuickTime, but it will let you work around it by forcing the clip to the correct speed.
Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog – What I’m thinking when my workstation’s thinking
Creative Cow Forum Host: Live & Stage Events -
Okay I followed your instructions and it worked – I think – – the footage runs longer and syncs up.
But now my mind is sort of blown- – here’s why:
There must be some sort of trade off using this technique as opposed to using the much longer technique of re setting the frame rate in after effects (in fact, even when I reset the fram rate in after effects, it still would not sync up). This method (hitting modify and reinterpret at 23.976) is sooooo much easier, but am I losing something in the trade off. As far as I can tell the footage looks good – but I am looking at it on a small monitor. If this is all that is required, then why would anyone recommend the long process of resetting the footage in after effects.
Sorry if this is a bit rambling. Thanks much for your help.
Jim
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[jim leo] “There must be some sort of trade off using this technique as opposed to using the much longer technique of re setting the frame rate in after effects (in fact, even when I reset the fram rate in after effects, it still would not sync up). This method (hitting modify and reinterpret at 23.976) is sooooo much easier, but am I losing something in the trade off.”
First, I’m not sure what technique you were using in Ae to “reset the frame rate.” If you can tell me step-by-step what you did there, I’ll tell you why it didn’t sync up.
Secondly, there is no trade-off. You’re simply telling Premiere to override the frame rate indicated by the file. It does not do any frame blending, interpolation, or visual processing of any kind; it simply uses the existing frames in the video, as they are, at the frame rate you tell it to instead of at the frame rate the video file tells it to.
[jim leo] “As far as I can tell the footage looks good – but I am looking at it on a small monitor. If this is all that is required, then why would anyone recommend the long process of resetting the footage in after effects.”
Because they didn’t know you could re-interpret footage in Premiere? You just got some bad advice the first go-around.
I hope this has been more helpful.
Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog – What I’m thinking when my workstation’s thinking
Creative Cow Forum Host: Live & Stage Events -
Here is the AE steps
I import the footage with teh 29 fps in it to Ae
I create a composition in Ae with the footage
I go to composition settings and change the frame rate to 24 fps
I click on frame blending
double click the switch to advance frame blending
and renderWalter, thanks for the help. Maybe I shouldn’t be looking to hard at solving the mystery and I should just be happy that there is a simple solution. And I should leave it at that.
Thanks again.
Jim
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So here’s an interesting question.
How did the DP and you split up the files? Did you each take home Hardrives from the shoot?
If that’s the case, then something seems to have gone wrong with the file copy. I’ve had similar things happen for un explained reasons where a whole batch of files won’t copy correctly… in that case they wouldn’t play in VLC and Premiere crashed when they were imported.
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