Jumping Footage

[zachflynn99]

I'm having an issue with some iphone footage in Premiere Pro, playback is very very jumpy and seems to have mixed all the frames up. Does anyone know how to fix this issue? 

[Ann Bens]

Might want to convert the footage to a format Premiere likes and can handle.

Use HandBrake and be sure to set it to constant framerate.

[zachflynn99]

Ok thanks for your reply. I've never had issues with this footage when editing on a Mac in Premiere, Now I've switched to a PC this has become an issue.

[Media Editor]

Why Constant Framerate and not Peak Framerate ?

[Michael Grenadier]

what format are the iphone clips?   The latest iphones use a different codec which can cause issues on computers running os's (at least on the mac).  And fwiw, the iphone footage that I've worked with does not have a precise consistent frame rate.  This can cause all sorts of issues...  recently was troubleshooting a friends project when I noticed that the timecode display would only display frames, not timecode.  the cause was the source clips erratic frame rate.  Ann, I haven't used Handbrake in years.  Any reason not to use something like Adobe Media Encoder...?

[zachflynn99]

The phone shots are from a mixture of Iphone 7 + XS Max. Frame rates are differing from 29.97, 30, 30.02. I have used media encoder and this has fixed the issue. Before putting it through media encoder I opened the same project file on my macbook pro and had no issue with playback. What would be the reason

[zachflynn99]

Does anybody why this wouldnt work on a PC but be fine on a Mac?

[Ann Bens]

AME does not correct the framerate  It uses the framerate it interpretes on import.

It will be constant but at an odd framerate; e.g. 25.03 instead of 25 (i am in pal-land)

[Michael Grenadier]

Compressor will do it, but not AME? but he's on a pc, so Compressor's not an option...

[Michael Grenadier]

I think you can have ame interpret the footage with a different frame rate. Select the clip in the AME encoder, NOT the preset and right click and choose "interpret footage." Haven't had a chance to test this but it sure looks like it works."

[Michael Grenadier]

running a test now, but sure looks like it works. If you "interpret" the footage as described in my last post, and then click match source in your encoder options, it shows up at 29.97 fps. Will post back after the test output's complete

[Michael Grenadier]

Yup, seems to have worked. the exported quicktime reports 29.97fps in both quicktime player and in premiere, and when I play the clip in premiere it looks ok, and when I step thru it I don't' see any evidence of weird blended frames...

[Michael Grenadier]

and you can apply the interpret footage workflow from within premiere. Right click on the clip in the bin and chose modify: interpret footage and choose "assume this frame rate" and enter 29.97 fps (or 25 fps if you're in PAL land)..

[Michael Grenadier]

that said, the one situation where you need to be careful is if you're shooting with multiple cameras that you want to synch up. I imagine the adjusted duration after interpreting the footage might make synching problematic.

[zachflynn99]

I will try this. Many thanks :0

[Ann Bens]

Please use the Blue reply button so posts dont get buried.

[Michael Grenadier]

the reply button at the top of the thread? Seems counterintuitive to me and if you're following the thread, you'll get a notification, I think. Let me know if I'm missing anything here. And I'm assuming that you agree that you can use AME to interpret the footage to a different frame rate.

[Ann Bens]

Answers dont get lost just buried in View all replies (big pita as most of them are empty...)

I tested AME in the past; did not work.

[Michael Grenadier]

ok, I'll use the blue reply button at the top...  But as I said, I just tested the interpret footage command in AME and it worked without issues.  I'll do a longer clip and see if there are any problems...

[Michael Grenadier]

yup, just did a 5 minute clip with interpret footage applied to the clip in AME.  It worked without issues.  I've attached 2 screen grabs, one showing the interpret settings in AME and the second showing the frame rate of the camera original

  

[Ann Bens]

Did you check the audio? Is it still in sync?

[Michael Grenadier]

you're right, the audio's screwed up.  

[Michael Grenadier]

heres some weirdness.  the interpolation worked when I downrezed to 1080 prores proxy in ame.  5 minute clip in synch through the end.  clearly ame not dependable on this...