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lehestro
lehestro
Inspiring
February 6, 2021
Answered

Proxy playback of iPhone footage even worse than OG media

  • February 6, 2021
  • 1 reply
  • 3083 views

Shot a thing over the weekend on a c300 mkII and my iphone 12 pro using filmic pro's extreme setting in LOG, both in 4K. I made proxies for the c300 footage - 1080p ProRes Proxy settings.

 

Playback of the iphone files was good, but shuttling through was pretty choppy so I decided to make proxies of the iphone footage. Same settings. Now shuttling and playback are horrible - about 1 frame a second.

This is a particular situation. I've used ProRes proxies for all kinds of things, and never had this problem. I saw a couple of things on this, but no real solution. Some people had better luck with cineform proxies. 

 

Everything is running off of an SSD with plenty of bandwith. I'm on macOS 10.13 with plenty of RAM and all that. Premiere Pro 14.6 build 51.

Correct answer lehestro

I was using the lowest quality ProRes preset, creating the the proxies in Premiere.

 

But I figured out the issue. It's the original iphone footage itself. Nowhere did I know this before digging, but most phones shoot at a variable frame rate. This is really confusing for Premiere. Even though I was using Filmic Pro and specifing 24fps, it still is only able to approximate that (it's a very close approximation, but enough to through Premiere for a loop). 

 

Going to Modify>Interpret Footage and forcing the footage to adhere to 24fps has eliminated the problem and now the proxies work marvelously. I had my proxy settings to keep whatever the source FPS is. Going forward, specifically for smartphone footage, I'm making a new proxy preset that strictly conforms the footage to 24fps (or 30 or 60 or whatever the target is).

1 reply

J
Community Expert
John V KnowlesCommunity Expert
Community Expert
February 7, 2021

Are you creating Proxies from within Premiere (as opposed to externally and then attahcing)? If so then use the lowest quality ProRes preset and see how that goes. 

 

HTH,

JVK

-------------------------------------------------------------------------JVK | Editor/Designer/Software Instructor. Pr, Ae, Ch, Ps, Ai, Id
    lehestro
    lehestroAuthorCorrect answer
    Inspiring
    February 7, 2021

    I was using the lowest quality ProRes preset, creating the the proxies in Premiere.

     

    But I figured out the issue. It's the original iphone footage itself. Nowhere did I know this before digging, but most phones shoot at a variable frame rate. This is really confusing for Premiere. Even though I was using Filmic Pro and specifing 24fps, it still is only able to approximate that (it's a very close approximation, but enough to through Premiere for a loop). 

     

    Going to Modify>Interpret Footage and forcing the footage to adhere to 24fps has eliminated the problem and now the proxies work marvelously. I had my proxy settings to keep whatever the source FPS is. Going forward, specifically for smartphone footage, I'm making a new proxy preset that strictly conforms the footage to 24fps (or 30 or 60 or whatever the target is).

      M
      Michael Grenadier
      Legend
      February 8, 2021

      2 things.  conforming the footage to a constant frame rate can apparently cause synch issues with the audio.  Handbrake will convert to a constant frame rate without causing any synch issues.  The other is that I've been told by a dp I work with that filmic pro has an option to record with a constant frame rate.  worth doing some research on that.

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