50fps to 25fps without loosing frames?

[Tero Ahlfors]

[Victor Clausson] “Is there a way to convert 50fps to 25fps without loosing these frames, prevent it from going in slow motion and keep the current length of the clip?”

Nope. Because the console seems to be drawing the player fire on sequential frames and when you take every other frame out the bullets won’t show. You could try capturing the video as interlaced and look how that behaves.

[Ivan Myles]

Yes, you can do this by layering two adjacent frames above each other in a 25fps sequence. Please refer to the image and sample video below.

1) Create two 50fps sequences of the clip (A and B).
2) In one of the 50fps sequences, trim the first frame and slide the clip to frame zero.
3) Create a 25fps sequence and nest the two 50fps sequences above each over.
4) Reduce the opacity of the upper sequence so that both clips appear. In this example the upper clip is set to 50% opacity.

50 to 25 FPS Layered

[Victor Clausson]

[Ivan Myles] “Yes, you can do this by layering two adjacent frames above each other in a 25fps sequence. Please refer to the image and sample video below.

Thank you so much Ivan! That worked perfectly! You saved my day and this video project. I can’t thank you enough!

[Ivan Myles]

You’re welcome. Good luck with the project.

[Alessio Cappelli]

Hi Ivan,

from what I have read so far, you seem to be a very knowledgeable person…

Could you help me with this issue by any chance? I’m nearly desperate..

I am experiencing problems working with 50fps footage in a 25fps progressive sequence (I don’t want slow-mo, just normal use): even after interpreting and rendering these files (in order to have a correct playback), the precise cuts and trims would still be influenced by the behavior of the original media files, i.e. a random re-linking to media files at the opening of a project would cancel the rendering, thus making all my work useless.

Re-rendering (after cutting and trimming) wouldn’t still change the situation…

Is it there a way to safely and comfortably working with these 50fps in a 25fps progressive sequence???? Thank you very much. I will appreciate if you could help me…

Alessio

[Ivan Myles]

I have experienced issues when changing the frame rate of compressed source files. Here are two approaches:

1) Instead of using the 50fps footage directly in the 25fps timeline, create a 50fps sequence for the source file. Insert the 50fps sequence into the main 25fps timeline and adjust Speed/Duration of the inserted sequence accordingly. Or,

2) Transcode the source file into an all intra-frame intermediate format such as ProRes, DNxHD, AVC-I, DPX, or uncompressed YUV. Be sure to check/adjust the luminance and RGB levels before transcoding. If you don’t need the source footage at its native frame rate, transcoding at 25fps will save file space.

[Benny Godfrey]

Hi Ivan,

You sound like the guy I need to chat with..Very knowledgeable!

I have shot a 45 minute documentary on the GH4.

I shot it in 4k 25fps and 1080 50fps.

I have been editing on a 1080 25fps timeline downscale the 4K footage to 1080. The doco is half 25 and half 50fps and I have used a fair bit of the 1080/50 footage as slow motion (speed Duration 50%).

My question I have a bunch of 1080/50 footage I want to keep at normal speed in the film. When I export a 1080/25 .mp4 or .mov of the film it plays fine on vimeo and USB in TV. How come I am not dropping frames on export and getting jerky footage?

I am worried because the film has been chosen for a film festival, which it will get play in cinemas etc Will the footage come out jerky/dropped frames on the projection/cinema screen?

Would I have to interrupt the footage to 25fps then speed it up by 200%? Would that work to keep it all 25pfs?

Thanks in advance
Benny

[Tero Ahlfors]

If you edit 50fps footage to a 25fps timeline Premiere is automatically removing every other frame. This will keep the original footage running at the same speed. If you interpret the 50fps footage to run at 25fps and edit that in then the footage will be in slow motion.

[Benny Godfrey]

Thanks for the reply Tero.

So there wont be any playback issues when using 50fps footage at normal speed when exporting at 25fps? Obliviously frames will be removed but I just wanted to make sure there wont be any issues.

I really like shooting 50fps on my doco/run&gun promos as it gives me the option to slow it down if I’d like. Some of the times your not sure if its going to be used slowmo or normal speed all depends on the production.

Any advice is much appreciated.

Cheers
Benny

[Mohammad Maleki]

hello
thanks for this solution but if you can do this on video and show me
i can’t understand 2) In one of the 50fps sequences, trim the first frame and slide the clip to frame zero.

thanks.