Cellphone with stable framerate video?

Is there any current cellphone which shoots video in a stable framerate?

filmic pro is the app for phones for getting constant frame rates

edit: WRONG INFO!

Unfortunately not.

On iOS not even Filmic Pro helps. The iPhone 13 with Filmic Pro still records with a variable framerate as reported by ProVideo Coalition. Even the ProRes is variable framerate! That's crazy.

Not sure if it's the same for Filmic Pro on all Android phones, but the normal one's are variable framerate.

If you happen to have a Mac, Compressor helps:
https://www.krishna.video/post/2020/03/ ... .html#fn:1

Is it not simply because the camera doesn’t have an aperture ?
(And therefore it’s one of the ways you vary exposure)
JB

Well, a GoPro has fixed aperture and is varying the shutter to adjust for light. Nevertheless it records CFR.
Many drones do the same. Why, oh why, are smartphones are still screwing our editing experience? Even an iPhone they try to sell as 'cinematic'.

Unfortunately not.

aha, but the few shots i made with filmic were always 25fps and never more or less

edit:
apparently i have confused this with the audio infos

Screenshot 2021-11-25 at 13.37.31.jpg (160.15 KiB) Viewed 3323 times

Okay, it looks like the (almost) unanimous verdict, the answer is:
"No", no current cellphone shoots video in a constant, stable framerate.

Unfortunately not.

aha, but the few shots i made with filmic were always 25fps and never more or less

edit:
apparently i have confused this with the audio infos

Screenshot 2021-11-25 at 13.37.31.jpg

Thanks, Mark.
The attached screenshot is for a very short shot, about 18 seconds, and it doesn't specify whether it's constant or variable framerate.
Thus, I fail to see definite answer here.

If you happen to have a Mac, Compressor helps:
https://www.krishna.video/post/2020/03/ ... .html#fn:1

Thanks, Uli.
As can be seen in my signature, I'm on a PC, no Mac here.

Few questions:
1. Is there any way to turn variable framerate video to a constant one on PC?

2. What happens to the audio sync, when audio is used along the video from a cellphone?

3. Can DaVinci Resolve handle clips with variable framerates coming from smartphones?

4. If yes, can they be edited together with other clips of constant framerates from video cameras?

best you transcode your phone footage in a editable format like DNxHR (or prores on mac)

free shutter encoder should this for you

https://www.shutterencoder.com/en/

Thanks, Mark.

In my experience, Premiere Pro seems to handle the vfr footage just fine, as long as it’s h.264. The hevc/h.265 won’t play back properly for me, so I use the free Handbrake to transcode it.

Darryl

@Joshua
1. got answered
2. it will be problematic, you may need to introduce manual, tedious corrections
3. not always, I've experienced both offline messages and sync issues
4. as long as they work, you can mix, DR supports mixed frame rates in a timeline

As you can see, smartphones are not a great option as sources for DR. If you can't use regular cameras, amateur NLEs may handle such sources better.

Thanks, Uli and all.

I have downloaded two ProRes videos shot with an iPhone 13 Pro, and their frame rate is Constant.

Attached is the download link and a Mediainfo image of one of the videos:

In a week or two I will receive the 256GB iPhone 13 Pro Max and I will be able to do the tests myself and write them to you here.

You can see this interesting report on the quality of ProRes in this device:

Hi Francisco,
Thank you.

The Mediainfo data you attached is impressive, however, it's only 37 seconds clip. I wonder if the framerate remains constant on long clips, of say, 10 minutes and longer.

As for the YouTube review you attached: I don't take all YouTube reviews I've seen so far seriously. One, out of few, reason is that no review I've seen so far even address the issue of constant vs. variable framerate.
Also, considering the tiny size of smartphones sensors, though clips may look great on a computer screen, I wonder how they may look on a cinema big screen, especially clips shot under low light conditions.

Hi Francisco (and all),
For how long can the iPhone 13 Pro Max shoot 4k video continuously?
How long a 4k video can the iPhone 13 Pro Max 256GB contain?

I am very afraid that in longer videos the frame rate is variable, because I have just verified it in one that I have recorded with my beloved iPhone 7 Plus.

I think I'm going to have to settle for this problem on my iPhone 13 Pro Max, which is on its way.

now that this has left me no peace and to my knowledge prores is a VBR codec,
I have also downloaded a file.

and here you can clearly see that is a variable bitrate file.
(which is also given by the prores codec)

so I wonder how francisco comes to the constant display in the attachment?

Screenshot 2021-11-27 at 18.25.23.jpg (157.41 KiB) Viewed 2689 times

from the apple prores white paper:

Screenshot 2021-11-27 at 18.18.55.jpg (233.92 KiB) Viewed 2689 times

These attachments above indicate a variable bit rate but a constant frame rate, 25 fps. That’s not conflicting information.

These attachments above indicate a variable bit rate but a constant frame rate, 25 fps. That’s not conflicting information.

but the other shows constant BIT rate! and this is not in the specs of prores
and the file shows VBR to me.

this is what i'm talking about

Sorry, Mark. Thanks.

Dear Mark, I have downloaded from a link on YouTube an example of a ProRes video of an iPhone 13 Pro, and when analyzed with the Mediainfo app it indicates that its Frame rate is constant.

However, Josué says that this happens because the video is short, and that in longer videos the Frame rate is variable.

I now have an iPhone 7 Plus and I have verified that, for example, in one of its MPEG4 videos of 20 seconds Mediainfo indicates that its Frame rate is constant and in another 3 minutes its Frame rate is variable.

I don't think this is a Mediinfo bug.

As I have ordered an iPhone 13 Pro Max, in a few days I will be able to do the test myself with your ProRes videos

Sony is coming out with the A3 camera which is a marriage between cell phone image technology and sony imaging hardware. It will be like the sony pro-1 phone but without the phone capability, in a mirrorless camera style body. The rumors are that it will be full-frame.

Sony A3

ANDROID
FF 12MP E-Mount
5 FPS
Flippy Screen
4K/60 Full – WIdth
Internal Memory
GPS / Cellular
$999


Ricardo Marty

Dear Mark, I have downloaded from a link on YouTube an example of a ProRes video of an iPhone 13 Pro, and when analyzed with the Mediainfo app it indicates that its Frame rate is constant.
.....

i also downloaded the file from your YT video and for me
mediainfo says right VBR for this prores file.