Can I increase FPS by speeding up the video?

[Lazare Londaridze]

Hello, is it possible to increase frame rate of a video by speeding it up?
If yes which software do you recommend ? I need a loss less converter , please help...

[hello_hello]

Yes. You can open it with a program capable of remuxing and save it as a new file while specifying a new frame rate. It mightn't be that easy though, as it'll generally put the audio out of sync, so you need to re-encode the audio while speeding it up to match.

The crystal ball is on the blink at the moment, so without knowing the file type you have I'd suggest trying MKVToolNixGUI. It'll open lots of file types and remux the output as MKV.

[Lazare Londaridze]

Are there any other software I can use?

[Lazare Londaridze]

Yes. You can open it with a program capable of remuxing and save it as a new file while specifying a new frame rate. It mightn't be that easy though, as it'll generally put the audio out of sync, so you need to re-encode the audio while speeding it up to match.

The crystal ball is on the blink at the moment, so without knowing the file type you have I'd suggest trying MKVToolNixGUI. It'll open lots of file types and remux the output as MKV.

How would that even work? I'm working with an animation, true , it'll say more fps but nothing will change visually, to increase animations frame rate either new frames must be created or everything sped up

[theewizard]

what is wrong NOW ? why the change
is it a very low fps, that looks blocky ?
are you trying to smooth the characters movement
or are you trying to speed up the action
the first can be done by doubling the fps using interpolation to create new frames in between the current frames, and maybe adding a little bit of motion blur
runtime will be the same

the second is much harder, maybe impossible without creating a new sound track

i have Never tried what i'm suggesting, just remember reading about it in some thread

[hello_hello]

How would that even work? I'm working with an animation, true , it'll say more fps but nothing will change visually, to increase animations frame rate either new frames must be created or everything sped up

You asked how to increase the frame rate of a video by speeding it up. They're the same thing. If you increase the frame rate, the frames go by faster and the video runs quicker. To speed it up, you increase the frame rate. If I didn't supply the correct answer it might be because you didn't ask the right question. When you asked if you can increase the frame rate of a video by speeding it up, were you not referring to speeding up the video? Does "speeding it up" mean adding more frames but not speeding up the video?

Anyway.... there's no crystal ball required to tell you it's not possible to increase the number of frames losslessly with a "converter". Frames need to be duplicated, blended or interpolated and the video has to be re-encoded. And I suspect for animation it'll look even worse than it does for film or video. There's always some artefacts when interpolating frames, although maybe it's improved since I tried it, which was a fair while ago.

Frame interpolation
http://www.spirton.com/interframe/

You can try doing it on playback instead if you have a fast enough PC:
https://www.svp-team.com/w/index.php?title=Main_Page
The latest version has restrictions unless you pay for it but it looks like the old version 3.1 can still be downloaded from the bottom of this page. It's free.
https://www.svp-team.com/wiki/Download

Potplayer also has a similar function for increasing the frame rate. It does so using an Avisynth script but you need to have Avisynth installed, Interframe working, and probably a fairly fast CPU.

[theewizard]

Lazare
You say speed up
But you haven't answered the question what do mean by speed up
Faster movement on screen
Or
More frames to reduce jerkiness
What is the frame rate now what is the problem you are trying to fix?
Is this your own creation, or are you trying to change the look of some anime

[Lazare Londaridze]

Well I'll give you an example of what I'm talking about, let's say 100 frames are shown in 10 seconds, I want those 100 frames to be shown in 5 seconds, in this case FPS will double right?
How can I achieve this? I don't want to create new frames, sorry for my bad English

[Lazare Londaridze]

Lazare
You say speed up
But you haven't answered the question what do mean by speed up
Faster movement on screen
Or
More frames to reduce jerkiness
What is the frame rate now what is the problem you are trying to fix?
Is this your own creation, or are you trying to change the look of some anime

Yes' trying to change the look of an anime

[manono]

And you do know that by speeding up the video the audio goes out of synch, right?

As hello_hello asked in the first reply to your thread, what video format are you working with? If you don't know then supply the information MediaInfo gives about your video.

[Lazare Londaridze]

I don't care about the audio at all. I'm working with MKV and Mp4

[manono]

Then for MKV, as hello_hello also mentioned in the first reply, you can speed up the video using MKVToolNix (mmg.exe). Have you even tried yet?

Open and then highlight the video, click on 'format specific options' and set the FPS you like.

[Lazare Londaridze]

Where do I find format specific options ?

[hello_hello]

For the new GUI (MKVToolNixGUI rather than the old MKVMergeGUI) there's no "format specific options" tab. You need to highlight the video stream and look under the "timecodes and default duration" tab to change the frame rate. There's a field labelled "Default duration/FPS".

It gives you a few choices in a drop down list, or you can type in your own frame rate. If the frame rate you select doesn't give you the result you expect (which happens with interlaced video sometimes), try 30000/1001p or 60000/1001i 0r 60000/1001p until one of them gives you double the frame rate (assuming the video is 29.970fps to begin with and you want to double the speed).

It's possible a media player might still display the wrong frame rate, but in the example above, as long as the video duration is halved and it plays at twice the speed then I wouldn't worry too much about the frame rate being displayed. Progressive video is simple to work with when it comes to changing the frame rate but interlaced h264 can be a bit "odd" at times.

[manono]

For the new GUI (MKVToolNixGUI rather than the old MKVMergeGUI) there's no "format specific options" tab

Hehe, oh, you mean it's changed since my 2014 edition? Thanks for correcting me and sending Lazare Londaridze on his way.

[hello_hello]

manono,
If you're still using the old GUI I'd recommend switching unless you have a specific reason not to. For the moment it's working on XP again, if that's the issue. I was using version 7.8.0 until recently but switched to version 9.2.0 once I realised it runs on XP. There's a few things I would have done differently but in my opinion once you're used to it, the new GUI is a big improvement over the old one.