Cannot activate "fractional fps" option

F

Fabrizio Lorito

New Member
Hi
I want to make a timelapse screen recording and to this purpose I'd like to use the video setting "Fractional fps value
However, this option is present but not selectable
Can abybody help me?
Thanks
/Fabrizio
 
First time I see this but I can't understand why you would do a timelapse with fractional recording. That option should only be used for old TV services if I rember correctly and even if I'm wrong about it, I'm sure you don't need it. I suggest using integer value and then speed up the clips in a video editor (like Premiere Pro for example).

This doesn't answer to your question, but I can't figure out the problem without a log file!

Please post a log with your issue! Here's how...

OBS Studio creates a log file each time you run it which contains very useful diagnostic information. Without a log file, it's much harder for any support volunteers to figure out problems and your post may be ignored. To upload a log file, go to the Help menu > Log Files > Upload Last Log...
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EDIT: Just for curiosity, are you italian too?
 
@Fabrizio Lorito Many settings are locked as long as you have an active output such as a recording, a stream, the virtual webcam or some plugin as the NDI plugin. Stop that output and the setting becomes editable.

@ModernManuh_ Timelapse mean speed up the recording, so you want to record only very few frames per second. For example you might want to record only 1 frame in 2 seconds (0.5 fps), so you configure a fractional fps of 1/2.
 
@koala Thanks. There was probably an active output. Now the fractional fps is available.

Is there any way to timelapse sampleing 1 frame each n with fractional fps but create the output file at say 24fps?
I can solve this in a video editor but this would ghelp me skip one processing step...
 
You cannot create the timelapse with OBS directly. You need a postprocessing step to actually speed up the video. If you record with 1/2 = 0.5 fps, OBS actually writes only 1 frame every 2 seconds, resulting in very compact files. However, the fps is recorded with the video file, so the media player knows that it should show every frame for 2 seconds, so the display time of the video is exactly the recording time.

If you want to speed this up to 24 fps, you need to apply a postprocessing step that speeds the video up by a factor of 48, so 0.5 fps becomes 24 fps. You can use ffmpeg for this, see this post of mine and the follwing post:

OBS Timelapse recording?

I want to record an hour of video with OBS. Afterwards I want to compress that hour into 10 seconds via for example Adobe Premiere. However, the whole process takes too much time and Premiere can only compress it to lets say around 1 minute, and it takes a long time to compress it, and the...
obsproject.com
 
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