[Kdenlive-devel] speed effect

Dan Dennedy dan at dennedy.org
Thu Nov 26 12:11:14 UTC 2009

On Wed, Nov 25, 2009 at 2:27 PM, Mikko Rapeli <mikko.rapeli at iki.fi> wrote:
> Hello again,
> I have a problem with speed effect once again.
> My project is 720p30 in kdenlive and my material is 720p60. If I use
> speed effect to play at 50% I get 720p15 instead of expected 720p30.
> It appears kdenlive first renders input clips to project setting p30 and
> then applies speed effect to get p15. Bugger.

I can confirm this is a limitation at the moment.

> Could the speed effect be applied to the original file with original fps
> and convert to project p30 after playing faster/slower?

Sorry, not in the near term. Currently, non-speed-effect frame rate
handling is done within the ffmpeg plugin. I would have to remove that
and rely entirely upon something like the speed effect, which as you
know does not support audio at the moment. So, this is not some simple
bug fix, but a major rework.

> I guess only speed effect allows me to play p60 clips slower at p30.
> Editing clip properties seems not to be possible in the GUI.
> Sample p60 clip is here:
> http://mcfrisk.kapsi.fi/linux/video/gopro_hd_hero/GOPR0007_720p60.MP4
> -Mikko


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