On Wed, Sep 19, 2012 at 1:26 AM, Janne Liljeblad
<[email protected]> wrote:
> Hi,
>
> I've so far read code Render::mltChangeClipSpeed() from Kdenlive and
> scr/modules/motion_est/factory.c,
> scr/modules/motion_est/producer_slowmotion.c from MLT. I also looked
> wiki http://mltframework.org/bin/view/MLT/ProducerSlowmotion.
That producer is not producing satisfactory results. It was trying to
do fast interpolation using motion estimation.
> All I came up with was that I should do:
>
> producer = mlt.Producer(profile, "slowmotion", path)
> producer.set("resource", str(path + "?0.25"))
>
> to create slowmotion clips, but this does not seem to work.
Kdenlive uses the "framebuffer" producer:
/**
* Speed must be appended to the filename with '?'. To play
your video at 50%:
melt framebuffer:my_video.mpg?0.5
* Stroboscope effect can be obtained by adding a stobe=x
parameter, where
x is the number of frames that will be ignored.
* You can play the movie backwards by adding reverse=1
* You can freeze the clip at a determined position by adding
freeze=frame_pos
add freeze_after=1 to freeze only paste position or
freeze_before to freeze before it
**/
> Could you show how this should be done? It also also seems that there
> are slowmotion filters, should those be used instead?
no
> I can usually decode this stuff from KDEnlive and Openshot, but now my
> grepping fails me.
>
>
> Janne
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