[Kdenlive-devel] Questions and suggestions regarding Slideshow clips

[jb]

Harry van der Wolf wrote:
> Hi,
>
> I have some questions and suggestions about the "Create Slideshow clip".
>
> 1. Pop-up texts:
> a. The image duration says : Frames per image. It might be better to
> change this to Durations (seconds). Based on project settings (NTSC,
> PAL, or 15fps for web?) this will then automatically be translated in
> needed frames for the specified duration.
> b. The same is valid for Transition duration.
Agreed, in progress

>
> 2. Quality of transitions:
> When I select a Crossfade transition without LUMA file, the rendered
> slideshow in the end looks good. However, the slideshow effect is
> sometimes not visible at all. It looks as if it is skipped.
> Also, When I select a nice LUMA transition (clock, the new swirl, or
> another),
> - the transition effect is sometimes not visible at all
> - sometimes it looks like a "stutter" going from one slide to another,
> but the effect itself is not visible
> - and sometimes the effect is not finished, showing artifacts from the
> previous slide in the current slide (after the transition is finished,
> that is).
>

Does it also happen when you render the movie or only on preview ?

> My questions here are:
> a. how is the slideshow implemented? Is it a (external) call tot
> DVD-Slideshow (or dir2slideshow) from the DVD-slideshow tools, and if
> so: what version is needed? My Kubuntu comes shipped with the 0.72
> package. Is anyone using a newer version (the new 0.80) and does
> he/she do not have this caveats in quality (assuming it is based on
> dvd-slideshow)?
> b. If it is not dvd-slideshow, is there some quality setting for
> slideshows within Kdenlive. Some video packages also have a separate
> slideshow functionality. These slideshows are sometimes generated with
> a lower quality as the changes from frame to frame are almost zero,
> unless you start to use fancy transitions in which case you need some
> intelligence to create slideshows with low bandwidth on the slide
> itself and high bandwidth on the transitions (2-pass encoders, same
> for video).
> c. If b is true, can you put in some high/low quality setting in case
> transitions are used.

The slideshow uses an MLT filter that does the transition. Maybe there
are some bugs in it, I will try to make some tests.

>
> 3. Random transitions.
> Some time ago I asked for the possibility of random transitions in a
> slideshow. I still have that wish. I'm considering writing a Kommander
> script to do this using the DVD-slideshow tools, but it would be very
> nice if Kdenlive could do this (which also means that I don't have to
> do it: yes, I admit I'm lazy). On the other hand: if (not when) I
> finish this, I will share it with everyone who is interested.
>

Yes, I remember the random transition request, but currently the MLT
effect used for slideshow does not allow this. So don't expect this
feature too soon...


jb