Re: [Mlt-devel] slideshow with melt

[Dan D. <da...@de...>]

On Sat, Dec 19, 2009 at 4:41 AM, Rob Canning <ro...@go...> wrote:
> Dan Dennedy said :
>> On Fri, Dec 18, 2009 at 1:56 PM, Rob Canning <ro...@go...> wrote:
>> > hello,
>> >
>> > i have only been looking at melt for a day or two so i am missing something
>> > really basic no doubt... never the less i have now joined this mail list and i
>> > say hello and thank you for loveley mlt :)
>> >
>> > ok so what i would like to do is create a slide show of all the images in a dir
>> >
>> > somthing like this:
>> >
>> > melt -group out=25 *.jpg -mix 25 -mixer luma
>>
>> You want to use .all.jpg. The shell expands wildcards, but this form
>> will let MLT do some special multi-image-file handling.
>> From a MLT source directory, see demos/mlt_slideshow for an example
>> that shows how to apply a transition between the photos:
>>
>> melt .all.jpg ttl=75 -filter luma:%luma01.pgm luma.softness=0.1
>>
>> ttl is the number of frames to show each photo.
>> %luma01.pgm is a wipe where the % prefix tells it to look in
>> $prefix/share/mlt/lumas/ for a builtin, instaled wipe. Leave out the
>> ":%luma01.pgm" to get a simple dissolve.
>> luma.softness=0.1 adds some feathering along the edge of the wipe -
>> not needed for simple dissolve.
>>
>> MLT is mainly a developer toolkit. There is not much support bandwidth
>> for general usage. Are you working on an application? If not, then
>> maybe you'd more interested in a frontend like Kdenlive or OpenShot.
>
> thanks dan,
>
> well i like using CLI and will struggle on using this way of working with mlt
> i realise answering lots of user questions in this regard is tiresome but i just
> need a few starts and then i should be able to get on with it myself...
>
> i am making notes as i go... at the moment its just a text file on my svn
> https://code.goto10.org/svn/rob/mlt/melt.examples
>
> i will tidy this up into individual help files when it gets more significant.
>
> hopefully eventually this will go some way towards increasing support bandwidth
> :)

OK, great. I can create an account for you on mltframework.org wiki if
you want to contribute there.

> next question is with regards to accessing parameters of filters:
>
> i have figured this out:
>
> melt bingbong.dv  -filter frei0r.pixeliz0r BlockSizeX=.6 BlockSizeY=.2
>
> but when i look at the frei0r.water plugin i see it has many parameters such as
> rain swirl surfer smooth etc etc.

Yes, some plugins support the metadata system, and frei0r does, so
this gives a fair amount of info:

melt -query filter=frei0r.water

> so i thought:
>
> melt bingbong.dv  -filter frei0r.water rain=1
>
> would be the solution but it doesnt work

Hmm, that should work. I am on holiday travel with my MacBook now
where the SDL output broke on the upgrade to OS 10.6. I will reboot
into Linux sometime soon and check it out. Maybe others can comment. I
see it is blacklisted in kdenlive for being unstable. Are you getting
a crash or simply no apparent effect? Maybe it needs another parameter
to give it some amplification.

-- 
+-DRD-+