On Mon, Oct 14, 2013 at 12:54 PM, Janne Liljeblad
<janne.liljeb...@gmail.com> wrote:
> Hello,
>
>
> I was adding watermark functionality to Flowblade and it worked fine.
> I used the following type of code:
>
> watermark = mlt.Filter(self.profile, "watermark")
> watermark.set("resource","/home/janne/watermark.png")
> self.tractor.attach(watermark)
>
> The problem was that the watermark disappeared every time I changed
> the length of the Playlist. Changing positions of clips had no effect.
> Is this a bug or should I just work around this?
watermark.set("composite.always_active", 1)
That property is documented in mlt_transition.h (watermark is a
transition wrapper), but yeah that is not exactly obvious.
P.S. When reporting something like this, it is useful to know that it
is not a problem with some other filter like "sepia."
> Also the filter_watermark.yml has no parameter "resource", instead it has:
>
> - identifier: argument
>
> for file/URL.
OK, but you can find this in other metadata as well. Services can take
a constructor argument, but there is no clear way to document that in
the metadata. Usually, there is a property like "resource" to back it
or to provide alternative than arg, but we do not want to necessarily
be redundant (but some metadata are)? I have not exactly decided what
to do here. Do you have a preference? Are you using it to generate UI?
>
> Regards,
>
> Janne
>
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