logo

Live Production Software Forums


Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Options
Go to last post Go to first unread
erzyk  
#1 Posted : Monday, June 15, 2020 6:31:31 AM(UTC)
erzyk

Rank: Newbie

Groups: Registered
Joined: 6/15/2020(UTC)
Posts: 2
Poland

Hi,

last time, using vMix as a playout and title system I noticed that the alpha channel on all output behaves faulty on fade transition. I recorded a short video showing this (in the bopttom right corner there is a NDI monitor with checkerboard enabled).
The problem becomes visible every time when I try to fade into a source with transparency (PNG files, vMix titles etc.). The former content is not faded out in alpha channel, but is cut hard on the transition end. It applies to fade and merge transitions. It works perfectry the other way round - fading from content with transparency into something with no transparency.

Link to my recording

The improper transparency fade-in applies to alle alpha (premultiplied and straight) configurations...

What can be the problem with no proper fading out of the alpha channel?
IceStream  
#2 Posted : Monday, June 15, 2020 9:21:05 AM(UTC)
IceStream

Rank: Advanced Member

Groups: Registered
Joined: 3/7/2012(UTC)
Posts: 2,333
Man
Location: Canada

Thanks: 32 times
Was thanked: 423 time(s) in 400 post(s)
@ erzyk

As near as I can tell, that is the default behavior of the "Fade" Transition, that is, the Preview screen fades in overtop of the Program screen (it is not a cross fade where the program screen fades as well).
As such, when using an Input with alpha channel, once the transition is 99% complete, the bottom screen will jump to the preview screen, which will look like a cut because of the alpha channel.


Ice
erzyk  
#3 Posted : Tuesday, June 16, 2020 12:44:48 AM(UTC)
erzyk

Rank: Newbie

Groups: Registered
Joined: 6/15/2020(UTC)
Posts: 2
Poland

OK, so this means that there is no option to do a crossfade between a source or two sources with alpha?
Users browsing this topic
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.