logo

Live Production Software Forums

www.vmix.com

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

Notification

Icon
Error
bm decklink duo 2 50i input conversion psf
Options
Go to last post Go to first unread
Previous Topic Next Topic
h2video.nl  
#1 Posted : Tuesday, February 14, 2017 5:01:00 AM(UTC)
h2video.nl

Rank: Advanced Member

Groups: Registered
Joined: 3/7/2012(UTC)
Posts: 503
Man
Location: The Netherlands

Thanks: 9 times
Was thanked: 45 time(s) in 39 post(s)
I output a 1080i50 signal over sdi to a bm decklink duo 2 card.

I notice the card will automatically convert this to a progressive psf format. I can then input this as 25p in vmix. but I can also chose 50i but vmix will not blend it to progressive, since it already is semi progressive (Psf means progressive segmented file a semi progressive interlaced intermediate format...)

Anybody any thoughts on this. there is no method to set the card to just accept interlaced and let vmix handle the de interlacing...

just a niti gritti thing but I just like to be in full controle and determine exactly what will happen to what input etc.

stefan
Back to top
WWW

Wanna join the discussion?! Login to your vMix Forums forum account, or Register a new forum account.
Back to top  
DWAM  
#2 Posted : Tuesday, February 14, 2017 5:15:32 AM(UTC)
DWAM

Rank: Advanced Member

Groups: Registered
Joined: 3/20/2014(UTC)
Posts: 2,721
Man
France
Location: Bordeaux, France

Thanks: 243 times
Was thanked: 794 time(s) in 589 post(s)
Hi Stefan,

I think this became the default behaviour with newer BMD drivers. With older versions we had the choice between Interlaced, Psf or Progressive.

Did you try to force Interlaced input in vMix?
Back to top
WWW
h2video.nl  
#3 Posted : Tuesday, February 14, 2017 6:04:40 AM(UTC)
h2video.nl

Rank: Advanced Member

Groups: Registered
Joined: 3/7/2012(UTC)
Posts: 503
Man
Location: The Netherlands

Thanks: 9 times
Was thanked: 45 time(s) in 39 post(s)
yes, but vmix will ignore it and see it as a progressive input. no error messga or black screen though. the standard behaviour when you input a 50i input as progressive or the other way around.

I will now input the 50i input as 25p but this is still something to keep an eye on because maybe not all 50i inputs are created equal....

stefan
Back to top
WWW
admin  
#4 Posted : Tuesday, February 14, 2017 10:42:14 AM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,214
Man
Location: Gold Coast, Australia

Was thanked: 4301 time(s) in 1523 post(s)
Hi,

I can confirm the Decklink cards do not deinterlace video at all. The psf checkbox in the Blackmagic control panel is to do with output only.
(So you can send a 25p signal out to devices that only support 50i for example)

In vMix if you select 50i, then vMix will deinterlace this if the main frame rate is 25p, or keep it as is if the main frame rate is 50i as well.

So if you untick the interlaced checkbox when adding the input in vMix, and don't see the typical interlaced lines when panning the camera, then the camera
is actually sending PsF over 50i and not the full interlaced video.
Also any camera set to a 1/25 shutter will also look like PsF video.

Hope this helps,

Regards,

Martin
vMix
Back to top
WWW BLOG
Users browsing this topic
Guest
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.

Privacy Policy | Powered by YAF.NET | YAF.NET © 2003-2024, Yet Another Forum.NET
This page was generated in 0.087 seconds.