- Posts: 1
- Joined: Thu Aug 09, 2018 8:40 am
- Real Name: Lukas Lange
Hello Sevenlive,
The issue is that ffmpeg doesn't preserve the interlaced status through the entire pipeline. Hence when it gets to the decklink output libavdevice module the module chooses 1080p/25 (i.e. PSF). I've got patches to preserve this info so the proper output mode is chosen, but they haven't made it upstream yet.
In the short term, you can use the DesktopVideo GUI to set enable PSF mode. This will cause the 1080p/25 to be output as 1080i/50, which will accomplish the same objective if your equipment is not using the payload identifier to know it's in PSF mode.
Unfortunately there also is not a way to force a specific output mode in the decklink libavdevice module, which is also on my TODO list.
Devin Heitmueller
LTN Global Communications