Gst-launch-1.0 (v1.80) Decklink Interlaced Video

[Dave Johnstone]

Hi,

I am trying to play an SD interlaced file out on a Blackmagic Decklink 
card but having troubles.  I cannot get the following pipeline to link -
/gst-launch-1.0 uridecodebin uri=file:///Volumes/Video/race.mov ! 
autovideoconvert ! decklinkvideosink mode=3/
If I deinterlace then interlace with

/uridecodebin uri=file:///Volumes/Video/race.mov ! deinterlace ! 
autovideoconvert ! interlace field-pattern=2:2 ! videoscale ! videorate 
! decklinkvideosink mode=3

/This works but if I add audio

/uridecodebin uri=file:///Volumes/Video/race.mov name=decoder decoder. ! 
deinterlace ! autovideoconvert ! interlace field-pattern=2:2 ! 
videoscale ! videorate ! decklinkvideosink mode=3 decoder. ! 
audioconvert ! decklinkaudiosink/

The audio plays at the correct speed and pitch but stutters as if half 
the samples are missing.

What is the correct pipeline for playing interlaced files to a Decklink 
card in interlaced mode?

My source files are DV in a QT container, also tried ProRes. Using 
pre-compiled binaries (v1.8) for OS X (Yosemite).

As for HD, even the above trick does not work.

Regards,

Dave.

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