Setting deinterlace while video playing

[sgraves66]

I'm not sure if this is the correct forum; however, I'm developing a multi-platform media studio and am evaluating VLC as the main video processor.
I'm using c/c++ with libvlc directly; however, I'm unsure as to how to add "deinterlace" filter while video is running.

Calling 'VLC_VariableGet(ID, "deinterlace-mode", type)' returns -30. I'm almost positive that this is incorrect, but am unsure how to proceed.

Adding "--vout-filter deinterlace" as an argument to 'libvlc_new(...)' has no effect.

[sgraves66]

Well, I was passing in invalid data to call. Still looking for a way to add the deinterlace filter after playback has begun. Any assistance would be great.