Doom9's Forum - View Single Post - How to invoke another filter (sometimes) on my filter's output?

wonkey_monkey · 7th December 2016, 16:22

Hi,

I'm writing a filter which may, at times, need to display a message. I'm something of a trial-and-error programmer so I've never quite grasped the proper use of classes and invoking in AviSynth

My filter has a number of input clips and produces an output clip. My GetFrame does the following standard thing:

Code:

PVideoFrame dst=env->NewVideoFrame(vi);

to create a new output frame, then writes to the buffer given by dst->GetWritePtr(); and returns dst.

What I'd like to know is: before I return, can I then invoke some other filter (subtitle, specifically) on what I've just painted? If so, what's the recommended way? I need to do inside GetFrame, as only some frames will be getting subtitled.

Previously I've only ever invoked filters on input clips, prior to them being read by my GetFrame.

---

Followup question: if my filter is internally multithreaded, is there some way/need to inform newer versions of AviSynth (+, MT, etc, I don't follow them much) of this so it doesn't try to do it itself?

7th December 2016, 16:22	#1 \| Link
wonkey_monkey Formerly davidh***** Join Date: Jan 2004 Posts: 2,496	How to invoke another filter (sometimes) on my filter's output? Hi, I'm writing a filter which may, at times, need to display a message. I'm something of a trial-and-error programmer so I've never quite grasped the proper use of classes and invoking in AviSynth My filter has a number of input clips and produces an output clip. My GetFrame does the following standard thing: Code: PVideoFrame dst=env->NewVideoFrame(vi); to create a new output frame, then writes to the buffer given by dst->GetWritePtr(); and returns dst. What I'd like to know is: before I return, can I then invoke some other filter (subtitle, specifically) on what I've just painted? If so, what's the recommended way? I need to do inside GetFrame, as only some frames will be getting subtitled. Previously I've only ever invoked filters on input clips, prior to them being read by my GetFrame. --- Followup question: if my filter is internally multithreaded, is there some way/need to inform newer versions of AviSynth (+, MT, etc, I don't follow them much) of this so it doesn't try to do it itself? __________________ My AviSynth filters / I'm the Doctor Last edited by wonkey_monkey; 7th December 2016 at 16:29.