[FFmpeg-devel] Question regarding inter-filter communication

[wm4]

On Mon, 13 Apr 2015 08:28:18 -0700
Bahram Dahi <bahram.dahi at gmail.com> wrote:

> This is my first email to the list and I apologize in advance if I'm
> breaking some sort of rule by doing a mass email.
> 
> I am developing a couple of specialized filters for ffmpeg, where the first
> filter would find some regions of interest (ROIs) on some frames and the
> second filter (if present in the filter chain) would mark those ROIs. To be
> able to achieve this, I need a way to pass the ROI information (let's say
> an array of x,y points) in any reasonable format to the second optional
> filter. Is there a way to do so?
> 

Either side data (which would need a new type in libavutil - these
things are not designed to be extensible), or the AVDictionary metadata
field.