Is it possible to add more than one GstVideoRegionOfInterestMeta metadata to a single buffer?

[Nicolas Dufresne]

Le mercredi 16 février 2022 à 18:06 +0000, José Carlos Cazarin Filho via
gstreamer-devel a écrit :
> Hello! I'm trying to do something which I'm not sure it is supported. I'm
> writing a plugin in which I call gst_buffer_add_video_region_of_interest_meta
> in a loop, adding (presumably) more than one GstVideoRegionOfInterestMeta to a
> single buffer.
> In another plugin that consumes the output of the previous plugin, I call
> gst_buffer_iterate_meta in a loop to try to retrieve the information. But I
> can only retrieve the first metadata successfully. After the first one,
> gst_buffer_iterate_meta returns NULL.
> So, my question is: is it possible to have multiple
> GstVideoRegionOfInterestMeta metadata in the same GstBuffer?

Yes, you can add multiple ROI. Here's an example of iterating of them:

https://gitlab.freedesktop.org/gstreamer/gstreamer/-/blob/main/subprojects/gst-omx/omx/gstomxvideoenc.c#L2951

> Thanks!
>