Finds the features in caps at index, and returns it.
WARNING: This function takes a const GstCaps *, but returns a
non-const GstCapsFeatures *. This is for programming convenience --
the caller should be aware that features inside a constant
#GstCaps should not be modified. However, if you know the caps
are writable, either because you have just copied them or made
them writable with gst_caps_make_writable(), you may modify the
features returned in the usual way, e.g. with functions like
gst.caps_features.CapsFeatures.add.
Finds the features in caps at index, and returns it.
WARNING: This function takes a const GstCaps *, but returns a non-const GstCapsFeatures *. This is for programming convenience -- the caller should be aware that features inside a constant #GstCaps should not be modified. However, if you know the caps are writable, either because you have just copied them or made them writable with gst_caps_make_writable(), you may modify the features returned in the usual way, e.g. with functions like gst.caps_features.CapsFeatures.add.