Discard all but the first structure from @caps. Useful when
fixating.
This function takes ownership of @caps and will call gst_caps_make_writable()
on it if necessary, so you must not use @caps afterwards unless you keep an
additional reference to it with gst_caps_ref().
Discard all but the first structure from @caps. Useful when fixating.
This function takes ownership of @caps and will call gst_caps_make_writable() on it if necessary, so you must not use @caps afterwards unless you keep an additional reference to it with gst_caps_ref().
Return: truncated caps