Hello Prashant,
If you have two links and your routing protocol uses ECMP (Equal-Cost Multipath Routing) then this doesn’t mean that PIM will use both paths automatically.
By default, PIM will forward traffic on the interface where you have the highest IP address PIM neighbor. For example, if you have R1-R2 with two links and R2 has 192.168.12.2 on link 1 and 192.168.21.2 on link 2 then the second link will be used to forward multicast traffic.
Also, keep in mind that multicast isn’t really a thing on the Internet. Out of the box, BGP also doesn’t use multiple paths but that’s something you can configure:
Hope this helps!
Rene