How to combine two sources (2 vlan) of IPTV into one vlan for broadcasting to subscribers using Cisco Catalyst 2960?

Question

Cisco

There is a small network through which iptv is broadcast to subscribers in vlan. There was a need to accept a certain number of channels from another source and direct this flow to the existing vlan.
The network mainly uses D-Link des 1228me switches. We also have a cisco catalyst 2960 at our disposal, which we can replace with a cisco catalyst 3560 if necessary.
upd: It also became possible to use the Cisco 10000 for this purpose.
If possible, describe the solution in as much detail as possible. Thanks in advance!
The approximate network topology is shown below:

Answer 1

Read about MVR.
There is no PIM on the 3560 licensed with IP Base.

Answer 2

"Need" a multicast router that can PIM (cisco catalyst 3560 seems to be able to) it will receive multicast from two (three, four, etc.) sources and send it to the network.
Some information about multicast: Part nine. Multicast

Answer 3

I can offer a few offhand solutions, but they will require at least one L3 switch. It is needed at least for mixing traffic (routes) from different vlans
1) the most correct - all vlans with multicast go through L3 switch, on it you prohibit (acl, igmp filter) certain groups from the desired vlan
2) the most scalable - on L3- all vlans enter the switch and PIM rises, routes for groups are explicitly indicated (ip mroute static)
3) the most fabulous - clients use igmp v3 with an explicit indication of the source
4) the most moronic, but not requiring any other equipment - all channels are in one vlan, and on client ports hang acl on the necessary src-dst addresses. However, the same acl can be hung on ports to which multicast sources are connected