Its not supported, I wish it was, this would be so good.
@ppanagiotis thanks for the pointer, but I encountered the same issue as @Sander_Wolschrijn
I have tried platform as both yamaha_musiccast and musiccast_yamaha
Card as shown in Lovelace UI:
Error message when attempting to “group”
I installed Mini Media Player v1.11.0 from HACS
@Sander_Wolschrijn did you mange to get groups working for Yamaha Musiccast devices?
thanks!
[Edit 3 hours later]
It works!!!
I was confused between the instructions for:
- HACS Frontend: Mini Media Player and
- HACS Integration: Musiccast Yamaha
I uninstalled/reinstalled HACS Integration: Musiccast Yamaha and changed the config.yaml media_player platform entiries to musiccast_yamaha
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Thanks for your post. I gave up on this and moved on to other interesting stuff to do with home assistant. But your reply awoke me again 
. Used your method and now everything is working fine.
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@YetAnotherDave, hello.
Did you manage that mini player is working and you have group of musiccast devices? could you please share code with mi?
thank you for you help
Filip
@Filip_Kotian this is the change that made it work for me:
All with fixed IP address and a “unique” port.
Along with this Entities Card Configuration:
icon: 'mdi:audio-video'
type: entities
entities:
- type: 'custom:mini-media-player'
group: true
entity: media_player.tv_room_rx_479_main
name: TV Room
artwork: cover
speaker_group:
platform: musiccast_yamaha
expanded: false
entities:
- entity_id: media_player.tv_room_rx_479_main
name: TV Room
- entity_id: media_player.office_main
name: Office
- entity_id: media_player.wx10_livingroom_main
name: Living Room
- entity_id: media_player.wx21_diningroom_main
name: Dining Room
- type: 'custom:mini-media-player'
group: true
name: Office
entity: media_player.office_main
- type: 'custom:mini-media-player'
group: true
name: Living Room
entity: media_player.wx10_livingroom_main
- type: 'custom:mini-media-player'
group: true
name: Dining Room
entity: media_player.wx21_diningroom_main
@YetAnotherDave, have you done anything about this information below?
from the github pymusiccast instruction.
It is confusing and I got stuck… I followed your method, but still get the same error message
Failed to call service yamaha_musiccast/join. Service not found.
Yes, I too was confused. I believe the problem is that you are using yamaha_musiccast
What you need is musiccast_yamaha
See my earlier post, partially quoted here:
Thanks, that’s it!!!
You have to have it correct in the configuration.yaml file → musiccast_yamaha
Works perfect now.
Sorry for refreshing the topic, but I think I don’t understand what should be the final configuration. Is that the one posted by @YetAnotherDave?
This post is how I have it configured. It still works for me 
core-2021.5.5
supervisor-2021.06.8
Home Assistant OS 5.13
HACS 1.12.4
Musiccast Yamaha v0.5
Mini Media Player v1.12.1
I also have some problems getting my Musiccast system up and running with Homeassistant. I browsed the examples here and on GitHub - ppanagiotis/pymusiccast: Group MusicCast Speakers with Home Assistant to do the installation. I made a card in Lovelace like this:
type: entities
entities:
- type: custom:mini-media-player
group: true
entity: media_player.esszimmer
name: Esszimmer
toggle_power: false
artwork: cover
hide:
icon: true
power_state: false
speaker_group:
platform: musiccast_yamaha
expanded: false
entities:
- entity_id: media_player.esszimmer_main
name: Esszimmer
- entity_id: media_player.kuche_main
name: Küche
- entity_id: media_player.schlafzimmer_main
name: Schlafzimmer
- type: custom:mini-media-player
artwork: cover
group: true
name: Küche
hide:
icon: true
controls: true
progress: true
source: true
info: true
power_state: false
entity: media_player.kuche
toggle_power: false
- type: custom:mini-media-player
artwork: cover
group: true
name: Schlafzimmer
hide:
icon: true
controls: true
progress: true
source: true
info: true
power_state: false
entity: media_player.schlafzimmer
toggle_power: false
This is what the card looks like:
I also add my devicecs in the configuration.yaml file. My problem is this: I cannot control or group my devices. When I click the slider, nothing happens. The slider does not move. I can only turn the devices on / off and adjust the volume.
What am I doing wrong?
Hi Guys
Has the Musiccast Group Issue been resolved as i am still recieving the Error that service not found
Also cannot get it working with the ‘official’ aiomusiccast-0.9.1 (https://github.com/ppanagiotis/pymusiccast says it’s deprecated), all documentation I find is very outdated.
I’m on 2021.9.3, the integrated MusicCast (at least their docu says) should provide a join routine.
But it tells there is no service musiccast/join.
Here’s how it looks with platform set to mediaplayer:
This is my custom card:
type: entities
entities:
- type: custom:mini-media-player
group: true
entity: media_player.rxv_werkstatt
name: RXV Werkstatt
toggle_power: false
artwork: cover
hide:
icon: true
power_state: false
source: false
speaker_group:
platform: media_player
expanded: false
entities:
- entity_id: media_player.rxv_wohnen
name: Wohnzimmer
- entity_id: media_player.rxv_kueche
name: Küche
- type: custom:mini-media-player
group: true
entity: media_player.rxv_wohnen
hide:
icon: true
controls: true
progress: true
source: true
info: true
power_state: false
- type: custom:mini-media-player
group: true
entity: media_player.rxv_kueche
hide:
icon: true
controls: true
progress: true
source: true
info: true
power_state: false
if I change the speaker_group platform to musiccast, it looks like this:
Played a bit, found a workaround:
service: media_player.join
target:
entity_id:
- media_player.rxv_wohnen
data:
group_members: media_player.rxv_wohnen
added a button card for it.
This is my screenshot of Musicast devices.
I will try the button setup but that would require multiple buttons if a eventually add all musiccast devices in each room
My Card View
Do you know if there is currently an Open Issue for this intergration
I think not, I opened one yesterday: https://github.com/vigonotion/aiomusiccast/issues/20.
You do use the (deprecated) musiccast_yamaha platform,
but I want to get it working with the ‘official’ platform, which is now musiccast.
Take a look at my previous post, I think it is an issue of mini-media-player, not of the musiccast platform.
Just tried to add the master like you did in your screenshot,
the error stays the same:
Yep, it’s a (solved) issue with mini-media-player, which does not honor the new join method in media_player platform (https://github.com/kalkih/mini-media-player/issues/528). There is no bundled release yet.
If you use platform type media_player, it works. This is my config, it works for me. The join service is part of the media_player scope I guess.
- type: custom:mini-media-player
entity: media_player.1st_floor_living_receiver
artwork: cover
artwork_border: true
power_color: true
show_source: true
sync_volume: true
expanded: true
speaker_group:
platform: media_player
show_group_count: true
entities:
- entity_id: media_player.2nd_floor_office_speakers
name: Musiccast Office
- entity_id: media_player.2nd_floor_loft_receiver
name: Musiccast Loft
- entity_id: media_player.1st_floor_living_receiver
name: Musiccast Living
- entity_id: media_player.basement_cinema_receiver
name: Musiccast Cinema
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