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Feature #3976

Multicast

Added by bebek balap over 4 years ago. Updated about 4 years ago.

Status:
New
Priority:
Normal
Category:
Streaming
Target version:
-
Start date:
2016-09-13
Due date:
% Done:

0%

Estimated time:

Description

Request Multicast
Have 100 client and watch same HD channel,without multicast is wasteful bandwidth.

Thanks

History

#1

Updated by bebek balap over 4 years ago

Request Multicast
Hi, with kodi and Tvh HTSP Client addon ,have >100 client and watch same HD channel,without multicast is wasteful bandwidth.
anyway to reducing network/bandwidth usage ....

Thanks

#2

Updated by C K over 4 years ago

use vlc or ffmpeg to convert a normal stream to a multicast:

@Server:

ffmpeg -i http://localhost:9981/play/stream/channel/1883163b78aaa113ec49823faf64b83d -f mpegts udp://236.0.0.1:2000

@Client (mplayer for example):

mplayer -demuxer +mpegts -framedrop -benchmark "ffmpeg://udp://236.0.0.1:2000?fifo_size=100000&buffer_size=10000000" 

see https://trac.ffmpeg.org/wiki/StreamingGuide#Pointtopointstreaming

But indeed, multicast support "out-of-the-box" would be great

#3

Updated by Hanspeter Müller over 4 years ago

That's not gonna work with tvheadend, you cannot do htsp over multicast, with multicast you need a channel permanently "broadcasting", whether someone is watching or not. Meaning, for every available channel, you would need tvheadend to subscribe and send it to multicast, so you would have to lockdown a physical tuner for every channel/mux...

#4

Updated by C K over 4 years ago

Edit: the correct ffmpeg command line (Version N-80901-gfebc862) is:

ffmpeg -re -i http://localhost:9981/play/stream/channel/1883163b78aaa113ec49823faf64b83d -vcodec copy -acodec copy -f mpegts udp://236.0.0.1:2000
#5

Updated by C K over 4 years ago

Hanspeter Müller wrote:

That's not gonna work with tvheadend, you cannot do htsp over multicast, with multicast you need a channel permanently "broadcasting", whether someone is watching or not. Meaning, for every available channel, you would need tvheadend to subscribe and send it to multicast, so you would have to lockdown a physical tuner for every channel/mux...

He's talking about one channel

#6

Updated by Hanspeter Müller over 4 years ago

edit: my answer was to the OP, not to K C, he posted while i was composing ;)

#7

Updated by Hanspeter Müller over 4 years ago

@ C K

no, not really, he talks about "kodi and Tvh HTSP Client addon", so he thinks he can use tvheadend the way it's working now, just with multicast, and thats not gonna work... But yeah, it would be possible to stream a few channels permanently, but then your vlc-solution is much simpler ;)

#8

Updated by saen acro over 4 years ago

At less feature will be helpful and with clients with STB watching same channel in LAN
vote +1

#9

Updated by Pablo R. over 4 years ago

Yes, it looks good +1

#10

Updated by bebek balap over 4 years ago

C K wrote:

use vlc or ffmpeg to convert a normal stream to a multicast:

@Server:

[...]

@Client (mplayer for example):
[...]

see https://trac.ffmpeg.org/wiki/StreamingGuide#Pointtopointstreaming

But indeed, multicast support "out-of-the-box" would be great

vlc can't handle 100+ channel

#11

Updated by Antti Lehtinen over 4 years ago

bebek balap wrote:

Request Multicast
Hi, with kodi and Tvh HTSP Client addon ,have >100 client and watch same HD channel,without multicast is wasteful bandwidth.
anyway to reducing network/bandwidth usage ....

Thanks

MuMuDVB can provide the multicast streams if you need multicasting. If tvheadend were to provide the multicast stream, that would break at least the current timeshifting capability: If one of the subscribers presses pause during the live tv stream, what would happen? -> Timeshifting would need to be implemented in the client.

Don't get me wrong, in general I love the idea of multicasting and have been experimenting with it since the 90's. The biggest problem is, that neither WiFi nor wired consumer level network gear support multicasting properly even though the specs might indicate that they will (so few people even try multicasting). The second problem is, that the ISP usually limit multicasting within their own network. Especially if they offer their own IPTV service.

To summarize: Please think about the timeshfting case. Please acknowledge the problem with ISPs and consumer level gear/wifi.

Tvheadend can pickup the multicast streams created by the MuMuDVB as a regular IPTV broadcast.

BR
Andy777

#12

Updated by Antti Lehtinen over 4 years ago

In addition: UDP itself is a "firehose". It shoots packets and hopefully the receiving end catches them. That works well in unicast or in wired multicast. You can of course always write code that has IDs/counters for UDP packets and then retransmittes (mimicking TCP). However the packet loss (without the inbuilt retransmission like in TCP) can be substansial in WiFi connections resulting stream that is hard to decode (or impossible when the decoder is hardware decoder which you have no control of). Self built retransmission will also break the multicast/udp/single stream principle.

BR,
Andy777

#13

Updated by saen acro over 4 years ago

@Antti Lehtinen
There is a very simple solution for multicast environment and timeshift,
just exclude timeshift from multicast and use standard stream from NVOD storage.

Multicast is useful for hotel/hospital solutions also, not only ISP.

#14

Updated by bebek balap over 4 years ago

Mumudvb can work with cccam ? or mumudvb can get tvsource from tvheadend with decrypt ?

now i use tvheadend - cccam - kodi tvheadendhtspclient ( android box on client ) .

#15

Updated by saen acro over 4 years ago

Astra also works, but what is reason to use lot of software's, when only one can do all.

#16

Updated by bebek balap about 4 years ago

saen acro wrote:

Astra also works, but what is reason to use lot of software's, when only one can do all.

hallo my fren, what software can do all ?

< multicast, cccam, 100++ channel, 100++ client with stb ( andorid box ) >

#17

Updated by saen acro about 4 years ago

Paid version of Cesbo Astra

But for me it's better TVH to have multicast and this #3992

p.s.
if some one want to write web ui for end client devices,
can provide collection of smart tv and stb ui examples and key mapings.

#18

Updated by bebek balap about 4 years ago

saen acro wrote:

Paid version of Cesbo Astra

But for me it's better TVH to have multicast and this #3992

p.s.
if some one want to write web ui for end client devices,
can provide collection of smart tv and stb ui examples and key mapings.

just see Cesbo astra,its good but its monthly fee : (

still waiting for multicast tvheadend or free software

Thanks for your info my fren : )

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