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All posts by js

Below are all of js's postings, with the most recent are at the bottom of the page.

J
Film 4 +1
Sunday 8 December 2019 11:05PM

StevensOnln1: Like a youtube live stream that has rewind enabled? Wouldn't that require personal streams?

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FR
J
Film 4 +1
Monday 9 December 2019 8:44PM

StevensOnln1: Well, if that's the case, it's incredibly inefficient, costly, and ultimately, unworkable.

With their moans and groans about how few billions we pay them to provide television, how can it be justified?


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GB
J
Film 4 +1
Monday 9 December 2019 11:37PM

StevensOnln1: Well, perhaps you can enlighten us on how it's technically possible to deliver millions of individual streams - which is the question I asked in the first place.

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US
J
Film 4 +1
Tuesday 10 December 2019 4:20AM

Chris.SE: Thanks, I'll take a look later with a VPN and Tor: If you sup with the Devil use a long spoon.

Meanwhile:

Unicast
In computer networking, unicast refers to a one-to-one transmission from one point in the network to another point; that is, one sender and one receiver, each identified by a network address. More at "Wikipedia"


Multicast:
In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution ... More at "Wikipedia"

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US
J
Film 4 +1
Wednesday 11 December 2019 3:50AM

Chris.SE: Thanks again. So, given that an iplayer stream is 5Mbps, we have 5Gbps per 1000 and 5Tbps per million - the engines won't stand it captain! Well, maybe a million, but 20 million?

Searching for "BBC multicast" brought me to an interesting page:

"Multicast streaming

By combining multicast distribution to edge caches with unicast distribution downstream we are also able to support the large installed base of standards-based unicast media players. And using this hybrid model we can even support product features such as "live restart" in a scalable manner."


Dynamic Adaptive Streaming over IP Multicast - BBC R&D


Presumably "live restart" is what we've been discussing. I'm not sure what "in a scalable manner" means.

An early BBC attempt at using Multicast "a smarter way of serving large numbers of people" is here:

Multicast | Radio

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J
All free TV channels in the UK
Wednesday 15 January 2020 9:02AM

The BBC changed the way their EPG was produced in the last year or so.

The lack of HD Simulcast Event Linkage descriptors was one notable change.

Recently, these have been reintroduced, though not yet implemented for some channels.


For Freeview, the channels that now have HD Simulcast Event Linkages are:

BBC FOUR, BBC ONE, BBC TWO, CBeebies and Channel 5.


For Freesat, the channels that now have HD Simulcast Event Linkages are:

BBC FOUR, BBC ONE, BBC TWO, CBeebies, ITV, STV and UTV.

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GB
J
All free TV channels in the UK
Wednesday 15 January 2020 9:05AM

More BBC EPG Blunders:

All the HD Simulcast Event Linkage addresses for BBC FOUR and CBeebies are wrong.

They are wrong because they point to com7 instead of com8.

As everyone knows, the TSID of com7 is A000 and the TSID of com8 is B000.

An example:

*****************************************
CBeebies, Wed 22 Jan 15:45 - 15:55: Tinpo
How I Roll. Delivery Po needs to deliver her delicate cargo, however the road is anything but smooth. Also in HD. [S]

Linkage: 233A.A000.B030 = not_found, event_simulcast, target_listed, target_event_id = 64EC
Linkage: 233A.A001.B030 = not_found, event_simulcast, target_listed, target_event_id = 64EC
MPEG-2 video, 16:9 aspect ratio without pan vectors, 25 Hz (und)
MPEG-1 Layer 2 audio, stereo (2 channel) (eng)
DVB subtitles (normal) with no monitor aspect ratio criticality (eng)
crid = /m/3WSB, Type: 31 (item), crid = /m-Z4R, Type: 32 (series)
eventID = 666A, ONID.TSID.SID = 233A.1048.1240, default_authority = fp.bbc.co.uk, 706 MHz, uhf 50
*****************************************

The intended target is:

*****************************************
CBeebies HD, Wed 22 Jan 15:45 - 15:55: Tinpo
How I Roll. Delivery Po needs to deliver her delicate cargo, however the road is anything but smooth. [S] [HD]

DVB subtitles (normal) for display on a high definition monitor (eng)
H.264/AVC high definition video, 16:9 aspect ratio, 25 Hz (und)
HE-AAC audio, stereo (eng)
crid = /m/3WSB, Type: 31 (item), crid = /m/Z4R, Type: 32 (series)
eventID = 64EC, ONID.TSID.SID = 233A.B000.B030, default_authority = fp.bbc.co.uk
*****************************************


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GB