Having got out the ladders, erected the scaffold tower and played with
different aerials for a couple of days, I got my system back to
operating correctly. So it was time to retune all the TVs and PVRs. A
job I hate. All went well on the TVs and the HD PVR, all the channels
were there. Then I tried the other two PVRs which are SD units. That's
when I discovered that some idiot has broadcast channel 71 SD (Motors
TV) with HD encoding. As a result any PVR with DVBT (SD) decoding cannot
receive this SD channel. Also other programs have changed channels. Why
on earth is this stupidity allowed? I'm sick and fed up with retuning
TVs every few months.
It's not the only SD channel on com7. Al Jazeera Arabic is also there
in SD. DVBT2 MUXes are often called HD MUXes but their is no technical
reason why SD channels shouldn't use them too, and there are
advantages in doing so.
The word is there is going to be more of this happening, in fact, the
word is that DVBT will become obsolete soon so if your equipment isn't
T2 (HD to most people) then your're fucked.
VHF was only around 450 years IIRC 1936 - 1985, but was more or less
obsolecesent by the 70's
UHF ran from the 70s top the 90s as a viable service with no
alternatives and was finally ditched in 2012 as digital took over.
a mere 40 years.
The fact is that TVS are nowhere near as expensive in real terms as they
used to be, and buying a new one is not big deal for most people
Everything you read in newspapers is absolutely true, except for the
rare story of which you happen to have first-hand knowledge. – Erwin Knoll
So 45 and 40 years...
FM radio even longer (75 years IIRC)
Now remind me how long have SD-DVB been around - and DAB radio?
Philips/Sony did it right with the music CD format - I have actually
gone back to buying those (at a knock down price in HMV
opportunistically) as Amazon MP3s are so piss poorly encoded. Even my
middle aged ears can hear half the treble is gone on decent equipment.
I really take my hat off to Philips/Sony - they managed to invent a very
low compromise standard that still knocks the crap out of the competition.
Whereas I look at digital terrestrial TV and think "what a load of crap"
as the artifacts move through the sky and forest scenes.
You should see some of the badly encoded DVDs I have seen, the face
moves but the head doesn't or even moves in a different direction.
These were commercial ones too not downloaded knock offs, they tend to
be done better IME.
I know, I built a demo system for TV over ADSL with help from the BBC
technology group as part of a tender.
We only had about 1.3 megabits to play with.
When the Olympic swimming was on you could watch square water droplets
fly around the swimmers.
This was probably more ten years ago now and Sky, BT and the BBC are
still doing what I said to them as being obvious (but they didn't appear
to think so)..
if you control the playback platform then you don't need all the
real-time networking protocols, you just need to buffer and as long as
the average bandwidth is high enough the customer wont care. Nearly all
the so called real-time protocol stuff was to allow auditing so they
could charge you for what you watched, they do that on the platform instead.
Funny enough Virgin said that wasn't any good and that they would use
the vast number of channels they had to play back programmes with one
channel per user. Somehow I don't think that lasted very long as the new
boxes use IP the same as BT, and Sky.
It was a nice demo for lots of visitors but the BBC decided they wanted
their ~million pounds worth of multiplexors, de-multiplexors, encoders
and decoders back. We had four or five racks full of BBC stuff at the
time being a play out suite as well as receiving live broadcasts and
Ah.. the good old days. 8-)
When you look at the bandwidth saved then using SD mpeg2 has to go soon,
unless they charge more for SD. Just think of all the extra channels
Sky are trying to get everyone to have a HD box ATM so they must be
going to scrap SD encoding soon.
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