iPlayer switches to secure RMTPE streaming of radio

On Sat, 08 Jan 2011 22:27:42 +0000, Richard Evans wrote:

I was thinking more of a system in the home, so that if you missed
anything you would have a chance of finding it on your hard drive.

But you wouldn't want to record *every* channel would you? The
shopping and adult chat stuff doesn't need to take up any space
(anywhere IMHO).

--
Cheers
Dave.

Dave Liquorice wrote:
On Sat, 08 Jan 2011 22:27:42 +0000, Richard Evans wrote:

I was thinking more of a system in the home, so that if you missed
anything you would have a chance of finding it on your hard drive.

But you wouldn't want to record *every* channel would you?

Probably not, which would make such a system a bit cheaper, or
alternatively you could choose to record fewer channels, but keep the
programs a bit longer.

The
shopping and adult chat stuff doesn't need to take up any space
(anywhere IMHO).

Yes although shopping channels might have lower bit rates, reducing the
advantage of not recording them. You could also miss out the +1
channels. Not recording adult channels would save some space, but
perhaps not a huge amount because they are only on part time.

I was thinking from a point of view of, firstly whether it is actually
possible to record everything. You could then potentially improve things
by being a little selective about which channels you record.

Lest say perhaps about 10Tb may be enough for most people.

Richard E.

"Richard Evans" wrote in message
...
Paul Martin wrote:
In article ,
Richard Evans wrote:

I wonder whether it's feasible to build a system that records every
program on every channel for a week. I've never got around to doing the
Maths before, but lets see.

It's not just possible: I believe it is already being done by one of
the main broadcasters.

I was thinking more of a system in the home, so that if you missed
anything you would have a chance of finding it on your hard drive.

I'm amazed if I find more than one or two hours a week of interesting TV -
regardless of channel.

On 09/01/2011 11:06, Richard Evans wrote:
Dave Liquorice wrote:
On Sat, 08 Jan 2011 22:27:42 +0000, Richard Evans wrote:

I was thinking more of a system in the home, so that if you missed
anything you would have a chance of finding it on your hard drive.

But you wouldn't want to record *every* channel would you?

Probably not, which would make such a system a bit cheaper, or
alternatively you could choose to record fewer channels, but keep the
programs a bit longer.

The
shopping and adult chat stuff doesn't need to take up any space
(anywhere IMHO).

Yes although shopping channels might have lower bit rates, reducing the
advantage of not recording them. You could also miss out the +1
channels. Not recording adult channels would save some space, but
perhaps not a huge amount because they are only on part time.

I was thinking from a point of view of, firstly whether it is actually
possible to record everything. You could then potentially improve things
by being a little selective about which channels you record.

Lest say perhaps about 10Tb may be enough for most people.

Not just disk space, but if you are going to record each channel, then
you will need a large number of tuners, i.e. 1 per channel.
With the right h/w and s/w it may be possible to capture and dump the
whole MUX in one stream, and then demux it later. Don't know if such a
thing is easily/commercially available to ordinary folk.

Ben wrote:


Not just disk space, but if you are going to record each channel, then
you will need a large number of tuners, i.e. 1 per channel.

I don't think so. I reckon one tuner per multiplex. That's 6 tuners.

With the right h/w and s/w it may be possible to capture and dump the
whole MUX in one stream, and then demux it later.

More or less the way I was thinking. I'm not certain whether the average
computer chip would be able to decode all the multiplex streams and
store all the the individual channels, in real time.

If not then the system could simply dump all the data from all the
multiplexes to the hard drive, and then programs could be demultiplexed
when the user wants to watch them. But obviously this approach would
require more disk space. It may be a better aproach to get a processor
powerful enough to decode everything in real time.


Don't know if such a
thing is easily/commercially available to ordinary folk.

Neither do I. But as computer hardware gets more powerful, if it's not
possible yet, it might not be too many more years before it is.

Richard E.

Geoff Pearson wrote:


I'm amazed if I find more than one or two hours a week of interesting TV
- regardless of channel.

I personally find there is quite a lot of good stuff being broadcast,
but not necessarily at times when I'm able to watch it. Hence I find a
PVR to be very useful. If I had a system that kept everything broadcast
for a week, then I'm sure I could find plenty of good programs to watch.

In fact recording everything for just one day would be a good start.

Richard E.

Geoff Pearson wrote:


I'm amazed if I find more than one or two hours a week of interesting TV
- regardless of channel.

I'm watching Bugsey Malone right now, great fun. :-)

In article , Richard Evans
wrote:
Ben wrote:


With the right h/w and s/w it may be possible to capture and dump the
whole MUX in one stream, and then demux it later.

More or less the way I was thinking. I'm not certain whether the average
computer chip would be able to decode all the multiplex streams and
store all the the individual channels, in real time.

I'm not sure as I've never looking into this. But my recollection is that
it is possible to use a Linux system and one of the DVB-T receivers that
plugs into a computer to record and entire MUX with fully decoding it. If
so I guess you can then extact what 'stations' you want from the MUX
file(s) at a later stage.

JGM may perhaps know better/more about this.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
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Audio Misc http://www.audiomisc.co.uk/index.html

On Sun, 09 Jan 2011 13:48:32 +0000 (GMT), Jim Lesurf
wrote:

In article , Richard Evans
wrote:
Ben wrote:


With the right h/w and s/w it may be possible to capture and dump the
whole MUX in one stream, and then demux it later.

More or less the way I was thinking. I'm not certain whether the average
computer chip would be able to decode all the multiplex streams and
store all the the individual channels, in real time.

I'm not sure as I've never looking into this. But my recollection is that
it is possible to use a Linux system and one of the DVB-T receivers that
plugs into a computer to record and entire MUX with fully decoding it. If
so I guess you can then extact what 'stations' you want from the MUX
file(s) at a later stage.

The Nebula DVB-T card and USB tuners using their DigiTV software could
record either a chosen "station" or the whole of a mux stream. Demuxing
could be done later. That was 5 years ago. I assume that today's
versions could still do the same.

JGM may perhaps know better/more about this.

Slainte,

Jim

--
Peter Duncanson
(in uk.tech.digital-tv)

On Sunday, January 9th, 2011 at 13:48:32h +0000, Jim Lesurf pondered:

But my recollection is that it is possible to use a Linux system
and one of the DVB-T receivers that plugs into a computer to record
and entire MUX with fully decoding it.

If you have enough PCI slots, you could put in three dual tuner cards

To avoid disk contention it would help to have six separate disks for
recording each multiplex, plus one system disk.

If so I guess you can then extact what 'stations' you want from the
MUX file(s) at a later stage.

JGM may perhaps know better/more about this.

Not off the top of my head, but at least having an idea as to what I
need to search.

Turns out it is amazingly simple.

First tune the DVB receiver to the appropriate frequency for the
desired multiplex using szap for satellite card or tzap for terrestrial card.

From http://linuxtv.ORG/wiki/index.php/Multiple_programs

QUOTE

Record all PIDs of the tuned frequency

dvbstream can record the whole broadcast TS at the tuned frequency by
using the pseudo-PID 8192:

dvbstream 8192 -o all.mpeg

UNQUOTE

*or* use DVBstreamer to capture only the stations on the multiplex you
want to record.

Then at a later time use mplayer or tsreader or maybe vlc or yet other
alternatives to play the particular station (PID) from the recorded stream.