AC3 tests on TVOne DTT

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openmedia

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#19513 19-Feb-2008 22:52

Just noticed that TVOne is currently advertising an AC-3 bitstream in addition to their AAC stream. It appears to be a full 5.1 matrix. Anyone else able to check this. Sadly the news in 5.1 isn't exactly exciting.

Steve

Generally known online as OpenMedia, now working for Red Hat APAC as a Technology Evangelist and Portfolio Architect. Still playing with MythTV and digital media on the side.

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#111730 19-Feb-2008 23:10

Any idea if this will be permanent? Even if its stereo will there still be an AC3 stream (i assume so)? This could solve codec issues if so.

mentalinc

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#111734 19-Feb-2008 23:18

yes i can see this stream as well. tudors could be slightly more entertaining than the news

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#111755 20-Feb-2008 01:10

eXDee: Any idea if this will be permanent? Even if its stereo will there still be an AC3 stream (i assume so)? This could solve codec issues if so.

Nothing is permanent until closer to the go live.

It is also possible to just turn on AC3 as and when they need it, which I seriously hope they don't decide to implement.

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sbiddle

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#111768 20-Feb-2008 08:04

It would be great if they could upscale all audio to Dolby Pro Logic II before transmitting an AC3 stream!

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#111836 20-Feb-2008 12:43

sbiddle: It would be great if they could upscale all audio to Dolby Pro Logic II before transmitting an AC3 stream!

I would be satisfied with just getting it and not playing the waiting game.
I'm saving hard to get my computer a decoder, not sure what to get, Sat or terra's.

openmedia

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#111897 20-Feb-2008 17:27

Well they have now turned off the AC3 stream, so back to stereo HE-AAC

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#112030 21-Feb-2008 10:37

Well as of this morning I'm seeing AC3 audion on TV One and TV 2. They have changed all of the A/V pids as well so everyone will probably need to re-scan the channels to see anything

Before

TV ONE                   (0x04b0) 19:            V 0x00fa A 0x012c (eng) TT 0x03f2 AC3 0x0020 SUB 0x03fc
TV2                      (0x04b1) 19:            V 0x00fb A 0x012d (eng) TT 0x03f2 SUB 0x0401
TVNZ 6                   (0x04b2) 16:            V 0x00fc A 0x012e (eng) TT 0x03f2 SUB 0x0406
TVNZ 7                   (0x04b3) 16:            V 0x00fd A 0x012f (eng) TT 0x03f2 SUB 0x040b
TVNZ SPORT EXTRA         (0x04b4) 16:            V 0x00fe A 0x0130 (eng) TT 0x03f2 SUB 0x0410

After

TV ONE                   (0x04b0) 19:            V 0x010e A 0x0140 (eng) TT 0x03f2 AC3 0x01a5 SUB 0x042e
TV2                      (0x04b1) 19:            V 0x010f A 0x0141 (eng) TT 0x03f2 AC3 0x01a6 SUB 0x0433
TVNZ 6                   (0x04b2) 16:            V 0x0110 A 0x0142 (eng) TT 0x03f2 SUB 0x0438
TVNZ 7                   (0x04b3) 16:            V 0x0111 A 0x0143 (eng) TT 0x03f2 SUB 0x043d
TVNZ SPORT EXTRA         (0x04b4) 16:            V 0x0112 A 0x0144 (eng) TT 0x03f2 SUB 0x0442

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mentalinc

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#112043 21-Feb-2008 11:28

I Deleted my channels (without backup - stupid me) to try and see the changes as above.

Now i cant find anything

doing a scan finds 0 channels.

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openmedia

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#112055 21-Feb-2008 12:05

Still there but they just changed the pids again

TV ONE                   (0x04b0) 19:            V 0x00fa A 0x012c (eng) TT 0x03f2 AC3 0x0191 SUB 0x03fc
TV2                      (0x04b1) 19:            V 0x00fb A 0x012d (eng) TT 0x03f2 AC3 0x0192 SUB 0x0401
TVNZ 6                   (0x04b2) 16:            V 0x00fc A 0x012e (eng) TT 0x03f2 SUB 0x0406
TVNZ 7                   (0x04b3) 16:            V 0x00fd A 0x012f (eng) TT 0x03f2 SUB 0x040b
TVNZ SPORT EXTRA         (0x04b4) 16:            V 0x00fe A 0x0130 (eng) TT 0x03f2 SUB 0x0410

You might have done a scan while they were reloading things

Steve

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mentalinc

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#112062 21-Feb-2008 12:36

Ok has found them all this time.

Have they changed the frequencies?

I did a search with the settings shown in the ultimate guide - nothing found
then did a search with the frequencies that are tere by default and it found all 14 channels.

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#112109 21-Feb-2008 17:02

Well another change late this afternoon to only transmitting AC3 for TV One

TV ONE                   (0x04b0) 19:            V 0x00fa TT 0x03f2 AC3 0x0191 SUB 0x03fc
TV2                      (0x04b1) 19:            V 0x00fb A 0x012d (eng) TT 0x03f2 AC3 0x0192 SUB 0x0401
TVNZ 6                   (0x04b2) 16:            V 0x00fc A 0x012e (eng) TT 0x03f2 SUB 0x0406
TVNZ 7                   (0x04b3) 16:            V 0x00fd A 0x012f (eng) TT 0x03f2 SUB 0x040b
TVNZ SPORT EXTRA         (0x04b4) 16:            V 0x00fe A 0x0130 (eng) TT 0x03f2 SUB 0x0410

TV 2 still has AAC and AC3 streams

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openmedia

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#112118 21-Feb-2008 17:31

Oh the joys of testing. Back to AAC and AC3 on TV One, and no AC3 on TV 2

TV ONE                   (0x04b0) 19:            V 0x00fa A 0x012c (eng) TT 0x03f2 AC3 0x0191 SUB 0x03fc
TV2                      (0x04b1) 19:            V 0x00fb A 0x012d (eng) TT 0x03f2 SUB 0x0401
TVNZ 6                   (0x04b2) 16:            V 0x00fc A 0x012e (eng) TT 0x03f2 SUB 0x0406
TVNZ 7                   (0x04b3) 16:            V 0x00fd A 0x012f (eng) TT 0x03f2 SUB 0x040b
TVNZ SPORT EXTRA         (0x04b4) 16:            V 0x00fe A 0x0130 (eng) TT 0x03f2 SUB 0x0410

Also I dumped an AC3 stream off TV One for a look as follows

ATSC A/52 aka AC-3 aka Dolby Digital stream, 48 kHz,, complete main (CM) 3 front/2 rear, LFE on,, 224 kbit/s

So 5.1 encoded but ony 224 kbit/s

Steve

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#112147 21-Feb-2008 20:53

Here we go again. AC3 for TV 2 is back on.

Steve

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mentalinc

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#112184 21-Feb-2008 21:55

Guess they were playing around with it. But why did they have to do it during E.R?

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#112208 22-Feb-2008 00:13

mentalinc: Guess they were playing around with it. But why did they have to do it during E.R?

Because they can.. We have to remember that until the official launch this is all in test and they can play with it as much as they like.

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