PGCEdit request..thanks

[jamos]

Can you add dolby digital ex 7 channel to the list of audio surround modes in your next version?

thanks

[bigotti5]

There is not any info about Dolby Digital EX in any Ifo.
Only the number of discret encoded channels is stored in the Ifo.

[frank]

In other words:
They don't really exist as track. The EX channels are calculated from the 5 existing tracks!

You can set the multichannel extension to present.

[jamos]

interesting on my display on playback of the original dvd it says dolby digital ex in the dvd player software..after I strip the vobs of some unecessary subtitles and audio streams it now says dolby digital 5.1. I will check but I thought I did have multichannel extension to present..but that could be it.

thanks

[frank]

Then compare the original IFO content. What does VTSI_MAT say in audio attributes?
You can change it hex to the original values.

If it doesn't work then the stripping process changed some information in the audio stream. :confused:

[jamos]

Then compare the original IFO content. What does VTSI_MAT say in audio attributes?
You can change it hex to the original values.

If it doesn't work then the stripping process changed some information in the audio stream. :confused:
The hex values were different from the original. i hex edited them in ifoedit and even then it still does say 5.1 (actually multichannel extension is off in the original too). I think its a bug in Powerdvd because now even powerdvd with information on, playing the original dvd is saying dolby 5.1. I did remember it saying ex once though...maybe I am just going crazy!:scared:

[mpucoder]

The "multichannel extension present" flag in the ifo is for karaoke titles only, and, if set, there must be multichannel extension data in the ifo describing the karaoke channel assignments (guide melody, sound effects, guide vocal).
Many players, especially those with only 6 discrete audio output jacks, do not recognize DD ex, and ignore the extra channels.
But if authored correctly the audio attributes in the ifo will say there are 8 channels, not 6.

[r0lZ]

Thanks, mpucoder!

[jamos]

The "multichannel extension present" flag in the ifo is for karaoke titles only, and, if set, there must be multichannel extension data in the ifo describing the karaoke channel assignments (guide melody, sound effects, guide vocal).
Many players, especially those with only 6 discrete audio output jacks, do not recognize DD ex, and ignore the extra channels.
But if authored correctly the audio attributes in the ifo will say there are 8 channels, not 6.
Thanks for the info coder..

I think it is because it is 5.1 ex not true dolby digital ex.

[mpucoder]

I just had a look at A/52B (the ATSC designation for Dolby Digital specification) to get this clear in my head again. Back at A/52A the bsid (bit stream identification) of 6 was introduced, which is a backwards compatible modification to add matrixed rear surround. This is what has been called Dolby Digital EX for some time, and can be used in DVD. Technically there are still only 6 channels, the other 2 are derived via a matrix, and the only changes to the bitstream is indicators of the presence and mix levels of the extra channels.
A/52B adds, among other things, a new bsid of 16, and is not backwards compatible with the original (bsid of 8). Nor is it usable with DVD since the decoders are only required to decode the original specification.
One way to determine if it is EX is to look at the 6th byte of the stream, a value of 0x30 to 0x37 means bsid is 6, and indicates what is now called the "alternate bitstream syntax" which supports the matrixed channels. A value of 0x40 to 0x47 is the old bsid of 8, and has no extra channels. A value of 0x80 to 0x87 would be the new bsid of 16, "enhanced AC-3 bitstream syntax".

edit: I just noticed that VobEdit decodes the bsid for you, so you can check the original that way.
edit2: Another correction to make, Dolby Digital EX has 7 channels (6.1) not 8 (7.1)

[jamos]

I just had a look at A/52B (the ATSC designation for Dolby Digital specification) to get this clear in my head again. Back at A/52A the bsid (bit stream identification) of 6 was introduced, which is a backwards compatible modification to add matrixed rear surround. This is what has been called Dolby Digital EX for some time, and can be used in DVD. Technically there are still only 6 channels, the other 2 are derived via a matrix, and the only changes to the bitstream is indicators of the presence and mix levels of the extra channels.
A/52B adds, among other things, a new bsid of 16, and is not backwards compatible with the original (bsid of 8). Nor is it usable with DVD since the decoders are only required to decode the original specification.
One way to determine if it is EX is to look at the 6th byte of the stream, a value of 0x30 to 0x37 means bsid is 6, and indicates what is now called the "alternate bitstream syntax" which supports the matrixed channels. A value of 0x40 to 0x47 is the old bsid of 8, and has no extra channels. A value of 0x80 to 0x87 would be the new bsid of 16, "enhanced AC-3 bitstream syntax".

edit: I just noticed that VobEdit decodes the bsid for you, so you can check the original that way.
edit2: Another correction to make, Dolby Digital EX has 7 channels (6.1) not 8 (7.1)

where would I look for this in ifo edit? this is what I am looking at the original stream..

[jamos]

I just had a look at A/52B (the ATSC designation for Dolby Digital specification) to get this clear in my head again. Back at A/52A the bsid (bit stream identification) of 6 was introduced, which is a backwards compatible modification to add matrixed rear surround. This is what has been called Dolby Digital EX for some time, and can be used in DVD. Technically there are still only 6 channels, the other 2 are derived via a matrix, and the only changes to the bitstream is indicators of the presence and mix levels of the extra channels.
A/52B adds, among other things, a new bsid of 16, and is not backwards compatible with the original (bsid of 8). Nor is it usable with DVD since the decoders are only required to decode the original specification.
One way to determine if it is EX is to look at the 6th byte of the stream, a value of 0x30 to 0x37 means bsid is 6, and indicates what is now called the "alternate bitstream syntax" which supports the matrixed channels. A value of 0x40 to 0x47 is the old bsid of 8, and has no extra channels. A value of 0x80 to 0x87 would be the new bsid of 16, "enhanced AC-3 bitstream syntax".

edit: I just noticed that VobEdit decodes the bsid for you, so you can check the original that way.
edit2: Another correction to make, Dolby Digital EX has 7 channels (6.1) not 8 (7.1)
where do you look for this in vobedit? can you post a snippet of what it looks like?

thanks.

[jamos]

Ok could finally reproduce this issue and it has nothing to do with pgcedit.

It seems if i double click on a original vob decrypted with decrypter my dvd player software powerdvd knows that the vob is dolby digital ex (it says it on the info display). But, if I use shrink or recode to reauthor and then double click on the reauthored vob file it has no audio when playing the vob with powerdvd. Very strange, there is something in the original vob file that is telling the powerdvd that it is a dolby digital ex sound that is not in the reauthored vob. :confused:

Not that all this matters much as when I play the dvd (even the original) from the menu it says dolby digital 5.1 when playing (but will put out the ex signal so my receiver picks it up when I connect it to my doby ex reciever and uses ex).

Joining cells with vob edit still keeps the ex display when playing the vobs directly with powerdvd.

[setarip_old]

@jamos

I have no insight to offer, only a question:

When you re-author in DVD Shrink, does it list "Dolby Digital EX" as one of the audiostreams?

[jamos]

@jamos

I have no insight to offer, only a question:

When you re-author in DVD Shrink, does it list "Dolby Digital EX" as one of the audiostreams?
No, Shrink does not show EX as a stream shows dolby digital (so does recode) as it really is just a mix of dolby digital 5.1 that some recievers or software players can decode.

But, as I said when I play the whole dvd even from the original dvd the software says dolby 5.1 so I would say it is a bug in the player software more than a issue with pgcedit or some other editing software.

It is strange though when you use shrink to strip things that it does take out the default audio from the vobs, without rebuilding the ifos and playing the full title you will get no audio playing back a vob by itself after shrink or recode strips it.