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lchiu7

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#88309 13-Aug-2011 08:55
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Captured this show the other night and when I playing it back I noticed there were two audio streams.
Audio #1
ID                               : 320 (0x140)
Menu ID                          : 1200 (0x4B0)
Format                           : AAC
Format/Info                      : Advanced Audio Codec
Format profile                   : HE-AAC / LC
Muxing mode                      : LATM
Codec ID                         : 17
Duration                         : 1h 2mn
Channel(s)                       : 2 channels
Channel positions                : Front: L R
Sampling rate                    : 48.0 KHz / 24.0 KHz
Compression mode                 : Lossy
Delay relative to video          : -416ms
Language                         : English

Audio #2
ID                               : 325 (0x145)
Menu ID                          : 1200 (0x4B0)
Format                           : AAC
Format/Info                      : Advanced Audio Codec
Format profile                   : HE-AAC / LC
Muxing mode                      : LATM
Codec ID                         : 17
Duration                         : 1h 2mn
Channel(s)                       : 2 channels
Channel positions                : Front: L R
Sampling rate                    : 48.0 KHz / 24.0 KHz
Compression mode                 : Lossy
Delay relative to video          : 156ms
Language                         : Italian

Both are AAC, have the same basic properties (they sound the same) but Mediainfo reports one as being Italian!  It wasn't. But interestingly they have different delays relative to the video.

Perhaps TVOne is preparing for their DD5.1 stream by sending out two audio streams to start with and eventually replacing one of the AAC streams with a DD5.1 once they get their workflow sorted out.





Staying in Wellington. Check out my AirBnB in the Wellington CBD.  https://www.airbnb.co.nz/h/wellycbd  PM me and mention GZ to get a 15% discount and no AirBnB charges.


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sbiddle
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  #505910 13-Aug-2011 09:33
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Dual AAC streams have been in place since the start of the year. There are a number of shows that use the Audio Description service, when this is not in use the 2nd AAC stream just carries the same audio as the first stream.



sbiddle
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lchiu7

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  #505935 13-Aug-2011 10:50
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It was news to me since I usually don't see two audio tracks from TVNZ. 

I just hope with the RWC so close that DD5.1 will be here soon.




Staying in Wellington. Check out my AirBnB in the Wellington CBD.  https://www.airbnb.co.nz/h/wellycbd  PM me and mention GZ to get a 15% discount and no AirBnB charges.


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