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Forums › Freeview (DVB-T/DVB-S) › Criminal Minds (TVOne) the other night had two AAC audio streams


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Topic # 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.




System One: Popcorn Hour A200,  PS3 SuperSlim, NPVR and Plex Server running on Gigabyte Brix (Windows 10 Pro), Sony BDP-S390 BD player, Pioneer AVR, Raspberry Pi running Kodi and Plex, Panasonic 60" 3D plasma, Google Chromecast

System Two: Popcorn Hour A200 ,  Oppo BDP-80 BluRay Player with hardware mode to be region free, Vivitek HD1080P 1080P DLP projector with 100" screen. Harman Kardon HK AVR 254 7.1 receiver, Samsung 4K player, Google Chromecast

 


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  Reply # 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.

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  Reply # 505911 13-Aug-2011 09:35
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Here's a few more details of how it works http://dannews.co.nz/2011/02/28/tvnz-to-launch-service-for-vision-impaired-and-blind-audiences/




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  Reply # 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.




System One: Popcorn Hour A200,  PS3 SuperSlim, NPVR and Plex Server running on Gigabyte Brix (Windows 10 Pro), Sony BDP-S390 BD player, Pioneer AVR, Raspberry Pi running Kodi and Plex, Panasonic 60" 3D plasma, Google Chromecast

System Two: Popcorn Hour A200 ,  Oppo BDP-80 BluRay Player with hardware mode to be region free, Vivitek HD1080P 1080P DLP projector with 100" screen. Harman Kardon HK AVR 254 7.1 receiver, Samsung 4K player, Google Chromecast

 


My Google+ page 

 

 

 

https://plus.google.com/+laurencechiu

 

 

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