Decoding audio stream? - Techwatch Support Forums: Digital & Satellite TV, FTA, Cable, Computers, Mobile Phones, Apple and General Tech Forums

Unknown user #1 · 07-10-07, 12:23 PM

I recorded .TS file on my TM9100 from some scrambled channel, which was descrambled by the receiver.
It got 2 audio tracks - English and Polish. As I recorded in English mode, only the English sound was descrambled and therefore playable on PC. On TM9100 itself I can select whatever sound I want and works with CAM.

So, the TS got three streams:

1. Video (descrambled)
2. Audio - English (descrambled)
3. Audio - Polish (scrambled, marked as Private in packet headers).

The question is - assuming I still got the keys used for descrambling the channel - how can I descramble Polish soundtrack on my PC?

nanochickin · 07-10-07, 05:22 PM

Use VLC (Videolan) and you can select the audio track. It works with my Dreambox so i can't see it being that much diferent on the TM9100

Nano

RocketMBA · 07-10-07, 05:24 PM

I think you can open TS files in ProgDVB or DVBDream... I'm sure they will then get processed in the same way a stream from a card would, including plugins. Give it a try

Unknown user #1 · 07-10-07, 08:09 PM

Quote:

Originally Posted by nanochickin

Use VLC (Videolan) and you can select the audio track. It works with my Dreambox so i can't see it being that much diferent on the TM9100

Nano

Well.. the problem was that VLC produced silent stream, so I started my investigation to see what is happening.
I managed to demux it with ProjectX (a brilliant piece of kit and freeware too) and besides of MPEG headers, the stream was empty (0xFF). So it is not encrypted stream but rather bug on TM9100 side.

BGonaSTICK · 07-10-07, 09:37 PM

That sounds about right. The whole stream should be decrypted prior to it's committal to the disk, and no encrypted data should remain as far as I'm aware.

When I record anything which has been decrypted on the Dreambox, I can play it back from the disk and switch audio streams with no problem.

Unknown user #1 · 07-10-07, 11:51 PM

It seems that this bug was fixed in UR10B4 but I can't use this software due to stability issues.

07-10-07, 12:23 PM	#1 (permalink)
Unknown user #1 Senior Member Join Date: Jan 2007 Posts: 536 Thanks: 0 Thanked 0 Times in 0 Posts	Decoding audio stream? I recorded .TS file on my TM9100 from some scrambled channel, which was descrambled by the receiver. It got 2 audio tracks - English and Polish. As I recorded in English mode, only the English sound was descrambled and therefore playable on PC. On TM9100 itself I can select whatever sound I want and works with CAM. So, the TS got three streams: 1. Video (descrambled) 2. Audio - English (descrambled) 3. Audio - Polish (scrambled, marked as Private in packet headers). The question is - assuming I still got the keys used for descrambling the channel - how can I descramble Polish soundtrack on my PC?

07-10-07, 05:22 PM	#2 (permalink)
nanochickin Retired Mod & Sat Guru Join Date: Aug 2006 Location: Wolverhampton Posts: 3,825 Thanks: 46 Thanked 338 Times in 270 Posts	Re: Decoding audio stream? Use VLC (Videolan) and you can select the audio track. It works with my Dreambox so i can't see it being that much diferent on the TM9100 Nano __________________ Sanity is nothing more than an excuse to be boring

07-10-07, 05:24 PM	#3 (permalink)
RocketMBA As fun as having the flu Join Date: Jun 2007 Location: A cardboard box Posts: 626 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Decoding audio stream? I think you can open TS files in ProgDVB or DVBDream... I'm sure they will then get processed in the same way a stream from a card would, including plugins. Give it a try

07-10-07, 09:37 PM	#5 (permalink)
BGonaSTICK Dodgy Geezer Join Date: Nov 2005 Location: Brighton Posts: 9,718 Thanks: 3 Thanked 166 Times in 60 Posts	Re: Decoding audio stream? That sounds about right. The whole stream should be decrypted prior to it's committal to the disk, and no encrypted data should remain as far as I'm aware. When I record anything which has been decrypted on the Dreambox, I can play it back from the disk and switch audio streams with no problem. __________________ Dreambox 7000, Skystar2 PCI, Skystar USB, Fibo 90cm on Moteck SG2100, Triax TD110 multi-LNB. Sky + ART cards. 45.0°E - 58.0°W

07-10-07, 11:51 PM	#6 (permalink)
Unknown user #1 Senior Member Join Date: Jan 2007 Posts: 536 Thanks: 0 Thanked 0 Times in 0 Posts	Re: Decoding audio stream? It seems that this bug was fixed in UR10B4 but I can't use this software due to stability issues.