[linux-dvb] Re: dec2000-t success

[pdq808@t-online.de (Reiner Klenk)]

On Sun, 27 Apr 2003, Bruce Janson wrote:

> However, according to
> 
>   http://www.linux-usb.org/linux.conf.au.02/talk/html/slide_5.html
>   http://www.usb.org/faq/ans2#q1
> 
> the DEC 2000-t's USB 1.1 interface will impose a 12 Mbits/s limit on
> its USB->PC interface.  I do not know the maximum (compressed)
> throughput that can be required by a 7 MHz, DVB-T transport stream
> (23 Mbits/s?), but I suspect that it does exceed 12 Mbits/s.
> If true, this would impose an unfortunate limitation on the DEC 2000-t.
> (USB 2.x at 480 Mbits/s would have avoided this...)

Yeah, I am a little confused here, too. I just tuned to one of the
stations and mplayer tells me the video stream is:

 MPEG2 720x576 (aspect 2)  25,00 fps 18750,0 kbps (2343,8 kbyte/s)

plus the audio stream:

Layer: 2  BRate: 192 kb/s  Freq: 48.0 kHz

That would exceed the USB 1.1 data rate. Does this mean that the transport 
stream adds another level of compression ?

Anyone knows whether the dec2000 can also handle ac3 audio streams ? If 
so, how can I extract them from the transport stream ?

Regards,
Reiner




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