[linux-dvb] Re: IP over dvb encapsulation

[Johannes Stezenbach <js@convergence.de>]

cwtan wrote:
> Hi,
> 
> cwtan wrote:
> > >
> > >I has read through the mailing list and come across a few similiar
> > >setup. Nonetheless, none of the got replied. I hope some one could
> > >help me up.
> > >L-band monitoring output will constantly output at 1080mhz. I tried to
> > >use scan program to scan at 1080Mhz but did not receive anything. Can
> > >anyone tell me what setting to use? DVB-C or DVB-S. If its DVB-s what
> > >about the polarization and other value since I am not using a real
> > >dish for frontend?
> > >I have been trying with ./scan -c 1080000000 but not successful also.
> 
> scan and szap assume you have an LNB and thus substract the
> LOF (local oscillator frequency).
> 
> You could add a "direct" LNB to lib/lnb.c which has a LOF of 0,
> and use 'szap -l direct'.
> 
> If you have just one frequency you should use szap to tune
> (create a one-line channels.conf with the proper frequency
> and some dummy values) and run 'scan -c'.
> 
> The szap works, but scan -c gives me some warning message (see below). I am
> not quite sure what should be the normal output since I am writing the
> encapsulator.(I need to verify if its my code problem or the setting
> problem)
> 
> Besides, is there any program that is low level enough that enable me to
> examine what TS frame that I am receiving? dvbtraffic doesn't gives me any
> output.
> 

Grr, your quoting really sucks. It is totally unclear who wrote what.

On the Linux kernel mailing list someone recommended:

OE-QuoteFix:
http://home.in.tum.de/~jain/software/oe-quotefix/

Outlook-QuoteFix:
http://flash.to/outlook-quotefix/

> status 1f | signal ffff | snr ffff | ber 0000ff00 | unc 00000000 | FE_HAS_LOCK

This looks good.

> ./scan -c
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> WARNING: filter timeout pid 0x0011
> WARNING: filter timeout pid 0x0000

Well, all that "scan" does is looking for PSI/SI (program specific
information/service information) as specified in the MPEG2 standard
(iso-13818-1) and the DVB-SI standard (ETSI EN-300-468). It looks
like your stream does not contain this information.

If you already know the PID of your MPE packets you can
setup the dvb-net interface without using scan.

Johannes


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