[linux-dvb] Re: IP over dvb encapsulation

["cwtan" <cwtan@nrg.cs.usm.my>]

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.

----------------------------------------------------------
channels.conf
-----------------
Mine:1080:v:0:6000:512:2000:1:99999
-------------------------------------------------------------

./szap -l DIRECT Mine
reading channels from file '/root/.szap/channels.conf'
zapping to 1 'Mine':
sat 0, frequency = 1080 MHz V, symbolrate 6000000, vpid = 0x0200, apid =
0x07d0
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
status 1f | signal ffff | snr ffff | ber 0000ff00 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal ffff | snr ffff | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal ffff | snr ffff | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal ffff | snr ffff | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal ffff | snr ffff | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal ffff | snr ffff | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal ffff | snr ffff | ber 00000000 | unc 00000000 |
FE_HAS_LOCK

----------------------------------------------------------------------------
--------------
./scan -c
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
WARNING: filter timeout pid 0x0011
WARNING: filter timeout pid 0x0000
dumping lists (0 services)
----------------------------------------------------------------------------
-----------

Thanks..

CW

Or you can create a one-line initial file for scan and run
'scan -l direct', but this will have problems if you have
and invalid NIT in your stream.

Or you can use one of the predefined LNBs and add the LOF to
your 1080MHz.

> >Another question is that whether the current 1.1.0 driver support MPE
> >decapsulation. (I understand that 0.8 version doesn't..)

Yes. See dvb-apps/util/dvbnet/.

Johannes


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