dvbnet error

dvbnet error

[Ondrej Topolsky]

Dear linuxtv developer-s

I am trying (it is now couple of days - of no avail) to create interface 
with dvbnet utility for decoding IP with MPE (tested with DVB-H signal 
containing IP packets). I run:
dvbnet -a 0 -p 1002
gives me this output:
Error: couldn't open device 0: 2 No such file or directory
But the char device /dev/dvb/adapter0/net0 is definitely there (in it's 
default location).
For some reason dvbnet_open function in dvb-apps/lib/libdvbapi/dvbnet.c 
cannot open this device
I have search mailing(and intenet) list but I haven't found any issue 
similar to this.

Specs:

I have embedded linux set-top Skytec JOBI box which has sh4 architecture 
and 2.6.32.28_stm24_0207 kernel. It is this device: 
http://www.satmultimedia.tv/skytec-hd-jobi
as Os i have installed enigma2 linux.

I thought that maybe there isn't kernel support for MPE, but why should 
there be net0 device which was created by driver..

My attempts:

After no success with debian  .deb packege of dvb-apps for sh4 
(installed with ipkg ),
I cross-compiled dvb-apps staticaly(from mercurial repository).
Eeverything works: szap, scan.. dvbsnoop. I can tune to signal, zap 
channels, sniff traffic with dvbtraffic, but dvbnet is giving me that 
"no such file.." error.

I have other machine which is running debian and is receiving same 
signal as is STB and I successfuly received IP from MPE (tested with 
tcpdump) on that other machine with no problem.

I noticed that in /sys/class/dvb/ there is no dvb0.net0 folder (but i am 
not exactly sure what is /sys/class/dvb folder used for).

Another wierd thing is that when I run dvbnet -h it segfaults and when I 
run /usr/bin/dvbnet -h it works (its definitely the same binary - with 
my debug messages).

Questions:
Can You please tell me why dvbnet cannot open this net0 device - or what 
should I do to find out?
Maybe it is used by some process, but i killed TV interface enigma2 
before trying anything(init 3, init 4 - it is not longer displayed in ps).
And can You please tell me how to detect if my kernel/driver has MPE 
support (there is no /proc/kallsyms file on STB) - maybe some C code.
Finaly I was trying to find some info about MPE but there seem to be 
very little on internet.
I would be grateful for any informations or links..

All the best

Ondrej Topolsky
Programmer at Maindata inc. Slovakia

Re: dvbnet error

[Antti Palosaari]

On 11/19/2012 05:48 PM, Ondrej Topolsky wrote:
> Dear linuxtv developer-s
>
> I am trying (it is now couple of days - of no avail) to create interface
> with dvbnet utility for decoding IP with MPE (tested with DVB-H signal
> containing IP packets). I run:
> dvbnet -a 0 -p 1002
> gives me this output:
> Error: couldn't open device 0: 2 No such file or directory

Device needs firmware but it is missing?

Try tzap or some other tool. Check from the system log if there is any 
errors.

> But the char device /dev/dvb/adapter0/net0 is definitely there (in it's
> default location).
> For some reason dvbnet_open function in dvb-apps/lib/libdvbapi/dvbnet.c
> cannot open this device
> I have search mailing(and intenet) list but I haven't found any issue
> similar to this.
>
> Specs:
>
> I have embedded linux set-top Skytec JOBI box which has sh4 architecture
> and 2.6.32.28_stm24_0207 kernel. It is this device:
> http://www.satmultimedia.tv/skytec-hd-jobi
> as Os i have installed enigma2 linux.
>
> I thought that maybe there isn't kernel support for MPE, but why should
> there be net0 device which was created by driver..
>
> My attempts:
>
> After no success with debian  .deb packege of dvb-apps for sh4
> (installed with ipkg ),
> I cross-compiled dvb-apps staticaly(from mercurial repository).
> Eeverything works: szap, scan.. dvbsnoop. I can tune to signal, zap
> channels, sniff traffic with dvbtraffic, but dvbnet is giving me that
> "no such file.." error.
>
> I have other machine which is running debian and is receiving same
> signal as is STB and I successfuly received IP from MPE (tested with
> tcpdump) on that other machine with no problem.
>
> I noticed that in /sys/class/dvb/ there is no dvb0.net0 folder (but i am
> not exactly sure what is /sys/class/dvb folder used for).
>
> Another wierd thing is that when I run dvbnet -h it segfaults and when I
> run /usr/bin/dvbnet -h it works (its definitely the same binary - with
> my debug messages).
>
> Questions:
> Can You please tell me why dvbnet cannot open this net0 device - or what
> should I do to find out?
> Maybe it is used by some process, but i killed TV interface enigma2
> before trying anything(init 3, init 4 - it is not longer displayed in ps).
> And can You please tell me how to detect if my kernel/driver has MPE
> support (there is no /proc/kallsyms file on STB) - maybe some C code.
> Finaly I was trying to find some info about MPE but there seem to be
> very little on internet.
> I would be grateful for any informations or links..
>
> All the best
>
> Ondrej Topolsky
> Programmer at Maindata inc. Slovakia
>

Antti

-- 
http://palosaari.fi/