[linux-dvb] Confused Air2PC owner

Niklas Peinecke n.peinecke at web.de
Fri Feb 25 08:42:51 CET 2005


Hello Clemens,

let me first state, that I have no idea about ATSC, but I think I could 
give you some assistance.

clemens at dwf.com wrote:
[...]
> and I get
> 
>     [root at mythtv .azap]# more /root/.azap/channels.conf
>     KNME:599000000:8VSB:0:0
>     KASA:551000000:8VSB:0:0
>     KASY:659000000:8VSB:0:0
>     KWBQ:563000000:8VSB:0:0
>     KRQE:485000000:8VSB:0:0
>     KOAT:515000000:8VSB:0:0
>     KOB:545000000:8VSB:0:0
>     KLUZ:641000000:8VSB:0:0
>     KNAT:533000000:8VSB:0:0
>     KNMD:189000000:8VSB:0:0
>     KAZQ:491000000:8VSB:0:0
>     KCHF:195000000:8VSB:0:0
> 
> The channels found, and there frequencies are correct, but I dont
> know what the :8VSB:0:0 is trying to tell me.
> 
> Anyone?  Jump right in here...

Well, I think 8VSB is something technical for ATSC, but the two numbers 
should be the video and the audio PID (see below).

> 
> All of the stations broadcast from the top of Sandia Peak, about
> 5 miles away and 5000 ft higher than we are here in the city, so
> the signal strength is high for all of them.
> 
> Choosing just one at random, I see:
> 
>     [root at mythtv ~]# azap kob
>     using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
>     tuning to 545000000 Hz
>     video pid 0x0000, audio pid 0x0000
>     status 1f | signal fad0 | snr dbaa | ber 00007ff8 | unc 00000000 | 
> FE_HAS_LOCK
>     status 1f | signal fa60 | snr da90 | ber 000003e0 | unc 00000000 | 
> FE_HAS_LOCK
>     status 1f | signal fab0 | snr dcc4 | ber 00000898 | unc 00000000 | 
> FE_HAS_LOCK
>     status 1f | signal faf0 | snr dbaa | ber 00000860 | unc 00000000 | 
> FE_HAS_LOCK
>     status 1f | signal fab0 | snr d8ba | ber 000009b0 | unc 00000000 | 
> FE_HAS_LOCK
>     status 1f | signal fa20 | snr da32 | ber 000007e8 | unc 00000000 | 
> FE_HAS_LOCK
> 

This looks good.

[...]
> 
>     2005-02-24 17:49:27.975 DVB#0 AutoPID Complete - PAT/PMT Loaded for service
>     2005-02-24 17:49:27.975 DVB#0 Service is FTA
>     2005-02-24 17:49:27.975 DVB#0 ERROR - No PIDS set, please correct your 
> channel setup.
>     2005-02-24 17:49:28.988 DVB#0 WARNING - No data from card in 1 second.
> 
> No idea what AutoPID is trying to do, and I have no Idea what to do to respond 
> to
> 
>     ERROR - No PIDS set, please correct your channel setup.
> 
> on the third line.
> 
> ---
> 
> So what have I missed?
> Whats my next step?
> 
> I have seen the PID thing mentioned, but with no real example of what is needed
> to fix the problem.  This wasn't something I saw with the other cards and the
> other drivers...

PIDs are identification numbers that tell the software, where to expect 
audio and video data in the transport stream (a TS can contain many of 
them, so one needs to know, which to select). For some reason your 
initial scan set these two PIDs to 0 which is not correct. If you can 
find out the PID numbers from some other source (maybe windows or the 
net) you can enter them manually, then tuning should work.

However I have no idea, why scan might fail.

Good luck,

Niklas




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