[linux-dvb] typhoon usb dvb-t card low signal

Bertrand Marquis bertrand.marquis at gmail.com
Sun Mar 5 15:56:01 CET 2006


hi again,

I have gone a little bit deeper using an usb sniffer under windows to be able 
to compare what is done by the linux and the windows driver.

It seems that the pid filters set by windows are a little bit different which 
can result in less transfert under windows.
So here are the packets i have under windows:
- 05 : reset pid table
- 04 00 00 00
- 04 01 12 00
- 04 02 e0 00
- 04 03 e1 00
- 04 04 e2 00
- 04 06 e7 00

and under linux:
- 04 00 31 01
- 04 01 32 01
- 04 02 00 00
and there is no reset of the pid table.

Can someone explain if this can be the reason and how can i solve this ?

Bertrand

Le Samedi 4 Mars 2006 12:08, Bertrand Marquis a écrit :
> Hi everyone,
>
> I'm still trying to make my  typhoon dvb-t usb box card work and i was
> wondering if that could help:
>
> The output of dvbtraffic with tzap running in one channel is:
> [bma at localhost ~]$ dvbtraffic
> 0000     3 p/s     0 kb/s     4 kbit
> 0131  1400 p/s   257 kb/s  2105 kbit
> 0132   103 p/s    18 kb/s   155 kbit
> 2000  1507 p/s   276 kb/s  2266 kbit
> -PID--FREQ-----BANDWIDTH-BANDWIDTH-
>
> Shouldn't i have more entries ?
>
> The output of dvbsnoop is:
> [bma at localhost ProjectX_Source_0.90.3.01]$ dvbsnoop -s pidscan
> dvbsnoop V1.3.77 -- http://dvbsnoop.sourceforge.net/
>
> ---------------------------------------------------------
> Transponder PID-Scan...
> ---------------------------------------------------------
> PID found:    0 (0x0000)  [SECTION: Program Association Table (PAT)]
> PID found:    1 (0x0001)  [SECTION: Conditional Access Table (CAT)]
> PID found:   16 (0x0010)  [SECTION: Network Information Table (NIT) -
> actual network]
> PID found:   17 (0x0011)  [SECTION: Service Description Table (SDT) -
> actual transport stream]
> PID found:   18 (0x0012)  [SECTION: Event Information Table (EIT) - actual
> transport stream, schedule]
> PID found:   20 (0x0014)  [SECTION: Time Date Table (TDT)]
> PID found:   21 (0x0015)  [SECTION: ITU-T Rec. H.222.0|ISO/IEC13818
> reserved] PID found:   48 (0x0030)  [SECTION: DSM-CC - Download Data
> Messages (DDB)] PID found:  161 (0x00a1)  [PES: ITU-T Rec. H.262 | ISO/IEC
> 13818-2 or ISO/IEC 11172-2 video stream]
> PID found:  162 (0x00a2)  [PES: ISO/IEC 13818-3 or ISO/IEC 11172-3 audio
> stream]
> PID found:  167 (0x00a7)  [PES: private_stream_1]
> PID found:  225 (0x00e1)
> PID found:  231 (0x00e7)
>
> An other wird point is that when i try to run tzap and then open mplayer or
> xine using /dev/dvb/adaptor0/dvr0 they hang waiting for data. In fact doing
> a cat on dvr0 or a dd to a file result in no data at all. Does anyone knows
> why?
>
> When i start mplayer or xine using dvb://channel coming from the
> configuration file than i have something at first and then the buffer
> become empty and i have nothing more. It seems that the data has a very
> slow rate and so at first the players are able to decode a part of images
> and sound but buffer became empty after a short time and then i have
> nothing more. Making the buffer a log bigger just allow to see part of the
> images and sound for a little bit more longer.
>
> Thanks in advance
>
> Bertrand
>
> Le Samedi 25 Février 2006 16:43, Bertrand Marquis a écrit :
> > Hi,
> >
> > i tried to increase/decrease the mplayer cache, but nothing change, only
> > i have a little bit more parts of the image until the cache became empty.
> >
> > When i put 50Mo of cache i have some parts of the image and the cache
> > decrease really fast, it seems that once mplayer is playing pratically
> > nothing comes out of the driver and then i have no image at all.
> >
> > Bertrand
> >
> >
> >
> >
> >
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