[dvblast-devel] warning: invalid SDT received

[Ludovic BOUE]

Hi Nuno, 

I had the same issue few month ago as you can see: 

De: "Georgi Chorbadzhiyski" <gf at unixsol.org> 
À: "Ludovic BOUÉ" <ludovic.boue at gmail.com> 
Envoyé: Mercredi 2 Mai 2012 11:38:41 
Objet: Re: [biTStream] Issue invalid_sdt_section 

Around 04/26/2012 10:23 AM, Ludovic BOUÉ scribbled: 
> Le 25/04/2012 16:55, Ludovic BOUÉ a écrit : 
>> Hello, 
>> 
>> I am facing an issue to print SDT table with dvb_print_si tool. I am 
>> analysing a RTP mutlicast stream: 
>> 
>> # dumprtp 239.255.2.32 1234| ts_filter 17| ./dvb_print_si -x xml -T SDT 
>> <?xml version="1.0" encoding="utf-8"?> 
>> <TS> 
>> Filtering pid 17 
>> Rtp dump 
>> Using 239.255.2.32:1234 
>> <ERROR type="invalid_sdt_section" pid="17"/> 
>> <ERROR type="invalid_sdt_section" pid="17"/> 
>> <ERROR type="invalid_sdt_section" pid="17"/> 
>> <ERROR type="invalid_sdt_section" pid="17"/> 
>> <ERROR type="invalid_sdt_section" pid="17"/> 
>> 
>> It's working fine for other sections like EIT 
>> # dumprtp 239.255.2.32 1234| ts_filter 18| ./dvb_print_si -x xml -T EIT 
>> Rtp dump 
>> Using 239.255.2.32:1234 
>> Filtering pid 18 
>> <?xml version="1.0" encoding="utf-8"?> 
>> <TS> 
>> <EIT tableid="0x50" type="actual_schedule" service_id="769" 
>> version="3" current_next="1" tsid="3" onid="8442" 
>> seg_last_sec_number="144" last_table_id= 
>> "0x50"> 
>> <EVENT id="6453" start_time="1335507900" start_time_dec="2012-04-27 
>> 06:25:00 UTC" duration="300" duration_dec="00:05:00" 
>> running_status="0" free_CA_mo 
>> de="1"> 
>> <DESC id="0x4d" length="164" 
>> value="6672651505532e412e562e2064657320e96d697373696f6e738a055072e973656e74e920706172204f6d617220657420467265642e20556e20 
>> 736b657463682064274f6d617220657420467265642064616e73206c657175656c206c652064756f20e97472696c6c652c206176656320756e2068756d6f757220636f72726f7369662c20 
>> 6c65207065746974206d6f6e6465206465206c612074e96ce9766973696f6e2e"> 
>> <SHORT_EVENT_DESC lang="fre" event_name="S.A.V. des émissions" 
>> text="Présenté par Omar et Fred. Un sketch d'Omar et Fred dans 
>> lequel le duo étril 
>> le, avec un humour corrosif, le petit monde de la télévision."/> 
>> </DESC> 
>> </EVENT> 
>> 
>> What would you recommend to debug and fix that? 
>> 
>> Regards, 
>> Ludovic BOUÉ 
> 
> Hi Georgi, 
> 
> I save a little bit of the stream and run dvb_print_si but I get similar 
> errors. You can find the dump here http://resel.fr/~lboue/canalplus.dump 
> Could you look at it you a TS analyzer? 
> 
> # cat canalplus.dump| ./dvb_print_si -x xml |grep invalid_sdt_section 
> <ERROR type="invalid_sdt_section" pid="17"/> 
> <ERROR type="invalid_sdt_section" pid="17"/> 
> <ERROR type="invalid_sdt_section" pid="17"/> 

As expected the incoming SDT is buggy. See the attachment. 

-- 
Georgi Chorbadzhiyski 
http://georgi.unixsol.org/ 
----- Mail original ----- 

De: "Nuno Mota" <ambershaper at gmail.com> 
À: dvblast-devel at videolan.org 
Envoyé: Mercredi 7 Novembre 2012 14:08:34 
Objet: [dvblast-devel] warning: invalid SDT received 

Hi, 

Found this while tuning Astra 19.2°E - 12603.75 H. 

Works fine using Mumudvb. 

debug: setting filter on PID 0 
debug: setting filter on PID 16 
debug: setting filter on PID 17 
debug: setting filter on PID 18 
debug: setting filter on PID 19 
debug: setting filter on PID 20 
debug: frontend has acquired signal 
debug: frontend has acquired carrier 
debug: frontend has acquired stable FEC 
debug: frontend has acquired sync 
info: frontend has acquired lock 
debug: - Bit error rate: 67108608 
debug: - Signal strength: 67074343 
debug: - SNR: 67108863 
debug: new PAT tsid=1111 version=14 
debug: * NIT pid=16 
debug: * program number=13 pid=32 
debug: * program number=7201 pid=7201 
debug: * program number=7203 pid=7203 
debug: * program number=7212 pid=7212 
debug: * program number=7216 pid=7216 
.... 
debug: * program number=28547 pid=5630 
debug: end PAT 
warning: invalid SDT received 

I'm not much familiar with this but I guess this has something to do with biTStream parsing. 

Best regards, 
Nuno 

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