[linux-dvb] dvbstream: Not able to lock to the signal

Hong Yin Lim hongyin.lim at gmail.com
Thu Nov 22 12:31:04 CET 2007


I'm trying to capture 1 whole Transport Stream (TS) from my card.
These are the output from my dvbstream command:

[root at dvstation dvbstream]# ./dvbstream -f 554000 -s 6875 -qam 256 -n 30
8192 > test.ts

dvbstream v0.7 - (C) Dave Chapman 2001-2004
Released under the GPL.
Latest version available from http://www.linuxstb.org/
Tuning to 554000 Hz
Using DVB card "ST STV0297 DVB-C", freq=554000
tuning DVB-C to 554000000, srate=6875000
Getting frontend status
Event:  Frequency: 554000000
        SymbolRate: 6874000
        FEC_inner:  0
Bit error rate: 0
Signal strength: 841
SNR: 6301
UNC: 0
dvbstream will stop after 30 seconds (0 minutes)
Output to stdout
Streaming 1 stream


However, when I try to play back the file via VLC, I received a lot of these
(these are just some of the messages):

ts warning: discontinuity received 0xf instead of 0xd (pid=33)
ts warning: discontinuity received 0x8 instead of 0x7 (pid=35)
ts warning: discontinuity received 0x5 instead of 0x2 (pid=34)

ts debug: pid[34] unknown

ts debug: transport_error_indicator set (pid=35)
ts debug: transport_error_indicator set (pid=34)

It seems that the TS that I capture from the card has a lot of Transport &
Continuity count error.

Also, when I analyse the Pids through dvbstream, I realise the Pids are
actually increasing when the Pids for the normal stream is fixed!
Basically, I run the -analyse command & print the output to a file
When I checked the number of Pids found, it was about 60+
5 seconds later, it increased to about 70+
and it keeps increasing...
However, all this numbers are wrong because I have previously confirmed that
the TS itself only has 55 Pids!
Is the dvbstream somehow adding the Pids?

Have anyone experience this problem before?
Or it there a solution to this.

Thank you very much.

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