Re: [linux-dvb] RFC - Flexcop Streaming watchdog (VDSB)

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Hi Barry,
Hi Walter,

On Sat, 17 Jan 2009, BOUWSMA Barry wrote:
For years there has been the Video Data Stream Borken-error with VDR and
Technisat cards: The error occured randomly and unfrequently. A

In fact it turned out, that the problem is worse with setups not based
on VDR and the "VDSB-error" could be really easily reproduced (I'm not
sure if this applies to all generations on SkyStar2-card). I'm

Which generation of cards have this problem? I did not see any VDSB with
my two Skystar 2.6D.

Same here -- never experienced this ever in some four-ish years
with one SkyStar2 of model long forgotten, with that card being
the primary one used whenever possible...

(in use typically several times per day, sometimes half a day
uninterrupted, but on a production machine at 2.6.14-ish)

Using VDR or a single application (like kaffeine), you most likely don't see the error anymore thanks to the work-around which is already in place. It is resetting the streaming interface at the end of a streaming-session, ie. when the pid-filter count is going from 1 to 0. This happens all the time with VDR (and similar) when it is retuning.

Now when you launch an application which is just requesting a pid and another one which is tuning independently, you can fall easily in this problem.

I have to say, that the user which showed me the problem was using the rev2.8 and due to the lack of time I couldn't check with other versions than this card yet.

But I think those kind of problems also exist for older cards.

Patrick.

PS: how to reproduce:

shell 1: $ tzap channel
shell 2: $ dvbtraffic
[lots of output that streaming is working]
shell 1: $ <C-c>
shell 1: $ tzap "channel2_which is on a different frequency"
shell 2: no output of dvbtraffic any longer... (problem)

--
  Mail: patrick.boettcher@xxxxxxx
  WWW:  http://www.wi-bw.tfh-wildau.de/~pboettch/
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