[mythtv] what does "DVBRec(1): PID 0x840 discontinuity detected" mean?

[Steven Adeff]

On 9/30/06, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
> On 9/30/06, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
> > On 9/30/06, Stuart Auchterlonie <stuarta at squashedfrog.net> wrote:
> > > On Fri, Sep 29, 2006 at 07:19:02PM -0400, Steven Adeff wrote:
> > > > On 9/29/06, Stuart Auchterlonie <stuarta at squashedfrog.net> wrote:
> > > > >
> > > > > These are caused by the next packet being recieved on that pid,
> > > > > not being the one that is expected.
> > > > >
> > > > > The main cause is bad signal, but you've had that sorted.
> > > > > It can also caused by things like power spikes, or other
> > > > > intermittant interferance.
> > > > >
> > > > > However, looking at this i've noticed something interesting.
> > > > > We don't throw away the packet if we detect a discontinuity.
> > > > > This would be okay if the new packet CC = last seen CC, as this
> > > > > would possibly be a duplicate packet. But if the new packet CC
> > > > > is > last seen CC + 1 (modulo 0xf) then the full TS packet is
> > > > > broken and should be thrown away....
> > > > >
> > > > > I'll whip up a quick patch for that...
> > > >
> > > > thanks, let me know if I can provide any more information. I do know
> > > > that my HD3000 is more prone to this error than either of my Aver
> > > > A180's (which 95% of the time show the problem at the same time).
> > > >
> > >
> > > That is to be expected, since some form of electrical interference
> > > would hit the input and all cards equally. It looks like the HD3000
> > > is more sensitive to this noise..
> > >
> > > The patch has gone in in changeset 11334.
> >
> > Is it safe to apply the diff for 11334 to 0-20-fixes or will it need
> > other patches to work?
>
> well, I did that anyway, and it seems as though only my HD3000 card
> has issues (perhaps moving it to another pci slot?), as the A180's
> recorded together fine, and only showed any problems once the HD3000
> started recording.
>
> any way, let me know about how exactly I should test the patch (I'll
> guess I did it wrong) and I'll try that...

errors still show up but now they don't cause me to miss whole blocks
of seconds, just minor blips. which i guess is an improvement. I'd
still love to know why this started happening. I even replaced the
HD3000 with a new card and get the problem....

-- 
Steve
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