[mythtv] Re: TS Timing issues

[William Uther]

On Wed, 16 Mar 2005 14:47:56 +0100, Jesper Sörensen 
<jesper at datapartner.se> wrote:

>> 2) So onto TS mode, while playing back the recording in myth and
>> pressing the 'i' key, the display says the recording is only ~30sec to
>> 2 mins (the time varies). However the file on the file system appears
>> to have a valid end time and size, suggesting that the recording
>> should be longer than the ~2mins that the osd claims it is. Playing
>> the same file in mplayer, and mplayer crashes at approx the ~30sec to
>> 2mins timeframe. This leads me to believe the recording is corrupt
>> (for some reason), rather than a playback issue.
>
> Peter, and all other DVB users out there:
>
> I think both of these issues are "known problems", but all the devs are
> busy people and as far as I know noone really knows what's causing 
> these
> probs (and therefore it's naturally hard to fix them). Also with all
> these bug reports flying around on the mailing list it's a bit hard to
> get the big picture and things tend to get lost in the noise so may I
> suggest that you go to http://www.mythtv.org/bugs/ and we take it from
> there? You can always drop a note to the -dev list with a link to the
> bug to wake everyone up if there's something new.
>
> It sounds like #2 could be related to
> "http://www.mythtv.org/bugs/show_bug.cgi?id=221". Not sure if #1 is
> related to e.g. "http://www.mythtv.org/bugs/show_bug.cgi?id=199" or not
> (create a new bug if unsure).
>
> Then people could add comments with data points which hopefully will
> help us figure out where the problem lies. Some things that would be
> interesting to know is:
>
> 1) Any kind of pattern to the problem: TS/PS? Only certain channels
> (PCRPID different from video PID?) Certain times (commercial break?
> format change? pid change?)
> 2) Is the problem in the recorder/backend or in the player/frontend? If
> possible try playing a recording with mplayer/xine etc. and see if it
> works there. Also try playing an old recording in Myth to see if the
> player can handle that?
> 3) Is it a DVB only problem or does it happen with ATSC, ATSC with DVB
> drivers, analog cards?
> 4) Interesting log msgs when the problem occurs? Backend log? Frontend
> log (-v all)? Mysql log? Syslog? Dmesg? And please don't spam us with
> logs, pick the interesting parts, if there are any... :-)
>
> I'm sorry if I'm stating the obvious or something but I just feel it
> would be nice with a better structure for all the info flying around.
> Good bug reports => quicker fixes :-)
>

Hi,
   I understand that "the devs" are busy.  I am quite familiar with busy 
myself.  I also find that response distinctly unhelpful.

1) I've already posted information that significantly narrows down the 
bug (and put it in the bug report: id=221): e.g. TS only, Channel 
specific, 100% repeatable.  There is more - I suggest you go read the 
bug report if you want it.  All of it has been posted to this list in a 
clear format.

2) I understand "the devs" are busy.  But I'm not asking someone else 
to fix it.  What I *would* like is just a little help understanding how 
the system works so that I can fix it.  This has the advantage that I 
can go on to fix other things.  So far I've asked for help a few times, 
and got nothing but silence.

I'm sorry if I'm stating the obvious or something, but I feel it would 
be nice with a better structure for helping new people help around 
here.  Helping new people help => more devs => quicker fixes and a more 
vibrant community.  If people have to fight to join the mythtv-dev 
community, they wont.

And so I'll ask again.  Where is the best documentation on dvb and 
mpeg2 decoding?  How do I find out what a PCR PID is, and how I might 
see if it is separate from a video PID?  I've tried google searching.  
I've looked through the the linuxtv wiki.  I'm slowly finding stuff, 
but I have the distinct feeling that a few pointers from those who've 
been here before would really speed things up.  It would certainly help 
more than someone telling me what a bug tracking system is.

Yours in frustration,

Will         :-}

--
Dr William Uther                           National ICT Australia
Phone: +61 2 9385 6357               Computer Science and Engineering
Email: willu at cse.unsw.edu.au          University of New South Wales
Web: http://www.cse.unsw.edu.au/~willu/     Sydney, Australia