[mythtv] [mythtv-commits] Ticket #2706: Unable to 'watch' Digital Music channels with HDHomeRun

[Steven Adeff]

On 11/21/06, Daniel Kristjansson <danielk at cuymedia.net> wrote:
> On Tue, 2006-11-21 at 09:06 -0500, Andrew Kimpton wrote:
> > Quoting Daniel Kristjansson <danielk at cuymedia.net>:
> > > Where is the DVB Radio descriptor? What does the SDT table look like?
> > >
> > > DVB != MPEG
> >
> > It's not radio - I guess my 'Digital Music' heading sent things in the
> > wrong direction. These channels are the music channels most US Cable
> > TV companies include in their 'digital' package I don't think they're
> > 'radio' in the truest sense - more just audio with static pictures.
> Right, this is what I was saying, this is not DVB Radio and is not
> supported. Only one variant of 'Digital Music' is supported, and
> that is the 'DVB Radio' variant. The way 'DVB Radio' was implemented
> causes too many problems, so I'm not extending that to other
> 'Digital Music' variants.
>
> > > Anyway, if you want to implement this correctly, change the NVP so it
> > > can handle there being no video, or in this case very little video, in
> > > the the stream. You will find the NVP in libs/libmythtv/NuppelVideoPlayer.cpp
> >
> > OK - I'll start looking there. Is it likely that if NVP doesn't see an
> > I-Frame for a certain period it will effectively timeout and stop
> > things ?
> It will not begin playing until it sees a frame, but there is more
> to it than that. Just read the code a couple times over, that's the
> best documentation. Look especially at the V-Sync, the A/V Sync,
> and the decoding and display threads.
>
> >  Is that where  the 'V' letter in the LAGV (?) text of the OSD
> > comes from ?
> Nope, that's for the VCT. Each of the characters is described in the
> MythTV documentation.
>
> > The files on disc in the recordings directory are zero length too -
> > does that continue to point to a frontend/player problem ? Or are
> > those files truncated on an abnormal stop ?
> Well, you will have to hack the signalmonitor a little bit to allow
> recording audio only streams, these streams are disabled there because
> they cause major problems on the frontend. But you can bypass that
> step by just ripping a track off one of your CD's into the MP3 format,
> then figure out what prevents it from playing as a MythTV recording
> in the NVP.

from what I found when scanning my cable for QAM channels, I found
that the video stream would send out still images every so often (like
every 5 seconds). The best way to do this would be to catch this still
image and just repeat it constantly while playing the audio PID. This
is basically what the cable boxes do. I also wasn't able to find a way
to figure out which video PID matched which audio PID.

-- 
Steve
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