[mythtv-users] PVR350 + MythTv behaviour

[Boyd II, Willy]

>-----Original Message-----
>From: Olivier [mailto:obrodeur at videotron.ca] 
>Sent: Monday, November 10, 2003 3:19 PM
>To: Discussion about mythtv
>Subject: Re: [mythtv-users] PVR350 + MythTv behaviour
>
>
>
>----- Original Message -----
>From: "Boyd II, Willy" <wboyd at fulbright.com>
>To: "'Discussion about mythtv'" <mythtv-users at mythtv.org>
>Sent: Monday, November 10, 2003 3:29 PM
>Subject: RE: [mythtv-users] PVR350 + MythTv behaviour
>
>
>>
>>
>> >-----Original Message-----
>> >From: Olivier [mailto:obrodeur at videotron.ca]
>> >Sent: Monday, November 10, 2003 2:07 PM
>> >To: Discussion about mythtv
>> >Subject: Re: [mythtv-users] PVR350 + MythTv behaviour
>> >
>> >
>> >> What exactly would you gain by doing that?  I could see the
>> >attraction
>> >> for an analog tuner (i.e., don't do simultaneous encode/decode 
>> >> until you have to so as not to tax the CPU unnecessarily), but if
>> >you have a
>> >> HW encoder & decoder, what are you gaining by not using one of 
>> >> them?
>> >>
>> >
>> >That would eliminate the ring buffer delay. changing 
>channel would be 
>> >instantaneous... and driving waf (wife acceptance
>> >factor) up!  :-)
>>
>> Yeah but then you lose all PVR capabilities (and I'm not so sure how 
>> well
>
>no... my premise, in original email, was that PVR can feed 
>tv-out with line-in *and* encode to disk. If PVR350 can do 
>that, then you would not loose pvr functionality. Otherwise, I 
>agress with you that what I am talking about is pretty much pointless.

I shouldn't have simple stated "all PVR capabilities" in the first sentence,
as it was the time-shifting I was concerned about (as later explained in my
post).  Yes, scheduled recordings and what-not would be just fine.  But you
intend to pause & resume a live feed?  What is the point of simultaneously
encoding to disk then?  If tv-out is coming from the line-in directly, then
you're watching live video.  You can't pause live video... you can halt the
stream in the background, but how does the player know exactly what frame
your live feed was paused at, etc?  The reason we can pause, rewind, etc. is
that we're working with a video stream...  if tv-out is coming directly from
line-in, I'm failing to see how we can expect to perform any manipulations
on that stream.  For instance, say you want an instant replay.  If you hit
Rewind, those previous 10 seconds only exist now on disk.  From line-in,
that data has come and gone.  My only guess would be that the player would
switch on the fly, between piping live-in, and reading from our disk stream.
But then the overhead here, would probably slow things down anyway.

- Willy
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