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Posted by Andrew Rossmann on 04/05/06 21:07
In article <1238avfohtcq203@corp.supernews.com>, me@privacy.net says...
> Could someone kindly describe the sequence of events which permits the
> 'Pausing' of live TV by a HDD/DVD recorder. How complicated is the
> sequence of commands needed to get this to happen ?
>
> I assume the recorder must be in some sort of standby state, then has to
> wake up, start recording, freeze the first recorded image and somehow
> present this on the TV until told to start replaying the stream still
> being recorded.
>
> Is this about right and specifically how is the live broadcast on the TV
> replaced by the first recorded and paused image ?
Actually, it's usually much simpler. It is ALWAYS recording to a
buffer on the disk. What you are seeing is a playback from that buffer,
with a one-half to one second delay from true 'live' (you can see it if
you have a PIP or split-screen TV, with one input from the DVR and
another live from antenna or cable). When you pause, it keeps recording
(up to the buffer limit) but just not playing back. Depending on how
noisy the drive is, if you pause it for awhile and then start playing,
you may hear more seek noise as it bounces back and forth between the
recording point and the playback point.
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