[mythtv-users] VIA EPIA-M

[Ron Johnson]

On Sat, 2005-03-19 at 20:03 +0100, Torsten Schenkel wrote:
> Am Samstag, den 19.03.2005, 09:17 -0700 schrieb Adam Felson:
> > Live TV doesn't record to the hard drive.
> 
> Well it depends on your definition. It writes to disk and reads from
> disk again. Wether you keep the data on disk or not doesn't matter.
> So from a technical point of view MythTV-LiveTV DOES record to the hard
> disk.
> 
> > Live TV doesn't involve compression or decompression.
> 
> It does, since it doesn't write the uncompressed stream to the disk.
> 
> > Live TV only requires that one frame be read while another frame is
> > being displayed.
> 
> It requires one stream to be read from the card, compressed and written
> to disk, read from disk, decompressed and displayed.
> 
> > Mpeg4 software compression algorithm alone is too much for the little
> > epia.  RTJPEG at low resolution might work, but it would be pushing it.
> > 
> > Replace that with a hardware encoder and all the epia has to do is read
> > from the card, save to the hard drive, run another process to read the
> > same or different data from the hard drive, and run yet another process
> > to display.  
> 
> Now, that's just what I said from the beginning.

To bottom-line this thread:  An "1GHz EPIA-M with a PVR-150" 
should easily be able to watch live TV because...  

- the PVR-150 is H/W encoding to MPEG-2
- a MythTV process is writing that encoded stream to disk
- another process is pushing the encodes stream from disk to the
  Unichrome MPEG-2 decoder.
- the Unichrome driver is pumping the decoded data to the video
  card.

Did I miss anything?

-- 
-----------------------------------------------------------------
Ron Johnson, Jr.
Jefferson, LA USA
PGP Key ID 8834C06B I prefer encrypted mail.

"Before you criticize someone, walk a mile in their shoes. That
way, you'll be a mile from them, and you'll have their shoes."
Jack Handey

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