[mythtv-users] pcHDTV support for normal TV over PVR-350

Michael T. Dean mtdean at thirdcontact.com
Tue Oct 19 08:43:29 UTC 2004


John Thomas wrote:

>On Sun, 17 Oct 2004 23:57:37 -0400, Matthew Gleed <mgleed at gleed.us> wrote:
>  
>
>As far as recording size, tt completely depends on the codec bit rate
>that you set in the MythTV settings/configuration.  Mine is at 4400
>and that equates to about 1 GB per hour of recording MPEG2 off of a
>PVR-250.
>
4400kbps (video) equates to approximately 2GiB/hr.

4400kbps * 1000bits/kb = 4400000bits/s * 1B/8b = 550000B/s * 3600s/hr = 
1980000000 B/hr * 1GiB/1073741824B =  1.844GiB/hr

Add in audio, and you've got 2GiB/hr.  (Audio at 256kbps gives 
approximately 110MiB/hr and 384kbps gives approximately 165MiB/hr.)

Therefore, you either have an average bitrate of 2200kbps with a max 
bitrate of 4400kbps, or your files are twice as large as you remember.  :)

Mike


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