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

Michael T. Dean mtdean at thirdcontact.com
Tue Oct 19 16:09:28 UTC 2004

John Thomas wrote:

>On Tue, 19 Oct 2004 04:43:29 -0400, Michael T. Dean
><mtdean at thirdcontact.com> wrote:
>>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
>>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.  :)
>You are correct.  I am at 2200 kbps.  I didn't have my box in front of
>me to verify.
Wasn't trying to pick on you.  Just wanted to make sure the archives 
contain correct information.  :)  Oh, and I agree with your choice of 
2200kbps.  It's what I use for mine (but with a 9800kbps max 
bitrate)--which seems to give the best of both worlds (enough bits for 
fast motion/quickly-changing images, but small file sizes).


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