[mythtv-users] Bitrate oddity

[Boleslaw Ciesielski]

f-myth-users at media.mit.edu wrote:
> I'm using PVR-250's/350's, w/bitrate of 4500 and max bitrate of 6000
> (e.g., the defaults).  I typically record 64 minutes per 1h show
> (e.g., I pre- and post-roll by 2m).  The resulting files are all
> within 1% of 2,500,000,000 bytes (written this way so you know I
> mean decimal bytes, e.g., 2.5 gigabytes and -not- 2.5 gibibytes.)
> 
> But if you actually do the math...
> 
>     > dc
>     4500 1024 60 64 *** 8 / f
>     2211840000
> 
> ... it's pretty clear that 4500 kilobits/sec -should- be generating
> only 2.2 gigabytes in 64 minutes.  (And that's assuming that the use
> of "kilobits" in the UI really means 1024 bits, and not 1000 bits,
> or the discrepancy is even larger.)

AFAIK, audio has it's own bitrate and it's not counted as part of the 
video bitrate.

Bolek