[mythtv-users] Digital Broadcast Bitrates?

[Joel Anderson]

> > Hi all,
> >
> > Could anyone share what bitrates they typically see when capturing
> > pure digital SD and HD signals such as via HD3000, DVB-S, or cable STB
> > ala firewire?  I found quite a bit of info in the archives regarding
> > resolutions that are seen, but not much mention of the bitrates.
> >
> > Really I'm trying to figure out what kind of file sizes would be
> > typical of such recordings, to plan for drive space and other hardware
> > considerations.
> 
> 1080i recordings, around 6 to 7 gigabytes per hour.
> 
> 720p recordings, sometimes 6 gb/hour (60fps), sometimes just 3.5 gb/hour
> (presumably 24fps ones)
> 
> DTV STDV recordings -- can vary a lot, but often aruond 1.6 gb/hour
> 
> Transcode 1080i HD recordings to 1280x540px30fps in mpeg 4, thus
> holding 75% of the pixels of 1280x720 (my tv's native resolution) --
> as little as 1.4gb per hour and still looks pretty good.  The 540 lines
> is to allow trivial de-interlace.

Thanks Brad, that's exactly what I was looking for.  :)

-- 
Joel