[mythtv-users] Re: Hardware Recommendations?
tbowman75 at yahoo.com
Sat Jun 4 03:32:58 UTC 2005
Michael T. Dean wrote:
> Todd Bowman wrote:
>> Michael T. Dean wrote:
>>> b) I highly recommend the PVR-x50's (and, personally, wouldn't touch
>>> a frame grabber). If you've got experience with IvyTV, you could
>>> probably get PVR-150 up and running and it's not much more expensive
>>> than "dumb" frame grabbers. If not, there are still some really
>>> good deals on PVR-250MCE's (which are easier to set up).
>> I've looked at the HW MPEG2 encoders but MPEG2 seems to take up too
>> much room. I tried using the SW MPEG2 encoding in MythTV and within
>> one day my 160GB disk was filled. Even though I turned on automatic
>> transcoding to MPEG4, the recordings just seemed to get ahead of the
>> transcoding. Once the disk was full, it couldn't transcode any
>> more. Do the HW encoders produce smaller video files? I don't
>> remember the exact file size but I think a 2.5 hour program was
>> something like 26GB! (640x480)
> 2.5hrs at 26GB would be a 25Mbps bitrate. DVD specification limits
> total bitrate (audio, video, and subtitles) to 10.08Mbps and no DVD
> has a sustained 10.08Mbps (instead, they would use variable bitrate).
> The 10.08Mbps limit on DVD's is appropriate as DVD's have a max
> resolution of 720x480, and above this bitrate, you've definitely
> crossed the point of diminishing returns. So, this would only happen
> with bad recording settings (or, if the 26GB was the transcoded
> version, bad transcode settings).
> My settings are shown on there--720x480 at about 1.15GiB/hr.
Thanks for all of the great information! I guess I'll just spend a
little extra money and get a PVR-250. As a side note, the size of my
2.5hr program turned out to be 51GB. At least I'll be able to record it
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