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).
http://mythtv.info/moin.cgi/UserManual_2fTechnicalDetailsAppendix_2fRecordingParameters
My settings are shown on there--720x480 at about 1.15GiB/hr.
Mike
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