[mythtv-users] RAID versus Drobo
beww at beww.org
Mon Sep 10 19:15:02 UTC 2007
Eric Robinson wrote:
>> Have a look at this:
>> Of course if you plan to record one stream while watching another,
>> record multiple streams, or do anything else requiring disk I/O at the
>> same time you'll want more than that chart implies.
> Umm... If you're pointing to the graph on that page then it's a little
> different. That's completely Raw HD. Nothing in MythTV is done in
> Raw. My understanding is that it's Mpeg2 generally and can be converted
> using Mythtranscode to some version of mpeg4. In any event, I figure
> MythTV buffers a certain portion of the video on the frontend before
> beginning to play in case of heavy network jitter. One hour of 1080p
> content is 7GB or so, right? I feel like I read that somewhere in the
> docs... Anyone have any success stories with playing back HD content
> and with what drive interface speed?
Ooops, right you are. I confused your thread with another from another
group and sent you the wrong link.
You might look at:
(though it's a bit dry and obscure), or:
Basically the full G3 data rate for an ATSC transport stream is 19.4
Mbps, so if your storage system can handle that you should have no
problems with a single stream, even if it's using the full available
bandwidth (which most don't).
I've had no problems playing back HD (as the original MPEG2 or MPEG4
(H264-2)) from a single PATA or SATA drive. I haven' tried multiple
streams but from the specs it should work for 2 or even 3 streams
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