Though some newer boards offer SAS controllers on board which are also backward compatible with SATA drives.<br>--James<br><br><div><span class="gmail_quote">On 9/10/07, <b class="gmail_sendername">Brian Wood</b> <<a href="mailto:beww@beww.org">
beww@beww.org</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Eric Robinson wrote:<br>> Brian Wood wrote:<br>>> Eric Robinson wrote:
<br>>><br>>><br>>>>> Have a look at this:<br>>>>><br>>>>> <a href="http://library.creativecow.net/articles/gerard_rick/premiere-pro-HD.php">http://library.creativecow.net/articles/gerard_rick/premiere-pro-HD.php
</a><br>>>>><br>>>>> Of course if you plan to record one stream while watching another,<br>>>>> record multiple streams, or do anything else requiring disk I/O at the<br>>>>> same time you'll want more than that chart implies.
<br>>>>><br>>>>><br>>>> Umm... If you're pointing to the graph on that page then it's a little<br>>>> different. That's completely Raw HD. Nothing in MythTV is done in
<br>>>> Raw. My understanding is that it's Mpeg2 generally and can be converted<br>>>> using Mythtranscode to some version of mpeg4. In any event, I figure<br>>>> MythTV buffers a certain portion of the video on the frontend before
<br>>>> beginning to play in case of heavy network jitter. One hour of 1080p<br>>>> content is 7GB or so, right? I feel like I read that somewhere in the<br>>>> docs... Anyone have any success stories with playing back HD content
<br>>>> and with what drive interface speed?<br>>>><br>>> Ooops, right you are. I confused your thread with another from another<br>>> group and sent you the wrong link.<br>>><br>>> You might look at:
<br>>><br>>> <a href="http://broadcastengineering.com/news/broadcasting_psip_data_broadcasting/">http://broadcastengineering.com/news/broadcasting_psip_data_broadcasting/</a><br>>><br>>> (though it's a bit dry and obscure), or:
<br>>><br>>> <a href="http://en.wikipedia.org/wiki/ATSC_Standards">http://en.wikipedia.org/wiki/ATSC_Standards</a><br>>><br>>> Basically the full G3 data rate for an ATSC transport stream is 19.4<br>
>> Mbps, so if your storage system can handle that you should have no<br>>> problems with a single stream, even if it's using the full available<br>>> bandwidth (which most don't).<br>>><br>
>> I've had no problems playing back HD (as the original MPEG2 or MPEG4<br>>> (H264-2)) from a single PATA or SATA drive. I haven' tried multiple<br>>> streams but from the specs it should work for 2 or even 3 streams
<br>>> without trouble.<br>>><br>> Ahh, good stuff! The Wiki link you sent has this for the actual quote,<br>> though:<br>> "Terrestrial (local) broadcasters use 8-VSB modulation that can transfer
<br>> at a maximum rate of 19.39 Mbit/s, sufficient to carry several video and<br>> audio programs and metadata."<br>><br>> I may be misinterpreting an ambiguous sentence but that sounds like<br>> 19.39
Mbit/s is for multiple channels? Or by "programs" do they mean<br>> streams (as in one video with multiple language tracks)...?<br><br>They can send multiple videos. That speed is the "transport stream",
<br>which can contain one or more "program streams".<br><br>><br>> Either way, I think I'm fine with software SATA RAID-5...<br><br>Agreed, totally.<br><br>With PC hardware you're not going to get anything faster than ATA in
<br>either the P or S incarnation. You'd have to go to SCSI drives, and even<br>then most consumer mobos have only 32-bit PCI slots and most U320 cards<br>want a 64-bit controller, as do most hardware RAID5 cards.<br>
<br>I have heard of PCI-Express RAID cards, but I don't know anything about<br>them.<br><br>beww<br><br>_______________________________________________<br>mythtv-users mailing list<br><a href="mailto:mythtv-users@mythtv.org">
mythtv-users@mythtv.org</a><br><a href="http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users">http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users</a><br></blockquote></div><br>