<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Mar 21, 2015, at 12:56 PM, Dave MythTV <<a href="mailto:dave.mythtv@gmail.com" class="">dave.mythtv@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><br class=""><div class="gmail_extra"><br class=""><div class="gmail_quote">On Fri, Mar 6, 2015 at 8:22 PM, jrh <span dir="ltr" class=""><<a href="mailto:jharbestonus@gmail.com" target="_blank" class="">jharbestonus@gmail.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I have experimented some using the raspberry pi as a slave backend server and have had generally good results with caveats.<br class="">
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Configuration:<br class="">
Raspberry Pi Slave backends running v 27.4(dated in November)<br class="">
NFS mount to the Master backend for the mythtv directories.<br class="">
Hauppauge USB HVR-950Q tuner(1 only ) (configured only 1 virtual tuner so only 1 recording)<br class="">
I did not configure the analog side of the tuner, only the digital part.<br class="">
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Using a Raspberry Pi model B and B+:<br class="">
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Able to record Standard Definition mpg video stream.<br class="">
When attempting to record 720p or 1080i streams, there would consistently be TFW taking to long errors.<br class="">
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Using a Raspberry Pi 2 model B: (the quad core version)<br class="">
<br class="">
Able to record Standard Definition mpg video stream<br class="">
Able to record both 720p and 1080i streams up to 15mbps!<br class="">
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In summary, for 1 stream and a USB TV stick The RPi 2 is a viable masterbackend with the above conditions. I didn’t try multiple streams off the same real channel, but I suspicion the Pi 2 would be able to handle it.<br class="">
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Note that I did not try analog recording as there are no analog NTSC Over the air broadcast stations in the area and so I didn’t even try to configure the analog side.<br class="">
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</blockquote></div><br class=""><br class=""></div><div class="gmail_extra">Thanks for sharing this information!<br class=""><br class=""></div><div class="gmail_extra">A few quick questions for you:<br class=""></div><div class="gmail_extra">1) Which Linux distribution are you using?<br class=""></div><div class="gmail_extra">2) I'm assuming this testing was with a wired network (and not a USB wireless adapter)? <br class=""></div><div class="gmail_extra">3) Do you have any thoughts on the source of the TFW errors on the Pi 1? Such as, whether the TFW errors with the Pi 1 were related to the CPU loading, pushing the data out across the network, or a limitation of the USB system? (Since it kept up OK with standard definition streams, I'm wondering if the Pi 1 might be sufficient as a high-definition slave backend if it recorded directly to a small local USB hard drive, or even to its own SD card, and then did a non-realtime NFS data transfer back to the master backend when the tuner was idle?)<br class=""><br class=""><br class=""></div><div class="gmail_extra">Keep us posted on how things go if you try multiple streams or multiple tuners on the Pi 2!<br class=""></div><div class="gmail_extra"><br class=""></div><div class="gmail_extra">Thanks<br class=""></div><div class="gmail_extra">- Dave<br class=""></div><div class="gmail_extra"><br class=""></div></div></div></blockquote></div><br class=""><div class="">I am using raspbian off the noobs image.</div><div class=""><br class=""></div><div class="">You are correct, I just used wired network. I didn’t even want to try going wireless.</div><div class=""><br class=""></div><div class="">I didn’t even try experimenting using a local usb drive as that wouldn’t fit my usage scenario, so are still all good questions.</div><div class=""><br class=""></div><div class="">I will be staying with a single USB tuner for my needs, and Since I started using the RPi 2 configured as above, I have had no TFW errors since starting to use it!</div><div class=""><br class=""></div><div class="">I have no plans whatsoever to try to use an RPi of any kind as a frontend, however, they are very insteresting as a remote backend like I am using. The pi 2 plus the hauppauge USB tuner are only using around 7 watts while recording!</div><div class=""><br class=""></div><div class="">By the Way, I noticed I goofed above when I said it was a viable master backend. I meant to say it is a viable SLAVE backend.</div><div class=""><br class=""></div><div class="">An experiment I might try sometime in the future is to have an RPi as a masterbackend ONLY with no tuners(just define a dummy recorder). No immediate plans to try that tho yet.</div><div class=""><br class=""></div><div class="">Regards</div><div class=""><br class=""></div></body></html>