<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Mar 21, 2015 at 3:09 PM, jrh <span dir="ltr"><<a href="mailto:jharbestonus@gmail.com" target="_blank">jharbestonus@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div><div><br><div><blockquote type="cite"><div>On Mar 21, 2015, at 12:56 PM, Dave MythTV <<a href="mailto:dave.mythtv@gmail.com" target="_blank">dave.mythtv@gmail.com</a>> wrote:</div><br><div><div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Mar 6, 2015 at 8:22 PM, jrh <span dir="ltr"><<a href="mailto:jharbestonus@gmail.com" target="_blank">jharbestonus@gmail.com</a>></span> wrote:<br><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>
<br>
Configuration:<br>
Raspberry Pi Slave backends running v 27.4(dated in November)<br>
NFS mount to the Master backend for the mythtv directories.<br>
Hauppauge USB HVR-950Q tuner(1 only ) (configured only 1 virtual tuner so only 1 recording)<br>
I did not configure the analog side of the tuner, only the digital part.<br>
<br>
Using a Raspberry Pi model B and B+:<br>
<br>
Able to record Standard Definition mpg video stream.<br>
When attempting to record 720p or 1080i streams, there would consistently be TFW taking to long errors.<br>
<br>
Using a Raspberry Pi 2 model B: (the quad core version)<br>
<br>
Able to record Standard Definition mpg video stream<br>
Able to record both 720p and 1080i streams up to 15mbps!<br>
<br>
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>
<br>
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>
</blockquote></div><br></div><div class="gmail_extra">Thanks for sharing this information!<br><br></div><div class="gmail_extra">A few quick questions for you:<br></div><div class="gmail_extra">1) Which Linux distribution are you using?<br></div><div class="gmail_extra">2) I'm assuming this testing was with a wired network (and not a USB wireless adapter)? <br></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><br><br></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></div><div class="gmail_extra"><br></div><div class="gmail_extra">Thanks<br></div><div class="gmail_extra">- Dave<br></div></div></div></blockquote></div><br></div></div><div>I am using raspbian off the noobs image.</div><div><br></div><div>You are correct, I just used wired network. I didn’t even want to try going wireless.</div><div><br></div><div>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><br></div><div>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><br></div><div>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><br></div><div>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><br></div><div>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><br></div><div>Regards</div><div><br></div></div></blockquote><div><br></div><div><br></div><div>Thanks for the reply.<br><br></div><div>Remind me again what your usage scenario is?<br><br></div><div><br></div><div>I'm considering a possible usage for myself with a remote slave backend up in the attic, on a wi-fi connection, to allow for separate tuners directly connected to separate directional antennas aimed at some of our fringe stations from nearby cities. Being co-located up in the attic would allow the USB tuners to be directly connected to the antennas (effectively 6 inches or less of coax), minimizing the cable loss and removing the need for multiple additional long coax runs (and possibly pre-amps) to the master backend/frontend in the living room. <br></div><div> <br></div><div>The Raspberry Pi would seem to be a good candidate for this, but if I end up needing two or more Pi 2s to handle the separate tuners individually, I might as well just stick a single x86 ECS LIVA up there instead as the overall price and power consumption would be similar, and the setup would be much simpler. If one of the Pi 1 models could do the task for a single HD stream, however, then even with multiples, the price and power figures swing into their favor. :-)<br><br></div><div>And it's all in that interesting scenario where it would be easy to test with experimentation, but if I try it and it doesn't work, the $$ "wasted" on the Pis could have just bought the LIVA. Hence the interest in the details of what you've been testing!<br></div><div><br></div><div>Thanks<br></div><div>- Dave<br></div></div></div></div>