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MediaPortal 1
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Many discontinuities when simultaneously recording from 3 tuners
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<blockquote data-quote="rsenden" data-source="post: 1108976" data-attributes="member: 24295"><p>Thanks again for the responses. I did some additional testing, and indeed it looks like a USB bandwidth problem. I connected the tuners to my laptop, which has both USB 2.0 and USB 3.0 controllers. When connecting the H7 and T-Stick Dual to the same USB controller (either 2.0 or 3.0), I can reproduce the discontinuity issue. When connecting the devices to different USB controllers, all 3 tuners can record simultaneously without any discontinuities.</p><p></p><p>Apparently the USB controller limits the combined bandwidth for all connected USB 2.0 devices to 480Mbit/sec, even if it is a USB 3.0 controller. I was previously assuming that each individual USB port could handle up to 480Mbit/sec.</p><p></p><p>I also tried some other things, like connecting the two tuner devices to an external (powered) USB 3.0 hub. I was hoping that this would use the USB 3.0 bandwidth to transfer the multiple USB 2.0 data streams, but apparently an USB 3.0 hub acts as both a USB 2.0 and USB 3.0 hub. So for USB 2.0 devices, the USB 2.0 electrical wiring is used to connect to the host PC, again limiting the combined bandwidth to 480Mbit/sec.</p><p></p><p>Now the question remains whether there are any solutions for this. I can think of the following:</p><ul> <li data-xf-list-type="ul">Use some device (cable, hub, dock) to convert the USB 2.0 signal into a USB 3.0 signal, such that the controller can use the full USB 3.0 bandwidth for one of the tuner devices. Does anyone know whether such a device exists for a reasonable price?</li> <li data-xf-list-type="ul">Use a Thunderbolt dock or Kanex adapter to add additional USB ports via the Thunderbolt port. I'm assuming this would add an additional USB controller, but unfortunately this solution is quite expensive.</li> <li data-xf-list-type="ul">Connect one of the tuner devices to my NAS or router, and use for example <a href="http://usbip.sourceforge.net/" target="_blank">http://usbip.sourceforge.net/</a> to make this available as a remote USB device on the Mac Mini. This would probably be the cheapest solution, but probably also the least stable. Anyone ever tried something like this?</li> <li data-xf-list-type="ul">Any other solutions?</li> </ul><p>Thanks,</p><p></p><p>Ruud</p></blockquote><p></p>
[QUOTE="rsenden, post: 1108976, member: 24295"] Thanks again for the responses. I did some additional testing, and indeed it looks like a USB bandwidth problem. I connected the tuners to my laptop, which has both USB 2.0 and USB 3.0 controllers. When connecting the H7 and T-Stick Dual to the same USB controller (either 2.0 or 3.0), I can reproduce the discontinuity issue. When connecting the devices to different USB controllers, all 3 tuners can record simultaneously without any discontinuities. Apparently the USB controller limits the combined bandwidth for all connected USB 2.0 devices to 480Mbit/sec, even if it is a USB 3.0 controller. I was previously assuming that each individual USB port could handle up to 480Mbit/sec. I also tried some other things, like connecting the two tuner devices to an external (powered) USB 3.0 hub. I was hoping that this would use the USB 3.0 bandwidth to transfer the multiple USB 2.0 data streams, but apparently an USB 3.0 hub acts as both a USB 2.0 and USB 3.0 hub. So for USB 2.0 devices, the USB 2.0 electrical wiring is used to connect to the host PC, again limiting the combined bandwidth to 480Mbit/sec. Now the question remains whether there are any solutions for this. I can think of the following: [LIST] [*]Use some device (cable, hub, dock) to convert the USB 2.0 signal into a USB 3.0 signal, such that the controller can use the full USB 3.0 bandwidth for one of the tuner devices. Does anyone know whether such a device exists for a reasonable price? [*]Use a Thunderbolt dock or Kanex adapter to add additional USB ports via the Thunderbolt port. I'm assuming this would add an additional USB controller, but unfortunately this solution is quite expensive. [*]Connect one of the tuner devices to my NAS or router, and use for example [url]http://usbip.sourceforge.net/[/url] to make this available as a remote USB device on the Mac Mini. This would probably be the cheapest solution, but probably also the least stable. Anyone ever tried something like this? [*]Any other solutions? [/LIST] Thanks, Ruud [/QUOTE]
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