<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Wed, May 13, 2015 at 7:52 AM, Gary Buhrmaster <span dir="ltr"><<a href="mailto:gary.buhrmaster@gmail.com" target="_blank">gary.buhrmaster@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Wed, May 13, 2015 at 12:30 AM, Fred Hamilton <<a href="mailto:fred@yonkitime.com" target="_blank">fred@yonkitime.com</a>> wrote:<br>
<span>> However "cat /dev/video0 > temp.ts" always works (if it's run before<br>
> MythBackend tries to record something. After Mythbackend tries and fails,<br>
> "cat /dev/video0 > temp.ts" starts producing zero byte recordings as well.<br>
> So it seems like the hardware and driver are OK until mythbackend tries to<br>
> use it.<br>
<br>
</span>This suggests a more basic OS issue. Did you happen<br>
to upgrade the OS/kernel recently (or add another USB<br>
device to the mix)? There have been some recent fixes<br>
in the kernel for various USB issues, and it is possible<br>
that you are hitting a regression.</blockquote><div><br></div><div>That's sort-of what I'm thinking - something that was intermittent (perhaps unrelated) turned permanent after an update. Unfortunately I haven't been logging system/Myth updates vs HD-PVR functionality.<br></div><div><br></div><div>I don't *think* it's the OS because <span>"cat /dev/video0 > temp.ts" works, and</span> I have the same problem on Ubuntu 14.04.2 and a newly-installed 15.04 with different kernels (3.16 and 3.19). So maybe it was a Myth 0.28 update?<br></div></div></div></div>