<div class="gmail_quote">On Mon, Jun 11, 2012 at 4:50 PM, Karl Newman <span dir="ltr"><<a href="mailto:siliconfiend@gmail.com" target="_blank">siliconfiend@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 class="HOEnZb"><div class="h5">On Mon, Jun 11, 2012 at 12:54 PM, David Hofstra <<a href="mailto:dave@dhofstra.com">dave@dhofstra.com</a>> wrote:<br>
> I'm a long-time MythTV user, but I've only ever used Myth to watch<br>
> recordings (not to watch live-tv). I've always used my DirecTV box for<br>
> LiveTV as it was easier for the WAF.<br>
><br>
> I recently purchased a HDHomerun Prime, and switched from DirecTV to<br>
> Xfinity. I found that the Xfinity box on-screen guide is unbearable to<br>
> watch LiveTV... ughh So, I'm trying to use MythTV to watch LiveTV and ditch<br>
> the Xfinity box altogether.<br>
><br>
> Problem: Recordings playback wonderfully 100% on my frontend (and have for<br>
> years). LiveTV stutters about 10 times per hour, and about once per day it<br>
> fails. It almost always stutters a few seconds after the channel change,<br>
> which I hear is to be expected, but then it continues to stutter every so<br>
> many minutes.<br>
><br>
> A) When LiveTV fails, it fails with 'video buffering failed too many times'<br>
> B) When LiveTV stutters, I see a bunch of the following in the frontend<br>
> terminal (infact, I see this when it doesn't stutter also)<br>
> -RingBuf(<filename>): Waited 0.2 seconds for data to become<br>
> available... 15720 < 32768<br>
> -RingBuf(<filename>): Taking too long to be allowed to read..<br>
><br>
> I have a Geforce 210 @1024MB running 295.40 and it is using VDPAU normal<br>
> settings on mythbuntu (OS 12.04)<br>
><br>
> Here's what I have tried so far:<br>
><br>
> 1) Replaced network cables to HDHomerun Prime as well as to the frontend.<br>
> 2) Replaced the hard-drive in the frontend.<br>
> 3) Moved the LiveTV recording group directory to a faster RAID5 drive set<br>
> on the backend (previously on home directory)<br>
> 4) Stopped upmixing stereo to 5.1<br>
> 5) I tried both streaming using the myth:// protocol, and also having the<br>
> liveTV directory on the NFS share directly.<br>
> 6) I tried using every window manager known to man<br>
> 7) Upgraded to the newest 0.25 mythtv-fixes, which updates to a new version<br>
> virtually every day<br>
> 8) I have one other frontend with a Geforce 6150, and while it doesn't seem<br>
> to stutter, the HDTV tearing is so horrible, I cannot really tell if this<br>
> box has the same problem or not.<br>
> 9) I've increased the HD ringbuffer size in the backend-setup<br>
> 10) Some folks note that if you pause LiveTV for a few seconds, then the<br>
> stuttering stops. This also seems to work for me, but I hate to have to<br>
> pause LiveTV every time I change the channel.<br>
><br>
> Does anyone have any other thoughts, or notice something I have not tried<br>
> after looking the above over? Why/How could Recordings be so perfect, and<br>
> LiveTV be so horrible???? Any suggestions appreciated.<br>
><br>
<br>
</div></div>What about Playback -> Extra Audio Buffering? I had similar symptoms<br>
(although much more frequent than 10 times per hour) and this setting<br>
smoothed out Live TV for me with VAAPI on Intel.<br>
<br>
Karl<br>
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</blockquote></div><br><br>I did check, and extra audio buffering is on. Thanks for the suggestion. I've also fiddled with realtime priority threads, neither of which seem to really help anything.<div><br></div><div>
I'm perplexed as to why pausing for a brief second seems to fix the LiveTV problem. I keep wondering what the "HD Ringbuffer size" in the backend is... is that a way to set a large enough buffer for LiveTV?</div>
<div><br></div><div>If a recording is going on, and I watch another recording at the same time, it is perfect, why would LiveTV be any different than this scenario?<br clear="all"><div><br></div><br>
</div>