<div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Feb 28, 2013 at 12:15 PM, Karl Newman <span dir="ltr"><<a href="mailto:newmank1@asme.org" target="_blank">newmank1@asme.org</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"><div class="gmail_quote">On Thu, Feb 28, 2013 at 8:05 AM, Paul Gardiner <span dir="ltr"><<a href="mailto:lists@glidos.net" target="_blank">lists@glidos.net</a>></span> wrote:<br>
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<div><div>On 28/02/2013 15:39, Mike Perkins wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 28/02/13 12:15, Paul Gardiner wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 28/02/2013 12:01, Mike Perkins wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 28/02/13 08:23, Paul Gardiner wrote:<br>
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On 27/02/2013 22:04, Thomas Börkel wrote:<br>
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HI!<br>
<br>
I have now tried many things, but I am running out of ideas.<br>
<br>
* it happens usually every 2-10 minutes<br>
* it happens for HD h264 and SD MPEG2, just for HD a little more often<br>
* it happens with and without VDPAU<br>
* it happened on old and upgraded hardware (only sound card identical)<br>
* it happens on 0.26 and earlier versions<br>
* I have tried all VDPAU profiles<br>
* I have disabled logging over NFS (> /dev/null)<br>
* I have enabled realtime prio (but it is not mentioned in the log)<br>
* I have reniced mythfrontend to -2 and X to -12<br>
* I have set the GPU to max. frequency all the time, so no switching<br>
* I have disabled the often crashing mythlcdserver<br>
* I have tried different kernel and NVidia driver versions<br>
<br>
What else can I try? What more info should I provide?<br>
<br>
Probably, something needs a little CPU time every now and then and<br>
this<br>
probably causes that little "jump" in playback and the log entry from<br>
the subject, but I don't know what it is and why MythTV is so<br>
sensitive<br>
on such hardware specs (Core i3, 3.1 GHz)?<br>
<br>
Or does it probably have something to do with the fact that this is a<br>
diskless PXE frontend?<br>
<br>
Any hints would be greatly appreciated.<br>
</blockquote>
<br>
None of the myth systems I've built have ever synchronized AV<br>
correctly.<br>
I've always had to pause and unpause every now and then to regain sync<br>
and even then it's to get it to a consitentish 100ms which I then<br>
correct within my AV receiver. It's odd, because every other player<br>
I've<br>
tried with my recordings or downloads show them correctly in sync.<br>
<br>
</blockquote>
My diskless PXE frontend has never had problems with AV sync. I use NFS<br>
to mount the root but not for media directories. On the other hand, my<br>
sound comes out the TV. Perhaps it is the "AV receiver" which is the<br>
common variable?<br>
</blockquote>
<br>
I have wondered that. I will test, although several of the myth systems<br>
I was referring to were connected direct to speakers, and the sync was<br>
always variable and depended on the last user command. I think my<br>
current frontend may be pretty much ok when I'm not using different<br>
screen modes for different video resolutions, but I'm not sure of that.<br>
Need to do more testing.<br>
<br>
What CPU are you running?<br>
<br>
</blockquote>
My current front end is one of these:<br>
<br>
<a href="http://www.newegg.com/Product/Product.aspx?Item=N82E16813131663" target="_blank">http://www.newegg.com/Product/<u></u>Product.aspx?Item=<u></u>N82E16813131663</a><br>
<br>
That outputs via HDMI. A previous incarnation had a C7 VIA chip which<br>
output using VGA and 3.5 mm stereo into the TV. No problems either way.<br>
</blockquote>
<br></div></div>
Nice. Will that do HQ scaling and Advanced 2x deinterlacing? Maybe I<br>
should upgrade. In any case, you are using an Atom too, so the A/V<br>
sync problem isn't down to processing power.<br>
<br>
Just realised that with my current set up, it will be difficult to<br>
remove the AV receiver: it's my only AMP, and the TV has no speakers.<br>
I can try moving to HDMI audio from spdif again, but last time I<br>
tried that it made sync worse. I never have sync problems with<br>
my blu-ray player, so I sort of doubt it is caused by the amp,<br>
but I'd like to rule it out. I guess I just need to borrow a little<br>
mobile speaker from someone.<br>
<br>
BTW, do you know what the "playback details" display measures A/V<br>
sync in?<span><font color="#888888"><br>
<br>
P.</font></span><br></blockquote></div><br></div></div>Some TVs can do video processing which can induce delay. Usually there's a setting or a mode which disables this (something like Game Mode should do it). This may not be the cause of your problem, but it might be worth looking into.</blockquote>
<div><br></div><div style>Indeed, if you split your audio and video signal to different devices, you are subject to any processing delays imposed by those devices. I have seen TV's that introduce well over 100ms of lag (a few whole frames of video) with some settings. The ability to adjust the sync is one feature I like about mythtv that I believe is completely overlooked by most folks. Even with a high end BlueRay player feeding a top of the line TV and Audio setup, you can end up with noticeably out of sync audio.</div>
</div></div></div>