[mythtv-users] Mythpreviewgen

Taylor Ralph taylor.ralph at gmail.com
Mon Oct 17 17:25:20 UTC 2011

On Sun, Oct 16, 2011 at 12:03 PM, Josu Lazkano <josu.lazkano at gmail.com> wrote:
> 2011/10/16 Taylor Ralph <taylor.ralph at gmail.com>:
>> On Sun, Oct 16, 2011 at 7:10 AM, Josu Lazkano <josu.lazkano at gmail.com> wrote:
>>> 2011/10/15 Taylor Ralph <taylor.ralph at gmail.com>:
>>>> If you are running ext4 on the backend you can try disabling barriers.
>>> Hello, I am using EXT3 on the system hard disk and XFS on the
>>> recording disk, I must check some here?
>> Those filesystem types are fine.
>>> The system disk is a 2.5 160GB, here is all the software and the mysql server.
>>>> On the the frontend I assume you are using VDPAU. In the case of VDPAU
>>>> you can provide more video buffers by setting vdpaubuffersize=32 in
>>>> the filter section of the video profile.  This will help the frontend
>>>> handle longer periods of no data transfer.
>>> I just configure the buffersize to 32, I have a laptop to run the
>>> frontend without VDPAU and there is too little playback stops.
>> If that doesn't help then remove the vdpaubuffersize option since it
>> will consume large amounts of video memory
>>>> One more thing to check is to make sure you are not running "VDPAU
>>>> Advanced" playback profile since the ION can not handle Advanced 2X
>>>> deinterlacing for HD material. You should run "VDPAU Normal".
>>> On the ION backen/frontend I have this configuration on VDPAU:
>>> VDPAU Slim:
>>> http://dl.dropbox.com/u/1541853/vdpau/vdpau1.png
>>> http://dl.dropbox.com/u/1541853/vdpau/vdpau2.png
>>> http://dl.dropbox.com/u/1541853/vdpau/vdpau3.png
>> You are using VDPAU Slim which should be fine.
>>>> And make sure you are running the very latest code since an audio fix
>>>> was recently committed that could trigger playback glitches.
>>> Which is the fix? I am using debian.multimedia repository package:
>>> http://debian-multimedia.org/dists/stable/main/binary-i386/package/mythtv.php
>> Your packages are for the 0.24.1 release (June 2011) and doesn't
>> contain anything committed since then. You need
>> https://github.com/MythTV/mythtv/commit/35468d7d5ce5af18280c8753775e3b54f7ceaf40
>> which was committed on Oct. 5th.
>> I didn't realize you were playing back on a laptop. It's possible that
>> your CPU is throttling and possibly slowing down your IO/memory
>> performance. Could you try disabling anytype of CPU throttling and see
>> if that helps? Also, please provide the graphics chipset and video
>> memory you are using.
>> Regards.
>> --
>> Taylor
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> Thanks Taylor, I am using a HTPC with Nvidia ION plataform as
> frontend/backend, but I try the laptop to test the mythpreviewgen
> pauses on it. I think it is not related to playback, because I use
> different profiles on both frontends and there are little stops on
> playback (Normal and VDPAU Slim profiles).

Are you using one or two DIMMs? The ION platform supports dual-channel
memory but some chose to only install a single DIMM which limits


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