[mythtv-users] Sluggish watch recordings list after 0.27 upgrade.

Jim Stichnoth stichnot at gmail.com
Tue Dec 3 18:06:04 UTC 2013


On Tue, Dec 3, 2013 at 7:13 AM, Bryan Bennetts <bryan.bennetts at gmail.com>wrote:

> Hi all,
>
> I've upgraded to mythbuntu 13.10/mythtv 0.27 and am now finding that one
> of my frontend's Watch Recordings view is somewhat sluggish.
>
> That machine is a Acer Revo 3700 (with 4G of ram IIRC) so not hugely
> over-powered but on 0.26 there was no perceivable issue.  I have tried
> creating my own MythBuntu theme with the fanart turned off, but that has
> not improved performance.
>
> It *seems* to be related to the length of the episodes list as when
> scrolling down the left hand panel it is noticably faster for, say, films
> (split second scrolling) than children's programs (of which we have plenty,
> can take a good 3-4 seconds to populate the right hand panel).  This
> implies that the menu *may* be doing an operation per episode.
>
> Anyone have any thoughts on how to diagnose/resolve this?
>

I have this same issue on my ION frontends.  I believe it has to do with a
0.27 change where the frontend now asks the backend to generate preview
images at full resolution before scaling locally to the theme-specified
resolution, instead of generating smaller preview images on the backend
which are rescaled again on the frontend.  I bet the difference in
snappiness you observed is related to the preview image file size, which
you can find by looking for the preview file in somewhere like
~/.mythtv/remotecache/ .  You could probably confirm this by disabling
preview images in your theme.

To further confuse the issue, older recordings may be reusing older,
smaller preview images on the backend and/or in the frontend remotecache
directory, so for a truly fair comparison you'd want to remove *.png files
from your Recordings storage group directories so that they get regenerated.

Jim
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