[mythtv-users] playback performance regression: show of hands

[Leighton Brough]

>     > Ditto here. Almost exclusively with HD content, but definitely
>     having
>     > worse performance under 0.19-fixes svn 9519 and lower than with
>     0.18.
>     > Content plays fine in Mplayer or Xine.
>     >
>     >
>     I too had the same problem with HD content. Are you using the
>     'denoise3d' playback filter? I suspect this has changed and is the
>     cause
>     of the problem.
>
>     I installed an antenna amplifier and removed some unecessary
>     splitters
>     at the same time as the upgrade from 0.18 to 0.19, which gives me
>     perfect reception, so I could remove this filter. Also, the 'adjust'
>     filter is automatically applied for DVB now in 0.19, so I could remove
>     this too (I don't know if leaving it in the config means it's applied
>     twice or not).
>
>     Now I'm just using the kernel deinterlacing filter, and the CPU
>     consumption is totally reasonable again.
>
>
> I read the wiki and looked in MythWeb to see if I was using any 
> filters and it didn't look like it. Is there somewhere else that I 
> should check to see if I am using any of these filters? Also why would 
> you need these filters with HD content or is that what you are saying 
> that they are designed for SD content therefore don't work right with HD?
>
> Allan
There is some information on the Wiki here:

http://www.mythtv.org/wiki/index.php/Using_playback_filters

although I think this is a bit out of date. This is more up to date I think:

http://www.mythtv.org/docs/mythtv-HOWTO-10.html#ss10.4

(Now that I read this, I realise what I wrote above is not quite right, 
the 'adjust' filter is only automatically applied with the bt8x8 
drivers, which I am using, not DVB in general)

Basically, you can find the filter settings in your playback settings. 
The filters are for both HD and SD. Various filters do various things. 
There are filters to clean up a noisy or weak signal (which I was using, 
but don't need now that I have an antenna amplifier), deinterlace etc. 
Some of these can use a lot of CPU.

I don't know whether the increase in CPU usage for HD from 0.18 to 0.19 
is due to changes in the filters or something else, but certainly I 
found removing some filters brought the CPU consumption back to 
reasonable levels for me.

Leighton