[mythtv-users] 2005 laptop stutters after upgrade from 0.27 to 0.28

Stuart Auchterlonie stuarta at squashedfrog.net
Wed Jun 7 08:37:31 UTC 2017


On 07/06/17 00:36, Mark Perkins wrote:
> 
> 
> On 07/06/17 08:09, faginbagin wrote:
>> Yep, I've still got a few old laptops that have been working quite 
>> well as frontends. But one isn't performing quite as well with mythtv 
>> 0.28 and mythbuntu 16.04 as it is with mythtv 0.27 and mythbuntu 
>> 12.04. So, I'm trying to understand why, and whether there's anything 
>> I can do to get it to perform running 0.28 as well as it does running 
>> 0.27. The laptop and the master backend have multiple boot partitions, 
>> so that's how I switch back and forth between 0.27 and 0.28
>>
>> ...snip...
>>
>> Has anyone else noticed a degradation in performance on older hardware 
>> after upgrading?
>>
>> Any suggestions on how to identify the cause, e.g. OS module, X driver 
>> or mythtv?
>>
>> _______________________________________________
>>
> 
> Just brainstorming a bit here:
> - was the 16.04 install a clean install or a dist-upgrade from 12.04? If 
> clean install have you checked the judder free and frame display timing 
> steps again? https://www.mythtv.org/wiki/User_Manual:JudderFree and 
> https://www.mythtv.org/wiki/Frame_display_timing
> - maybe try cutting mythtv out of the equation for a bit. Move a 
> recording to local drive and compare playback in VLC using both 12.04 
> and 16.04 and look for any differences.
> - maybe try a "complex" transcode on the local test file using ffmpeg on 
> both 12.04 and 16.04 to see if that shows a significant difference or 
> not (something to make the laptop sweat / work hard so small differences 
> might be more readily noticed).

Pull up the playback OSD (from memory m > playback > playback data)
and keep an eye on the frames decoded figures, that should stay as
high as possible

Regards
Stuart



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