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

[Allan Wilson]

On 5/22/06, Brian J. Murrell <brian at interlinx.bc.ca> wrote:
>
> Alright, I have been struggling (tolerating, putting up with, etc.) the
> playback performance regression that got introduced with 0.19.  It seems
> that a lot of people here have observed the same thing.
>
> I don't know what happened between 0.18.1 and 0.19, but the _only_ thing
> I did was upgrade the myth software packages on both my BE/FE machine
> and a standalone FE to 0.19 and since that upgrade both of the FE's
> suffer 100% CPU usage and the associated stutters in playback.  Both of
> these systems used to playback perfectly smoothly with 0.18.
>
> This sounds like what a lot of people have been complaining about so
> let's explore why this has happened.
>
> As for my set up, both machines have an nVidia 5200 card in them.  Both
> are SDTV on composite outputs.  Both run the 7676 nvidia driver.  Both
> use Bob de-interlacing (much to my chagrin because a decent output
> device like the G400 doesn't need it -- crappy nvidia 5200's apparently
> do need it).  Other hardware specs are irrelevant since I am comparing
> playback performance on the exact same setups with the only change being
> from Myth 0.18.1 to 0.19.
>
> I don't want to get into checking this this setting and tweaking that
> setting because the root of this problem has to lie in the myth playback
> code.  It is the _only_ thing that has changed here.
>
> Additional evidence of Myth's poor playback performance is that using
> mplayer or xine on the exact same hardware _always_ plays back without a
> blip.
>
> There is something wrong in the myth playback code, let's find it!
> Please?
>
> b.
>
> --
> My other computer is your Microsoft Windows server.
>
> Brian J. Murrell
>
>
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>
Although Brian might have been a little to strong in pointing out that his
problems are for sure with Myth I am having problems playing HD content
inside of Myth but can play the same content with xine and don't have any
problems. I am making sure I have everything setup correctly now but my
processor is not maxed out and it does great in xine with the same hardware
so it sure does look a little funny on the Myth side. I am definately not
complaining though I am happy to get what I can get and I am running some of
the latest svn. Just thought I would add what I noticed to this.

Allan
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