[mythtv-users] compiling performance question

[Andrew (AFPup) Stadt]

On 2019-02-17 1:45 p.m., Tim Draper wrote:
>   ---- On Fri, 15 Feb 2019 08:17:24 +0000 Stephen Worthington <stephen_agent at jsw.gen.nz> wrote ----
>   > On Thu, 14 Feb 2019 21:12:28 +0000, you wrote:
>   >
>   > >ran it the other night with make -j4 (dual core celeron N2830). 70mins for fixes/30. while it does seem excessively long it is something i could put up with if it were the only thing. The other issues i'm also having with the FE i'm wondering if it's time to call it a day and replace. £120 base hardware over 4-5 years isnt bad innings.
>   > >I'm seriously looking at replacing the FE and going back to a nvidia gpu for VDPAU. amd a4,nvidia710 and pico psu seems to be a reasonably low-powered & compact way forward...
>   >
>   > Until you want 4K.  I do not think a 710 does 4K.  I just got a
>   > fanless 1030 to replace a 220 with a fan that died and killed the
>   > chip.  This for my test PC, not a main MythTV box, but so far it has
>   > impressed me.  I do not have any 4K screens to test it with to see how
>   > well that works though.  The 1030 cards I have seen here come in two
>   > different varieties - one uses a PCIe x8 slot, and one PCIe x16.  If
>   > you have a motherboard that has PCIe 3.0 slots, you can use a PCIe x8
>   > version and it will run faster than the PCIe x16 one will when using a
>   > slot that is PCIe version < 2.  I did not realise the one I had
>   > ordered was PCIe x8 until it arrived, so I am currently running it in
>   > a motherboard that is too old to run it at full speed.  So if I do get
>   > to trying 4K, I may have to shift it to my main MythTV box for that.
>
> good point on 4k. Currently on a 42" 1080p panasonic plasma tv. about 10year old now so wonder how long it'll last for. no reason to replace it so it'll probably run till it's dead.
> still cant bite the bullet on a new FE. 95% sure i've found an issue with my channel setup, and i've been playing around the avsync2&vaapi2 with the current fixes/30 git commit specifically with the AVsync2 changes. celeron FE seems to currently work best on vaapi2/avsync1.

Been running a 1030 in one frontend, had to limit to 1080, card just 
couldn't keep up with even medium bitrate  4k.

Looking at some of the release notes for the nVidia driver, an update 
might fix it, but I just don't have enough 4k material for it to be 
worth my while.

Andrew.