[mythtv-users] Poor H.264 1080p playback

Richard Shaw hobbes1069 at gmail.com
Tue Jan 8 13:56:25 UTC 2019

On Tue, Jan 8, 2019 at 5:04 AM John Pilkington <johnpilk222 at gmail.com>

> On 06/01/2019 19:28, Richard Shaw wrote:
> > Ok, so I didn't know about the VDPAU # of processors option. I changed
> > it to 4 and playback was much better. Not quite perfect, but nothing
> > that anyone other than me in the house would notice.
> This thread surprised me.  I don't have much H.264 material, and what I
> do have is from UK DVB-T2 recordings with data rates IIRC less than 3
> GB/hr.  I have a GT710 and a 2.6 GHz core2duo processor, both much less
> potent than Richard's. I hadn't noticed the number-of-processors option
> either; I have now set it to 2.

I just checked one of my bigger archives and the video bitrate averages
24.1 Mb/hr (33Mb/s peak).

Using simple math (divide by 8 for bytes, times 3600 for hours, divided by
1000 for GB (not GiB) gives me almost 11GB/hr.

atop now shows individual cpu loads of less than 5% on playback of this
> material.  When I first installed the GT710 I reported a lack of
> 'solidity' in the picture during panning, but newer drivers from
> rpmfusion and profiles in MythTV now give playback as good as I get from
> UPnP or the firestick 4K 20181124 mythfrontend.

I'll remote in and check atop while playing back a movie and see what the
load is. I don't suspect that the CPU is being pegged but there's a lot
that goes on to keep the video and audio in sync. Maybe more of a latency
issue than throughput.

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