[mythtv] Ticket #9341: H264 doesn't play back watchably on Windows frontend

[Jerry Rubinow]

On Mon, Dec 6, 2010 at 10:53 PM, Robert McNamara
<robert.mcnamara at gmail.com>wrote:

> On Mon, Dec 6, 2010 at 7:50 PM, Jerry Rubinow <jerrymr at gmail.com> wrote:
> > On Mon, Dec 6, 2010 at 10:37 PM, <noreply at mythtv.org> wrote:
> >>
> >> #9341: H264 doesn't play back watchably on Windows frontend
> >>
> >>
> -----------------------------------------------+---------------------------
> >>  Reporter:  Jerry Rubinow <jerrymr@…>          |          Owner:  nigel
> >>     Type:  Bug Report                         |         Status:  closed
> >>  Priority:  minor                              |      Milestone:
>  unknown
> >> Component:  Ports - Windows                    |        Version:
> >>  Severity:  medium                             |  0.23-fixes
> >>  Keywords:                                     |     Resolution:
>  Invalid
> >>                                               |  Ticket locked:  0
> >>
> >>
> -----------------------------------------------+---------------------------
> >> Changes (by robertm):
> >>
> >>  * status:  new => closed
> >>  * resolution:   => Invalid
> >>
> >>
> >> Comment:
> >>
> >>  Your Ion box isn't even close to powerful enough to handle that content
> >> in
> >>  Windows, for which MythTV lacks hardware decode support.
> >
> > I considered this possibility but figured the CPU usage would be much
> > higher, instead of just around 35%.  Shouldn't it be pegged?  In any
> case,
> > thanks for the quick turnaround on the ticket.
> > -Jerry
>
> You may wish to follow the progress of this ticket:
>
> http://svn.mythtv.org/trac/ticket/8620
>
> When Myth supports DXVA in Windows, you may have more hope.  As it
> stands, however, Myth on Windows on ION with anything besides low to
> moderate bitrate material, particularly H.264, will probably be a
> recipe for disappointment.
>
> Robert
>

I did try lowering the bitrate on the default recording profile during one
test to ~2000, but it seemed to have no effect on the pausing.

So is the bottleneck the GPU and not the CPU?  I don't know enough about the
pipeline the compressed stream takes on its way to being displayed, but I'd
like to understand why the CPU usage isn't higher.

Thanks,
Jerry
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mythtv.org/pipermail/mythtv-dev/attachments/20101206/eb5c7e8d/attachment.htm>