[mythtv-users] Bad live TV on Ion

[Bill Williamson]

On Mon, Sep 28, 2009 at 10:24 AM, Kevin Bailey
<ke-myth at retriever.dyndns.org> wrote:
> I didn't want to hijack the Ion performance thread for this issue
> but I'm having trouble playing live TV on my Ion. It seems to play
> at half speed. Maybe you could say it hesitates every second.
> Recorded stuff plays fine.
>
> It plays that way even after the OSD disappears. SD does a little
> better than HD.
>
> I've tried playing with the other options under playback settings
> (use video as time base, opengl, etc.) including changing the
> de-interlacer (mainly the 1x versions).
>
> I set-up real-time threads according to the wiki (and re-logged
> in after adding myself to audio). The console says, "Using realtime
> priority." The mythtvfrontend process has a priority of 20 and
> nice of 0. Don't know if this is right.
>
> Then I assumed that maybe the data was getting buffered in /tmp
> and indeed there's a pipe in /tmp called mythtv-media but
> I don't know why it would be any different for live TV.
> Since I'm using a USB drive, I thought maybe that was slowing it down.
> So I tried doubling the amount of RAM (now making it dual channel)
> and even explicitly mounting /tmp on tmpfs.
>
> My other system plays fine, although it has a different, discrete VDPAU video
> card. The working system uses 180.60, while the Ion uses the new 190.39.
> (190.25 was no better.) The Ion is pointed at ubuntu intrepid/avenard release testing.
>
> Anyone else seeing this ? Anyone have an idea for a setting to tweak ?
> Or know if there's another buffer for live TV ?



Have you tried pausing for 10 seconds IMMEDIATELY after starting
livetv?  I have prebuffering pauses with HD content and a
geforce9500GT running .21 JYA, but 10 seconds of pausing always fixes
it.  The only live TV I watch is the occasional sports and thus I
hadn't thought about it until you mentioned it...