[mythtv-users] Myth on WD HDTV Media Player for $99
Andrew Gallatin
gallatin at cs.duke.edu
Tue Oct 13 13:52:52 UTC 2009
Yeechang Lee [ylee at pobox.com] wrote:
> Andrew Gallatin <gallatin at cs.duke.edu> says:
> > I'm one of these people. I bought an ION a few months ago, and it
> > works great, except that Myth (with or without VDPAU)and XBMC,
> > mplayer, etc barf on about 1/2 my HD recordings due to my local
> > broadcasters using advanced MPEG2 telecine settings on their
> > encoders.
>
> As I've advised you before, use Tom Dexter's patch
> (<URL:http://www.gossamer-threads.com/lists/mythtv/users/388902#388902>).
> It's not a perfect solution but, as both Tom and I can testify, it
> *works*.
Those patches seem to address interlacing, but the problem is worse
than interlacing autodetection always flipping between
progressive/interlaced. If that was all that it was, it would be
tolerable since there is a manual setting to lock it. In fact, the
trunk that I was last using (0.22 from a month ago) didn't seem
to flip back and forth for me. But playback still sucked for me.
The problem I'm having happens even on 720p material as described
here: http://www.gossamer-threads.com/lists/mythtv/dev/319838
As DanielK said in that thread, the problem is caused by the
broadcaster using "an encoding extension we don't support very
well. These streams do in fact play on powerful MythTV machines. I
believe they are broadcasting about 40 fps on a 60fps stream and
marking some of the frames as repeatable .... MythTV doesn't know what
is going on and so the only way it adjusts is with the A/V sync
code. This works, but is CPU intensive."
All my problematic files have these repeatable flags as confirmed by
an mpeg analyzer. These problematic files are both 720p and 1080i.
None of my smoothly playing files (again, both 720p and 1080i) have
these flags.
Thats' why I'm hoping for some Myth solution where hardware handles
the entire mpeg playback process, including decoding these repeatable
flags and handling audio sync, and software can't screw things up.
I was hoping VDPAU did that, but I guess it doesn't. The BCM thing
is my next hope.
Drew
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