Tim Davies wrote:

Just so you have another point of reference...

I get stuttering on the HDTV video too.  I haven't had any success with AC3
yet, but I haven't tried very hard.  So my testing is based on Seven HD,
which has the MPEG stream too.  And yes, it is a lower bitrate than Nine or
Ten, but they crap out on me at the moment because of the AC3.



7 is good for testing at least. My receiver loads the Dolby Digital Decoder on Sunday when I watched 7HD's loops. Most of the time though, Dolby Pro Logic II is used on all AC3 APIDs on every channel. Not sure if this's a bug in Myth or the stations just broadcast them in 2 channels (although there's a Dolby Digital watermark that says surround sound).

It seems to stutter (~50% of the time) if I *change* to an HD channel.  If I
start on the HD channel, it works fine.  If I record HD and start watching
the recording straight away, it works fine too.

I thought about pausing the stream for a short while to see if the stutter
would go away, but that doesn't work.  So what is it about a channel change?



No ideas on this yet. :( I previously tot my CPU wasn't fast enough (2.6 o/c'd to 2.8) ..

I'm having a look at Mark Anderson's patch now to see what makes it tick.
Should I be able to get this working with software AC3 decoding?



Yes you should (havn't tested it on Mark's patch though). It's a bit crude, on my system, add the line "DEFINES += CONFIG_AC3" in both config.h (you can do that automatically by running "configure --enable_a52" I think) and in settings.pro. Do a distclean and recompile myth.

There's also this option "--enable_a52bin" you can play about with (but this doesn't work last time I was on Mandrake 10.1 CE)..

Also in Mythtv settings->general (or something), make sure "AC3 Passthru" is off.


Regards.

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