[mythtv] 0.18 Choppy audio and video on some uk freeview dvbchannels

Jason jandmspam at earthlink.net
Sun Apr 17 20:38:40 UTC 2005


I'm seeing similar problems with straight 0.18.  I repeat this is 0.18 
tarball (not CVS).

Symptom is choppy audio/video.  Sounds kind of like when people beat on 
their chests to impersonate a helicopter news update.  Some channels 
seem _better_ than others.

I'm using 2 pchdtv (hd-3000).   Watching free over the air ATSC.  My 
backend is a 1.8 Athlon.  Connected to 3.2 P4 via 100 Mbps LAN.  With my 
old setup playback was flawless.

Things I changed...
Kernel: from 2.6.10 to 2.6.11
mythtv: from .17 to .18
Driver: from pchdtv2.0 (v4l) to pchdtv2.0 (dvb)

If I change the dvb settings to record TS instead of PS seems to fix the 
video on all channels and the audio on _some_ channels.   Some channels 
now totally lose their audio.

Using +/- to change audio streams has no effect.

> Anyone else finding that the latest CVS and DVB loses audio very 
> frequently? For me it appears as if it is auto switching audio streams.
>  
> Any ideas?
>
>  
> On 4/17/05, *John Harvey* <john.p.harvey at btinternet.com 
> <mailto:john.p.harvey at btinternet.com>> wrote:
>
>     I set the "Use Hardware MPEG decoder" option in mythtv-setup to
>     fix this
>     problem. Before setting this I had the same problem with the 350
>     though the
>     video plays back ok in mplayer and if you disable the use of the
>     350 for
>     playback (which was how I watched a recording that was like this).
>     I haven't tried switching to recording TS to see if that helps though.
>
>     John
>
>     > -----Original Message-----
>     > From: mythtv-dev-bounces at mythtv.org
>     <mailto:mythtv-dev-bounces at mythtv.org>
>     [mailto:mythtv-dev-bounces at mythtv.org
>     <mailto:mythtv-dev-bounces at mythtv.org>]
>     > On Behalf Of Greg Grotsky
>     > Sent: 17 April 2005 20:13
>     > To: Development of mythtv
>     > Subject: Re: [mythtv] 0.18 Choppy audio and video on some uk
>     freeview
>     > dvbchannels
>     >
>     > Roger,
>     >
>     > Try running mythtv-setup and switching the recording type on
>     your card
>     > from PS to TS.  I found an issue that came up from a CVS commit from
>     > March 27 to March 29th that broke a couple channels on my setup...
>     > switching to TS fixed the problem.  It turns out that those channels
>     > that were broken have mulitple audio streams associated with
>     them.  If
>     > they have more than one stream you may have to hit '+' to get the
>     > stream to play when watching the channel in TS mode.
>     >
>     > Good luck,
>     >
>     > -Greg
>     >
>     > On 4/17/05, Roger James <roger at beardandsandals.co.uk
>     <mailto:roger at beardandsandals.co.uk>> wrote:
>     > >
>     > > I have just upgraded to 0.18 and I now have a problem with
>     certain UK
>     > > freeview channels (DVB-T) viewed as live TV. I was running a
>     CVS build
>     > from
>     > > about a month ago and that was working perfectly.
>     > >
>     > > There are no error messages appearing in the logs, so maybe
>     the problem
>     > is
>     > > different than the one already reported on the list (Re:
>     [mythtv] A/V
>     > Bug in
>     > > CVS from 12:00am 3/27 to 12:00am 3/29).
>     > >
>     > > The problem manifests as choppy audio and jerky video which seems
>     > similar to
>     > > the problem already reported. The choppiness is very regular
>     at approx
>     > 500ms
>     > > repeat rate (this suggest some sort of timing problem)
>     > >
>     > > The channels it appears on are constant, but are not related
>     to a single
>     > > multiplex. I have not been able to determine what the common
>     factor is.
>     > <clip>
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