[mythtv-users] Strange Live Tv synchronization problem

[Matthew K. Lee]

On 7/13/05, Matteo <mosarg at gmail.com> wrote:
> Hi,
> This is the first time for me in this list.
> I just set up my first myth box and almost everything works fine.
> My system is composed of a VIA EPIA ML8000 PVR-250
> 512 Mb DDR 200 GB hdd maxtor.
> Tv recordings are perfect and playbacks too.
> I use via unichrome driver for hw accellerated mpg2 playback and cpu
> utilization is around 20 %.
> The only problem I noticed regards Live Tv: for 20 30 seconds the output
> is perfect, audio and video are perfectly syncronized, then for  1-2
> seconds Myth drops frames and audio becomes choppy to become perfect
> again for other 20-30 seconds and this strange beheaviour repeats for as
> long as I watch Live TV CPU utilization is around 30 40 % (res 720x 576).
> My hdd settings are :
> 
> 
>  /dev/hdc:
>  multcount    = 16 (on)
>  IO_support   =  3 (32-bit w/sync)
>  unmaskirq    =  1 (on)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    = 256 (on)
>  geometry     = 24792/255/63, sectors = 398297088, start = 0
> 
> I added this line to /etc/sysctl.conf
> vm/min_free_kbytes=131072
> 
> to always leave some memory free.
> 
> 
> I don't know what to anymore.
> 
> Big big thanks to anyone answering.
> 
> 
> 
> 
> 
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> 

I've noticed the same sort of thing after I change channels in LiveTV
mode.  I've found that it will ususally go away if I pause LiveTV for
a second (or two) to let the buffer fill.

Matt.