[mythtv-users] Choppy hd live tv playback with HD3000

Brandon Beattie brandon+myth at linuxis.us
Mon Dec 19 19:19:14 EST 2005

On Mon, Dec 19, 2005 at 03:42:11PM -0800, Mark Johannessen wrote:
> I have been able to install mythtv/mythweb sucessfully (after about a
> weekend of work) on the following box:
> Intel Celeron 2.66 gHz
> 768 ram
> Nvidia e-GeForce MX4000 AGP card
> Soundbalster audio card
> FC4
> The system is hooked up to an HD antenna and the signal is fine,
> channels can be selected, audio from the sound card works, mythweb
> works, etc.  However, when either playing live TV or playing back
> recorded shows, the playback studders.  It plays for a couple of
> seconds, studders, and plays for another couple of seconds, and so
> forth.  The pattern is regular.  I have plenty of HD space, using an
> LVM with jsf format.
> According the pcHDTV site, the HD3000 requires the following:
> The minimum recommended hardware requirements for playback of HDTV
> streams recorded by pcHDTV cards are:
> Intel(r) Pentium(r) 1200Mhz or higher
> NVIDIA card with IDCT acceleration for machines under 2000MHz (Note:
> with the current drivers on the nvidia site downloaded and operating
> it think - I get the nvidia splash screen on boot)
> Sound card (S/Pdif output required for 5.1 audio)
> 256 Meg RAM or higher
> The minimum recommended hardware requirements for recording of HDTV
> streams by pcHDTV cards are:
> Linux Kernel 2.6.12 for DVB driver (Recommended)
> Linux Kernel 2.4.26 for Video4Linux driver (Optional)
> Intel(r) Pentium(r) 400Mhz or higher
> 128 Meg RAM or higher
> One available PCI 2.2 slot
> Hard drive capable of writing 6MB/s
> I seem to have met these requirements, yet I have a choppiness
> problem.  From the spec sheet on the card I don't see IDCT mentioned,
> but it does mention "full OpenGL ICD" support.
> Does this look like a video card issue (even though I appear to have
> the processor speed) or has someone found this problem and a different
> solution?

A 1.2Ghz is fine for playback with mplayer, xine, and so on but Not
Myth.  You can try using libmpeg (See settings->playback->page 1) which
may not use as much cpu for decoding.  FFmpeg that is used for Myth uses
more CPU than other players because it does more than just display



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