Mailing List Archive: MythTV: Users

frontend constantly skipping/dropping frames

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rawgarlic at gmail

Jan 2, 2008, 10:28 PM

Post #1 of 5 (695 views)
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frontend constantly skipping/dropping frames

This is newly installed frontend only system:

Motherboard: VIA PC2500
Processor: VIA C7-D 1.5GHz
North Bridge: VIA CN700
South Bridge: VIA VT8237R Plus
Memory: 512MB DDRII 533MHz SDRAM
Graphics: VIA UniChrome Pro IGP
LAN Chipset: VIA VT6103 PHY
Audio Chipset: Realtek ALC655

Yes, this is just basic low end hardware.

The only problem is that the video playback is not smooth.
It is constantly skipping/dropping frames.

How can I fix this?

I am running "top" and:
With no frontend running the CPU is at about 2%.
With the frontend running the CPU is at about 80%
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goofygrin at gmail

Jan 2, 2008, 10:45 PM

Post #2 of 5 (646 views)
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Re: frontend constantly skipping/dropping frames [In reply to]

On 1/3/08, R <rawgarlic [at] gmail> wrote:
> This is newly installed frontend only system:
>
> Motherboard: VIA PC2500
> Processor: VIA C7-D 1.5GHz
> North Bridge: VIA CN700
> South Bridge: VIA VT8237R Plus
> Memory: 512MB DDRII 533MHz SDRAM
> Graphics: VIA UniChrome Pro IGP
> LAN Chipset: VIA VT6103 PHY
> Audio Chipset: Realtek ALC655
>
> Yes, this is just basic low end hardware.
>
> The only problem is that the video playback is not smooth.
> It is constantly skipping/dropping frames.
>
> How can I fix this?
>
> I am running "top" and:
> With no frontend running the CPU is at about 2%.
> With the frontend running the CPU is at about 80%
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

Have you tried running with XvMC enabled?
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rawgarlic at gmail

Jan 2, 2008, 10:52 PM

Post #3 of 5 (669 views)
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Re: frontend constantly skipping/dropping frames [In reply to]

> Have you tried running with XvMC enabled?
> _______________________________________________

Nope, I did not do that.
Don't know how to do it.
Please tell me.
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mythtv at calidris

Jan 3, 2008, 5:08 AM

Post #4 of 5 (641 views)
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Re: frontend constantly skipping/dropping frames [In reply to]

On Thursday 03 Jan 2008, R wrote:
> > Have you tried running with XvMC enabled?
> > _______________________________________________
>
> Nope, I did not do that.
> Don't know how to do it.
> Please tell me.

I've got a similar issue using a Jetway 1.2Ghz C7 board and 1Gb of memory.
Mine seems to pause in time with disk access. I recently did a

glxinfo > tmp.txt

and that caused the video to pause whilst it wrote the file, which leads me to
believe I have a problem with disk access causing pauses in playback.

XvMC didn't seem to help with me, but you could try it. In your front end
look in:

Utilities/Setup
Setup
TV Settings
Playback

and change the preferred MPEG2 decoder. There's a Via XvMC option you can try
here too.

Tim.

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pebender at san

Jan 3, 2008, 9:15 AM

Post #5 of 5 (635 views)
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Re: frontend constantly skipping/dropping frames [In reply to]

Tim Sawyer wrote:
> On Thursday 03 Jan 2008, R wrote:
>>> Have you tried running with XvMC enabled?
>>> _______________________________________________
>> Nope, I did not do that.
>> Don't know how to do it.
>> Please tell me.
>
> I've got a similar issue using a Jetway 1.2Ghz C7 board and 1Gb of memory.
> Mine seems to pause in time with disk access. I recently did a
>
> glxinfo > tmp.txt
>
> and that caused the video to pause whilst it wrote the file, which leads me to
> believe I have a problem with disk access causing pauses in playback.
>
> XvMC didn't seem to help with me, but you could try it. In your front end
> look in:
>
> Utilities/Setup
> Setup
> TV Settings
> Playback
>
> and change the preferred MPEG2 decoder. There's a Via XvMC option you can try
> here too.

If it is a disk access problem (which is possible given VIA's problem
prone chipsets) and it is a frontend only machine, then it he might try
diskless booting.
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