Mailing List Archive: Recordings' Video Scrambled When Played Externally

Recordings' Video Scrambled When Played Externally

Jul 30, 2003, 10:16 AM

Post #1 of 4 (1528 views)

Hi, all!

I can play recorded shows within MythTV without problems. However, when
I try to view the recordings using mplayer or encode them using
mencoder, some sections of the video appear scrambled. The scrambled
frames appear to be divided into blocks about 15-20 across and down,
primarily shades of green with some of the underlying frame visible.
Whether I play or encode, the same frames are scrambled the same way.

I tried to capture a screen shot but when I try to open the image, I see
only blue instead of the frame's image. So perhaps this is a video
overlay thing?

I'm using a Matrox G450-eTV card using the mga.o video driver with
MythTV 0.10. I've even created a custom mplayer executable using Matt
Zimmerman's patch but with the same results.

Anyone else seen this problem before? I wonder what MythTV's doing
differently to play the video without any problems?

Thanks in advance for any help!
-- Evan

Re: Recordings' Video Scrambled When Played Externally [ In reply to ]

devale at computer

Jul 30, 2003, 11:53 AM

Post #2 of 4 (1496 views)

Permalink

Evan,

What video codec are you using? I experienced the effect you describe
with RTJPEG, but it did not manifest when I switched to MPEG4. I posted
about it a day or so ago, but no one replied about having experienced it
themselves. My guess is that the majority of folks either use:
A) One of the Win-PVR cards
B) MPEG 4
or
C) Don't re-encode or use other viewers

John

On Wed, 30 Jul 2003, Evan P. Mills wrote:

> Hi, all!
>
> I can play recorded shows within MythTV without problems. However, when
> I try to view the recordings using mplayer or encode them using
> mencoder, some sections of the video appear scrambled. The scrambled
> frames appear to be divided into blocks about 15-20 across and down,
> primarily shades of green with some of the underlying frame visible.
> Whether I play or encode, the same frames are scrambled the same way.
>
> I tried to capture a screen shot but when I try to open the image, I see
> only blue instead of the frame's image. So perhaps this is a video
> overlay thing?
>
> I'm using a Matrox G450-eTV card using the mga.o video driver with
> MythTV 0.10. I've even created a custom mplayer executable using Matt
> Zimmerman's patch but with the same results.
>
> Anyone else seen this problem before? I wonder what MythTV's doing
> differently to play the video without any problems?
>
>
> Thanks in advance for any help!
> -- Evan
>
>

Re: Recordings' Video Scrambled When Played Externally [ In reply to ]

fhathead at nmt

Jul 30, 2003, 9:53 PM

Post #3 of 4 (1492 views)

Permalink

> I tried to capture a screen shot but when I try to open the image, I see
> only blue instead of the frame's image. So perhaps this is a video
> overlay thing?

Dunno about the actual problem, but playing the video directly to X
(mplayer -vo x11) should allow you to take a more useful screenshot. 8-)

--Kevin Lenth

Re: Recordings' Video Scrambled When Played Externally [ In reply to ]

spin at avalon

Aug 6, 2003, 11:54 AM

Post #4 of 4 (1494 views)

Permalink

I have experienced... I might try experimenting with using MPEG4
compression on MythTV just so I can archive my shows. I guess I should
look more deeply into mythtranscode too... maybe it will be good enough
though I do like the way RTJPEG files look...

On Wed, 2003-07-30 at 13:53, devale@computer.org wrote:
> Evan,
>
> What video codec are you using? I experienced the effect you describe
> with RTJPEG, but it did not manifest when I switched to MPEG4. I posted
> about it a day or so ago, but no one replied about having experienced it
> themselves. My guess is that the majority of folks either use:
> A) One of the Win-PVR cards
> B) MPEG 4
> or
> C) Don't re-encode or use other viewers
>
> John
>
>
> On Wed, 30 Jul 2003, Evan P. Mills wrote:
>
> > Hi, all!
> >
> > I can play recorded shows within MythTV without problems. However, when
> > I try to view the recordings using mplayer or encode them using
> > mencoder, some sections of the video appear scrambled. The scrambled
> > frames appear to be divided into blocks about 15-20 across and down,
> > primarily shades of green with some of the underlying frame visible.
> > Whether I play or encode, the same frames are scrambled the same way.
> >
> > I tried to capture a screen shot but when I try to open the image, I see
> > only blue instead of the frame's image. So perhaps this is a video
> > overlay thing?
> >
> > I'm using a Matrox G450-eTV card using the mga.o video driver with
> > MythTV 0.10. I've even created a custom mplayer executable using Matt
> > Zimmerman's patch but with the same results.
> >
> > Anyone else seen this problem before? I wonder what MythTV's doing
> > differently to play the video without any problems?
> >
> >
> > Thanks in advance for any help!
> > -- Evan
> >
> >
>
> ______________________________________________________________________
>
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> mythtv-users@snowman.net
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