[mythtv-users] Quality of DVD playback NOT equal to mid-grade DVD player

Buechler, Mark R Mark_R_Buechler at bausch.com
Sun Aug 1 16:44:12 EDT 2004

Firstly, you should check to see if your modem indeed supports 720p
natively. I know my Sony projection TV claims to but it really scales the
video down to 480p. If I were you I'd change to 960x540 which is the highest
you'll get without going to interlaced modes.

Secondly, if your DVD is encoded interlaced then you'll need to tell xine to
deinterlace it. I've configured one of my remote buttons to do just that.

Yes, the modeline determines if it is interlaced or noninterlaced. If the
word "Interlaced" appears after the modeline then it's interlaced. Only the
newest Nvidia drivers support this.

Also keep in mind that the latest Nvidia drivers differ on 960x540 than
older drivers. I know for me at that resolution my TV went into 1080i mode
(which makes sense given the frequencies) but when using the newest drivers
(the ones which support interlaced modes) my TV assumes the mode to be 720p
which then gets scaled to 480p and displayed. Because of this I've switched
back to an older version.

- Mark.

-----Original Message-----
From: john roberts [mailto:homepagez at lycos.com] 
Sent: Sunday, August 01, 2004 9:13 AM
To: mythtv-users at mythtv.org
Subject: [mythtv-users] Quality of DVD playback NOT equal to mid-grade DVD

Hello - I've been a happy user of Mythtv for almost a year now... I use it
mostly for music, games, tv and DIVX archive of movies.

Once in a while I slap a DVD into mythDVD (which is using the latest version
of xine) and I wonder "hummm - I THINK the playback quality is not the same
as my old Progressive scan DVD player...  I should plug the old DVD player
back in and check..."

So - I finally got to checking this - and sure enough - there is a HUGE
difference in playback quality.

My DVD player is a mid-grade Progressive Scan DVD player - and I'm feeding
the TV (Samsung DLP 16x9 model) via component video.

The Mythtv is using a FX5500 via a DVI connection.  I'm using Xine 0.99.1
for DVD playback under mythtv and I have the latest nVidia drivers loaded.

My Modeline looks like:

        # 1280x720 @ 60.00 Hz (GTF) hsync: 44.76 kHz; pclk: 74.48 MHz
            Modeline "1280x720_60.00"  74.48  1280 1336 1472 1664  720 721
724 746  -HSync +Vsync

One thing I never understood about Modelines - does the modeline determine
if you send an interlaced or a non-interlaced signal? 

The effects I see are (when playing back with MythDVD):

- Colors don't seem as sharp
- Interlace issues - jagged with movement

Any ideas on what I should look at to improve this?  I had to resort to
connecting the old progressive DVD player to play DVD's.

Any help would be great,

Thanks everyone,


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