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All Forums > Tech Talk > Tech Talk Forum Page 62 > DVD playing from S-Video output
AuthorPost
VideoSan All-Star Supporter
All-Star Member

168 Posts
6/03
Posted - Oct 14 2003 : 7:24PM
In the process of trying to play the problem DVD on the laptop (see other Tech Talk post from me about that) and having it go through the TV, I learned that I have an S-Video output on the back of the Thinkpad. I got a S-Video-to-RCA jack converter and ran it into the TV.
I rebooted the machine and I was able to see the display on the TV screen. But when I started Windows Media Player and started the disc, the area to show the video was black. It was successfully displaying on the PC screen. I wasn't sure if the disc in question was copyguarded, so I tried another disc that I'm sure is not copyguarded, and it would also not display. Is this the standard behavior for S-Video output?
GaySatyr
Senior Member

Half dirty ol' man; half horny ol' goat!
1684 Posts
10/00
Posted - Oct 14 2003 : 7:40PM
The S-video output on the ThinkPad (or on anything, for that matter) should be connected to an S-video INPUT on your TV or monitor. S-video output to composite video input (the RCA-jack video input) does not work. There are cables with converters (which you seem to have) but you lose video quality.

Other than the connection, the remaining problem is software and settings. I don't know the capabilities of the Windows Media Player as I do not use it. I use PowerDVD which works quite well. You can go into the control panel settings for the video adapter and route output to the TV-out for the ThinkPad and anything that is on-screen is sent to the television. I don't see why that wouldn't work with WMP as well. Maybe someone else who has a ThinkPad can elaborate.

~ GaySatyr

Edited by - GaySatyr on 10/14/2003 7:46:27 PM

Saki
At-Large

2087 Posts
11/99
Posted - Oct 14 2003 : 8:44PM
My guess is that it has less to do with the Thinkpad S-Video output and more to do with Microsoft's DirectX and WMP using video overlays. Basically, in order to improve video/DVD playback on underpowered PC's, Microsoft has software API's that allow the player to have the video adapter (rather than the computer CPU) process the video image. The result is then mixed (overlaid) with the rest of the screen image and displayed by the video adapter to the monitor.

Unfortunately, this means two things: first, since the video stream is not processed by the CPU, you can't take a screen capture of the video, since there's literally nothing there except a black box on the desktop--a mask where the video stream is displayed. Second, DirectX's video overlay only works on the primary display (i.e your laptop screen) and not cloned secondary displays (i.e. your TV via S-Video).

There are two possible workarounds. First, you can try fiddling with the Thinkpad's display output so that it treats the S-Video port as the primary display (leaving the laptop screen blank or not showing the overlaid video).

Or you can try turning off the video acceleration and overlay capability. I'm using Windows Media Player 9, and I can get to those settings by going to the Tools menu, then Options... then the Performance tab then clicking on the Advanced... button. You can try unchecking the various options there to see if you can get the video to display on your TV. However, if you do this, then you'll probably see jerky video since your laptop's processor will have to decode the video data that your graphics chip was taking care of.

Hope that helps,

- Saki [faqs]

BadKarma
Member

110 Posts
11/00
Posted - Oct 16 2003 : 1:37AM
VideoSan,

I have a Thinkpad T30 (1.8 Ghz P4, 1 GB RAM, WinXP Pro, yada, yada) and I can hook an S-Video cable between the T30 and a television with S-Video In and play a DVD using PowerDVD. I use this setup for demo DVD videos.

I'm basically using the T30 as a high-priced DVD player.

You need a fairly hefty CPU and a decent amount of RAM, otherwise the video playback is not smooth. The T30 works fine, but a Thinkpad T21 (800Mhz P3, 256, Win2k) chokes.

As one who edits video I can tell that you can never have too much CPU, RAM, or disk space :-)

BTW, why do you want to use a Thinkpad to play a DVD? Amazon has DVD players for $39. Buying a DVD player is cheaper than a good S-Video cable.

VideoSan All-Star Supporter
All-Star Member

168 Posts
6/03
Posted - Oct 16 2003 : 5:36PM
As per another post, I was unable to play the DVD on 2 different DVD players, due to the strange authoring on the DVD (see my other recent post in Tech Talk). I was able to play it on the Thinkpad, but was wanting to patch it through to a larger-screen TV. The description that Saki gives indicates the problem. Perhaps PowerDVD would give me the ability to not bypass. I'm running with a pretty good P4 processor and with 512MB of RAM so I might be OK.



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