Cropped Edges on Playback

[madrabbit]

When I play back a recorded program on my standalone DVD recorder, there is no loss of the picture along the edges. However, if I compile a new dvd with the vob files from my recorder, I lose the edges of the picture on playback.

Why is my DVD recorder able to create a DVD that keeps the picture inside the safe area, but not my authoring software? I've used both TMPGEnc and Womble. Same results.

[edDV]

Overscan is usually a monitor issue not a player issue. Are you watching the DVD author results on the computer monitor and the DVD recorder on a TV?

[madrabbit]

I burned the authoring result to DVD and I'm watching in on the DVD recorder connected to a TV.

I understand the concept of overscan, but I don't understand how my DVD recorder can avoid cropping on playback while DVDs that I create with the same vob files and played back on the same machine cannot.

[SmokieStover]

Can you post a digital Pic of both: 1) Recorded DVD from recorder/player to TV; and 2) Reauthored DVD from recorded/player to TV?

Do the DVD's play with similar results from a standard DVD player?

I'm confused about "cropped". Are you talking about a 4:3 video on a 4:3 TV, or what?

[madrabbit]

I can't take a picture of my TV screen, but I can simulate what I'm seeing.

The top image is what plays back after recording my on DVD recorder. It looks exactly as it did when it aired live.

I took the vob file from that recorded DVD and made a new DVD with my authoring software. When I play back that DVD on my television, the picture looks as it does in the bottom image.

[edDV]

I capped the analog ESPN1 off Comcast here to a 704x480 project timeline. It was somewhat narrow and H shifted right but all 480 vertical lines are there. My 4:3 TV displays similar to your lower picture (overscanned).

704x480


This indicates your top image (DVD recorder) is displayed full to edges and the lower image (DVD authoring program) is cropped. My DVD authoring program isn't cropping. There must be a crop setting in your software.

You would want the lower image for computer playback or web page playback (e.g. YouTube).

[edDV]

For reference, here is the ESPN-HD 704x480i downscale


And the 1280x720p --- click on picture to see full size.


Yes the graphic highlight is clipping at 235

[madrabbit]

I capped the analog ESPN1 off Comcast here to a 704x480 project timeline. It was somewhat narrow and H shifted right but all 480 vertical lines are there. My 4:3 TV displays similar to your lower picture (overscanned).

That is exactly the problem I'm having. How do you prevent the overscanning? My DVD recorder can do it. Why can't authoring software?

This indicates your top image (DVD recorder) is displayed full to edges and the lower image (DVD authoring program) is cropped. My DVD authoring program isn't cropping. There must be a crop setting in your software.

But the file from my DVD authoring program (as well as the burned DVD) does not appear cropped when I play it on my PC.

[guns1inger]

Your PC monitor and software players do not have overscan areas like a television does, so you see everything.

Authoring tools take the same video, without changing it, and create a new DVD. If there is overscan, there always was. Unless you re-encoeding the video somewhere along the way.

[madrabbit]

Here's a sample, if anyone wants to see what I'm working with. I recorded a 15 second clip with my DVD recorder. These are the files from the disc:

http://www.madrabbit.net/temp/dvd_recorder.rar (7 mb)

When played, everything stays within the boundaries of my visible TV screen. If I I make any edits to the vob file and reauthor the DVD, I have the problem with overscanning. That's what I'm trying to avoid.

[edDV]

Here's a sample, if anyone wants to see what I'm working with. I recorded a 15 second clip with my DVD recorder. These are the files from the disc:

http://www.madrabbit.net/temp/dvd_recorder.rar (7 mb)

When played, everything stays within the boundaries of my visible TV screen. If I I make any edits to the vob file and reauthor the DVD, I have the problem with overscanning. That's what I'm trying to avoid.

So do all your authored DVDR's overscan? Do commercial DVD's?
That would indicate the DVD recorder treats recorded material different from DVD playeback. If only authored material gets cropped, it would indicate the authoring program is the source of the crop.

[madrabbit]

The files that I posted, when burned to a DVD, play correctly on all three of my standard (non-recorders) standalone DVD players. It can't be a case of my recorder treating recorded files differently.

Even though I'm careful to not re-encode, something is happening in the editing process that results in overscanning.

The problem is not my authoring software. If I reauthor that vob file with no edits, it's fine.