Video Resizing

Movick wrote on 6/7/2004, 6:28 PM
Hello,

I am working on a piece, which will be downsized from the original 720x480 to float atop an animated background. I will be creating an alpha (partially transparent) overlay graphic, which will sit over the main video window (basically a glorified box which will frame the video). I have edited the segments of this piece at the 720x480 size (not rescaled to the final size) for the sake of easy viewing and layout. I have numerous picture in picture windows, text titles, and graphics appearing throughout this project.

My original thought was to edit the video at full resolution, render it to .avi, then rescale the single .avi file (containing all of the embedded picture in picture and text overlays) to fit the final graphic layout. I’ve created a test segment where I rendered an .avi from the timeline using the DV NTSC template (“do not letterbox”), and I dropped it into a new timeline containing the alpha overlay. I next rendered an MPEG-2 (NTSC DVD). When I play this file back in Win Media Player, there seems to be a discernable loss of quality in the main video, and the picture in picture sections as well. Most notably, there seems to be a significant loss of sharpness, and visible interlacing artifacting. My source video is of good quality (DV CAM).

I spoke to tech support today, and they told me that I should not notice any discernable loss in quality when I resize video, etc. in VV5. Is what I’m seeing in Win Media Player an accurate representation of what this video will look like when played on DVD? Is there a setting that I’m missing? Am I doing something incorrectly? Am I better off resizing each event (pic in pic, etc.) in the original timeline to precise scale including all alpha graphics - rendering the final MPEG-2 from that? Any suggestions would be profoundly appreciated.

Thanks in advance,

Movick

Comments

Spot|DSE wrote on 6/7/2004, 6:41 PM
when you reduce size, you rarely lose quality if it's an avi file. What you are seeing in Media Player is not a perfect representation of what the media will look like on DVD.
If you want to see exactly what it will look like, make a selection of a small area and press SHIFT+CTRL+M. This will open a dialog that will allow you to render to your MPEG template and then open it in your MPEG player.
Sounds more like a problem with settings in your render template.
Movick wrote on 6/7/2004, 7:05 PM
Spot,

I hit shift/ctrl/m and the preview files rendered, however it opened in win media player. What's the difference between that and what I had done?

Movick
Mr_fps wrote on 6/7/2004, 7:53 PM
You may want to try TMPGEnc 3.0 XPress:
http://www.pegasys-inc.com/en/product/te3xp.html
Nice little all around encoding tool I use. Its worth it.
Blues_Jam wrote on 6/8/2004, 12:38 AM
Windows Media Player is not a good previewing choice for making a judgement call on quality ESPECIALLY if you are viewing your MPEG in WMP in FULL SCREEN or any resolution other than 720x480. Check your settings in WMP.

A better choice would be to use DVD Architect to preview if you have it, or a software DVD player such as WinDVD (I think it will play an MPEG-2 ?).

Blues_Jam