Alex, thanks for your reply.
The deliverable is a dv/NTSC sd 4:3 of an HD (DVC PRO 720p) originated program.
Here’s exactly what I’m doing from the HD timeline:
Export using Compressor
Destination Desktop
Setting DV/NTSC
Double click that to open Inspector
Click Preview to slide out to a frame to view
Inpector > Encoder
DV/DVCPRO NTSC
Quality: Best
Scan mode : Progressive
Aspect ratio: 4:3 OK
Linear PCM 48Khz 16 bit OK
No setting in Frame Controls or Filters
Inspector > Geometry
Cropping: “Custom” with all settings 0
Frame Size: 720 x 480
Pixel Aspect Ratio: NTSC CCIR 601/dv
Padding: 16 x 9 1.78:1
At this point the Preview image goes into a letterbox, overall size 16 x 9 (identical to the original source) and the image inside the padding is severely scrunched.
This is where I usually turned back, kicked the dog, and tried new settings. Except this time I went ahead and submitted the export. Lo and behold it worked. The image is bad SD with jagged text, but at least the aspect ratio and letterbox are there.
So the sticking point here is that Preview was showing me a letterbox but a smashed image. Preview is not a preview at all. The lesson, skip Preview and just export your test; Preview does not show you what you’ll get.
Again it’s an ugly export but at least it meets the criteria. Any suggestions on improving the image quality appreciated.
MANY THANKS FOR TAKING THE TIME TO HELP WITH THIS!