You are converting from square pixels to NTSC PAR.
Okay, thanks for the quick response. Upon my brief google search of square pixels and PAR I can somewhat understand this. However, I'm sure this issue must have been dealt with before. Any suggestions on how to correct? I would think part of the bottom and top of the frame would be cropped to allow the horizontal to encompass the entire frame. Am I on the right track? This is what I did when encoding with Adobe Media Encoder but again it just seemed to lower the detail drastically when compared to not cropping/zooming.
Yep, you need to crop the top and bottom of the frame. Should be 8 pixels/lines off of both the top and bottom.
Just in case I did something wrong, I decided to re-convert a clip. This time I verified 8 pixels off the top and bottom. The preview in Adobe Media Encoder did worry me as the output definitely looked softer (less sharp, less focused) than the original. I let it convert and compared the file to an identical uncropped version. The difference is obvious. The cropped file lost so much detail. Why on earth is this happening? I am going to a lower resolution on both files but they look so different.
Why on earth is this happening?
- You're going from HD to SD.
- You're going from progressive to interlaced scanning.
- You're going from one framerate (23.976p, 29.97p, 59.94p) to another (29.97i).
- You're using Adobe Media Encoder, which results in questionable quality on such exports.
You can reduce but not eliminate some of the quality loss (at the expense of time) by using the Maximum Render Quality (MRQ) option in the encoder setup window. In the flyout menu (that tiny icon that looks like a stack of pancakes with downward-facing triangle), check that "Use Maximum Render Quality" is enabled. You should see somewhat better results, in approximately five times however long you waited for the original export.
Colin, thanks for the info and tip. I understand what you are stating, however, why is it the quality loss is so great when the frame is cropped by just 16 pixels? If I do not crop and otherwise use identical compression settings the video looks great. Cropped looks terrible. With this I can come to the conclusion that statements 1 thru 4 are not pertinent because all settings are identical with exception to the slight crop.
Oh, perhaps it is because with the extra 16 horizontal pixels being thrown out, the video is expanded both horizontally and vertically to fill the frame. In that case, wouldn't it just be prudent to let the vertical black bars on either side just remain?
Your statement in step 4 implies the possibility of using a different encoder; correct? Would you suggest I transcode prior to importing to Premiere?
Thanks for all of your help.