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why does render change aspect ratio
I have a ntsc 720×480 project that I’m trying to render out to the same aspect ratio. When I start the render to a mp4 file, the preview window changes and then says I have a 672×512 preview and a 672×512 project. I’ve also noticed that the render has very short black bars at the top and bottom of the video. Any idea of what is happening?
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4 Replies
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You are trying to render a format that uses non-square pixels (NTSC DV PAR 0.9091) to a format that uses square pixels (MP4 PAR 1.000). The correct resolution for NTSC DV in square pixels is 655×480. Try rendering to that resolution and see if it fixes things.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
When would one use square vs. non square pixels? Maybe I need to go back to my original intent. My end game is to play my rendered file on a mac and view on an attached projector in a 4:3 format. I’ve found our macs handle the mp4 formats very well, mpgs not so much so I tend to always render out to mp4s. We also burn these files to a DVD for playing through that medium.
What is a good initial project template and what would be a good render template? If you could provide some suggestions I would be greatly appreciative. -
[Larry Cole] “When would one use square vs. non square pixels?”
It all depends on the playback device. If you were making a DVD, you would maintain the non-square pixels because a TV/DVD player will display them correctly. If you want to play back on a PC/Mac, you would use square pixels because computer screens have square pixels and the player software usually assumes that all pixels are square.
[Larry Cole] “What is a good initial project template and what would be a good render template? If you could provide some suggestions I would be greatly appreciative.”
A good project template would match the media so I would use the NTSC DV project template. For DVD your render template should be MPEG2 with the NTSC DVD setting. For a PC/Mac you should use MainConcept AVC MP4 and convert to square pixels using one of the “Internet” templates.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Great advice. Thank you very much.
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