Correct Resolutions for DVD,BD
 

I haven't encoded for quite awhile and am behind on some stuff and can't seem to find a guide or anything online.

So, could someone give me the correct resolutions for 4:3 DVD, 16:9 DVD, 720p 4:3, 720p 16:9, 1080p 4:3, 1080p 16:9

For example I see some 16:9 DVD encodes as 704x396, 704x400, 704x480, and 720x480. I'm just wondering which ones are the best to use.

http://en.wikipedia.org/wiki/DVD-Vid...and_frame_rate
http://en.wikipedia.org/wiki/Blu-ray_Disc#Video

4:3 DVD - 720x480 with SAR 4/3, or 640x480
16:9 DVD - 720x480 with SAR 16/9, or 640x360, 704x396(400), or 852(848)x480
720p 4:3 - 960x720
720p 16:9 - 1280x720
1080p 4:3 - 1440x1080
1080p 16:9 - 1920x1080

(sizes in parenthesis are MOD 16 safe)

"SAR 16/9" and "SAR 4/3"?

Screen aspect ratio... Some people use that for "source aspect ratio" but that's not how I use it.

I think some people use DAR for "Display Aspect Ratio". I've seen "Display Aspect Ratio", "Direct Aspect Ratio".

I suppose I should have just said "PAR 32/27" and "PAR 8/9" to avoid confusion?

It's just that I've never heard "screen aspect ratio" before, so it did indeed confuse me. But everyone seems to define SAR differently...
Today I mostly hear SAR as defined in H.264 ("sample aspect ratio" which equals "pixel aspect ratio") or sometimes "storage aspect ratio" (SAR * PAR = DAR).

Another question, why would people resize to 848x480? I usually just thought thats what people downsized from BD to 480p from, what benefit does it have from a DVD?

The video on DVDs is anamorphic, which means that the pixels are not rectangular and have to be resized on display. This means you have 3 options:
a.) let it stay anamorphic
b.) downsize vertically
c.) upsize horizontally

a.) doesn't work reliably with all players and b.) means loss of information, so some people choose option c.), i.e. resizing to something like 848x480. Sometimes people do it when downsizing for a 480p release (from e.g. 1080 lines), too.

same ,me too,I've never heard "screen aspect ratio" before, so it did indeed confuse me. But everyone seems to define SAR differentlyhttp://www.oldjoy.info/jiechiok/images/5.gif