640 by 360 or 352???

[TjOeNeR]

Hi, I have a question about 16/9 movies.

Is it best to encode them in 640x360 or 640x352?

The difference in aspect ratio (as 360 is correct) isn't really noticeable, but 360 divided by 16 is not a round number (22.5).
So my question is, is it really important to be on the /16 number??? As this way, the luma(color) blocks get filled(without black parts).

Or is a /8 enough?

Greetings
TjOeNeR

[ToS_Maverick]

you could either crop to 352 or use the 624x352 format.

i use 640x352, because on pal dvds in 16:9 you just have to crop 2px from the left/right to get the correct AR (GK with ITU).

[Your_Idol]

No it's not important but you look more like a pro if you use the 16's. Its only 8 pixels just crop them.

[DarkZell666]

you look more like a pro if you use the 16's. haha, using mod-16 resolutions was the only way to go not so long ago with x264 ... Ok we're dealing with xvid, but the "mod16" resolution concept doesn't exist for nothing :)

It's simply that the basic partition of a picture (in many codecs) is a 16x16 pixel block. When truncated, blocks are somewhat subject to degradation somewhere down the line (while encoding, while decoding, during filtering process, etc.).

I'm sure some avisynth filters (or vdub filters for that matter) much prefer mod16 resolutions, otherwise they'll b0rk the picture ...

Pro's don't do things just for the fashion of it you know :p

Imho 640*352 is indeed better than 640*360, and cropping the 8 extra pixels (4 on the top, 4 on the bottom) is indeed better than resizing (because of the aspect ratio).

[Your_Idol]

I just follow suit and it makes me look pro ;)

I knew you guys had a reason.

[henryho_hk]

Use 720x400.

If your player support pixel aspect ratio (PAR), encode at 720x480 and set it as "16:9".

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BTW, you can crop away the black borders (top & bottom) if it is a letterbox footage.