A Size of a DIVX Wide screen version And Vcd

[Aaliyah_Fan_Forever]

I Hv a problem again,while converting to VCD NTSC..i cant keep the Wide Screen Size of tha original Divx one..i know it'll be like that bc im converting it to vcd so
the sizes:
Divx (Wide Sscreen) : 640X272
VCD (NTSC):352x240

im trying to keep it on 640x272 of size..can i do that with TMPGEnc?
i heard aboutt he Clip frame thing..i tried but it got more worst..a bit worst actually..but its not 640x272...

can anyone HELP Me??

[Baldrick]

http://www.vcdhelp.com/forum/viewtopic.php?p=419749#419749
and it will be black borders(letterboxed). VCD is 352x280, you cant change that but with black borders will it become widescreen.

[Aaliyah_Fan_Forever]

Does it remove or cut any part if i do blackboarders?

[EddyH]

>_< oh, goddamnit, i wasted 15 minutes on a detailed answer with stuff for normal and widescreen, but the stupid board logged me out and it got lost when i pressed send. who sets a web board to a 15 minute logout?!

anyway. baldrick, nice try but don't blind the newbies with wrong info; vcd is 352x288, or more commonly and in this case 352x240.

as for aliyah fan, the size you want is one of the following:
width always 352

height either 128, 136, or 144.

reasoning:
divx is made for PC screen that is an exact 4:3 ratio. so if you had something that would fill the TV screen, at 640 pixels wide, it would be 480 pixels tall. note how that is exactly twice the 240 vcd height.... very conventient (for other sizes eg 512x384 it gets more complicated but the theory is the same)
So, for an exact conversion (ignoring 640 going down to 352 as the width/height ratios are slightly different) your encode should be 136 high centred in the 240 high screen.

However, with mpg encoding, it's good if you can get it a multiple of 8 high (as 136 is). much better if you can manage to get it to match up on the 8 pixel boundaries (which all frames use to divide up their basic picture and motion encoding) ie a multiple of 16, which the nearest ones are 128 or 144; best yet if you can get it on 16 pixel boundaries (used for extra compression in b-frames), = multiple of 32 high, which 128 is the only close one.

All it does is affect the efficiency and quality of encoding slightly, as well as altering the apparent size on the TV screen. 136, though that 272 is already -slightly- altered from the DVD, gives the exact correct size. whether you are willing to stretch/squish it slightly in aid of improving picture quality by a few percents is merely a matter of perception, as well as whether the 144 or 128 heights look best to you. if you can spare the time do it 3 ways and test

For PAL formats, take your result but between the first reduction, and applying to 8 / 16 pixel borders, multiply by 1.2 (six fifths) for compensate for the 288 height. (interestingly, though 288 is a perfectly fine 9x32, 240 is 32x7.5... 32x8 is 256, which would still be a legal size for ntsc, so why...?)

For 16:9 and the uncommon (but existant) 14:9 variation*, more alterations need to be added. as 16:9 sets will stretch the picture horizontally in widescreen mode (and both 16:9 and 4:3 (12:9!) in intermediate 14:9 mode), you need to compensate by stretching vertically at the encoder stage. The maths are simple enough. At the same point as for PAL conversion, simply add a multiplication of 4/3 (4:3->16:9) or 7/6 (4:3->14:9). It may not be possible to make this work fully with fullscreen material into widescreen or 14:9 into 16:9, but with many things you can crop -some- pixels off the top and bottom to fit, maybe squash the picture innoticably too.
* - for such was 14:9 broadcasts invented (generally used by the bbc and few others ), so that the picture is fullscreen on both types of set, but appears generally OK to the casual observer, althogh those of keen eye will notice people being fatter than normal on a widescreen tv and thinner on a 4:3 - more intelligent sets can manually/automatically zoom this, eg with borders on a standard or small sideboxing on widescreen. can be a pain in the ass when an old set has trouble with it ie unwanted borders and that mysterious half-line at the bottom of the picture, but generally a pretty decent idea.
Some films are also bizarrely in this format, including reservoir dogs last time i checked.

blah blah blah. more tomorow.

[puertorican138]

Since your source is from a DivX, make sure you select 1:1 (VGA) for the Source aspect ratio as DivX is always 1:1 (VGA). Your output file should look just like the source (DivX). :P

[JamesB69]

ok the original is 640x272 or a aspect ratio of 2.35:1 so eddyH 352/144or136or128or whatever else you said is not very close to 2.35. 352x150 with selecting center custom size option will be the closest to 2.35 thus matching the original aspect ratio with black borders at the top and bottom

[energy80s]

So the best bet for doing DivX 640x272 as an NTSC VCD is 352x144 centered custom size. Damn useful info for all the Oscar Awards DVD screeners doing the rounds at present!!