Make a DVD-Video without destroy the original size..

milkmandan · Post by **milkmandan** » Sun Sep 25, 2005 2:40 am

use avisynth to add the 64 pixels worth of borders...

to resize either use your video editing program (adobe premiere) or virtualdubmod (dont know if VDM will work)

use nero smart start to encode to MPEG-2, just do normal 4:3,

btw, i haven't tried this myself..

but if you have a 608x336 video, how do you know to "resize your video to 640x352"? is 640x352 a standard out there? much like 640x480?

and after adding the black borders, why resiz to 720x480, wouldn't that stretch your video? cuz 480/640 = .75 3/4 = .75 but 480/720 = .6666

i am confused ><

Scintilla · Post by **Scintilla** » Sun Sep 25, 2005 3:00 am

milkmandan wrote:but if you have a 608x336 video, how do you know to "resize your video to 640x352"?

That was what my little calculations were for. You want to keep the aspect ratio the same, so you have the equation:

336/608 = X/640.

Solving for X yields approximately 354.

But 354 isn't a multiple of 16, so to make the encoder happy (keeping the image macroblocks completely separate from the black border macroblocks makes things easier to encode), we use a height of 352 instead.

milkmandan wrote:and after adding the black borders, why resiz to 720x480, wouldn't that stretch your video? cuz 480/640 = .75 3/4 = .75 but 480/720 = .6666

Yes. That's why MPEG-1 and MPEG-2 have the 4:3 aspect ratio flag option, so that it'll play back correctly.

I admit I don't know if NTSC DVDs can store video at resolutions other than 720x480 (I've never exactly looked up the DVD specifications); every NTSC DVD I've seen has used that resolution.

Shinodude · Post by **Shinodude** » Sun Sep 25, 2005 3:15 am

lol this all sounds so confusing but mabey michele should try start smart an defintly try what scintilla said hes usally the only person that acouly tells me the correct thing to do when im havin trouble an i post it lol but i dont quit understand the problem what im think is that when you put it onto a disk it comes out looking wierd mabey its the program your using to burn it to the disk(mabey its sizing it an doing somthing wierd when you brun it) i use nero same as rurounikeitaro uses an i havnt had a problem

trythil · Post by **trythil** » Sun Sep 25, 2005 3:18 am

Scintilla wrote: I admit I don't know if NTSC DVDs can store video at resolutions other than 720x480 (I've never exactly looked up the DVD specifications); every NTSC DVD I've seen has used that resolution.

704x480, 352x480, and 352x240 are also acceptable resolutions for MPEG-2 DVD-spec video.

The reason why nearly every NTSC DVD uses 720x480 is because of the relationship between (1) the sampling rate of a television signal, (2) the number of vertical scanlines / actually usable scanlines in a picture, and (3) mod16 resolutions work best with MPEG-2 macroblock structures. See http://www.uwasa.fi/~f76998/video/conversion/ , section 2.1.