Changing resolution width

[andre477]

I have an avi file, I'm trying to change the resolution or width and height to that of a dvd. Right now, the resolution looks like a standard non widescreen tv, a tall square type. I want to change the resolution to the width and height of a standard U.S. dvd and still keep it in the avi format it's in so I can watch this in full screen and look like a dvd, the quality of the movie is good, just the resolution size is weird for me.

I don't really know the meaning of pal and ntsc; but from what I've read, it currently looks like pal format, I'm trying to change it to a ntsc resolution format(standard u.s. dvd). Thanks.

[manono]

Hi-

Sorry to be blunt, but you're not making any sense at all. What are the specs of this AVI? Check it in GSpot and report on the resolution and framerate. An AVI made from a PAL DVD is usually 25fps and an AVI made from an NTSC DVD is usually either 23.976fps or 29.97fps. And maybe be more clear about what you want to do.

Are you saying that you want to make this AVI widescreen so that it will fill a widescreen TV set without having black bars on the sides? If that's the case, do you realize that this will mean cutting quite a lot from both the top and bottom, thus destroying the Original Aspect Ratio? And if that's what you want, why on Earth would you want to do that? I hope I've misunderstood.

[mats.hogberg]

Better start with the full specs of what you have, and what you'd like to end up with.

/Mats

[thecoalman]

, I'm trying to change it to a ntsc resolution format(standard u.s. dvd). Thanks.

First the resolution must be within the DVD spec for your neck of the woods, look under the "What is" section, if it already falls within this spec you don't want to change it.

Second the aspect ratio can be either 4:3(full screen) or 16:9 (widescreen) no matter what the resolution is. In other words a 720x480(ntsc) will display as 4:3 or 16:9 dependant on how the disc was authored. The aspect is determined by a flag on the DVD, the dvd player or the software your using to view the video adjusts it to the correct aspect.

If your video already falls within the specs for your neck of the woods you only need to author it to whatever the aspect is you want. Be aware that if the video was meant to be played at full screen and you author it as widescreen everthing is going to looked vertically squished (e.g a basketball is going to take the shape of an egg) and vice versa. Additionally dependant on the DVD player or software you are using to view the video you can usually manually change the aspect.

[andre477]

Sorry, I knew I'd have a hard time explaining that. I checked the properties of the videos so I hope this can help.

I have a different movie file that is in the correct aspect ratio I normally watch a movie in and the ratio I'd like this one in. Similar to a dvd aspect ratio. Here's the properties of the other one:

Video Size: 640 x 272
Aspect Ratio: 2.35:1

And here's the avi that I want to change so the aspect ratio and video size are the same as the one above and still keeping it in the avi format it's in.

Video Size: 720 x 480
Aspect Ratio: 3:2

I hope this can help. thanks.

[redwudz]

Put it into VirtualDub and use the 'resize' filter. I doubt if you will be happy with the results, but give it a try. You can also letterbox the image there. You really can't convert it without trimming or padding or the resulting video will be stretched or shrunk incorrectly. You will also have to reencode it with this method, resulting in some quality loss.

[manono]

Ah, I did guess wrong about what you wanted to do.

In such cases, I'd open it in GKnot and crop and resize in there. You can also do the same thing in VDub(Mod). If using AviSynth, then GKnot gives me:

Crop(0,54,720,372)
LanczosResize(640,272)

That's with ITU resizing turned on, cropping 54 pixels of black from both the top and bottom, assuming it was originally 2.35:1 and 16:9. Each DVD is different. It may not be truly 2.35:1, and the black may be distributed differently on different DVDs. You can do similar things in VDub. Then encode, setting the codec, the 2 passes, and the bitrate which you can also get from GKnot. Set the audio for Direct Stream Copy so it doesn't get changed, or demux it and remux it later on. When figuring the bitrate, don't forget to allow for the size or bitrate of the audio, and muxing overhead. There are probably guides around here for what you want to do.