How to change picture size

[hilario]

Hi all:

I have an avi movie whose original picture is 512x384.
I would like to change it to something like : 640x272 or similar.
what's the best way to do it ??
And what's the best tool for doing that ??

[jagabo]

If it's Divx or Xvid use MPEG4Modifier to change the DAR. This will not involve any reencoding, it just tells the player what aspect ratio to display the video at. Unfortunately, not all players support the DAR flag.

I you have to resize the "best" tools are Avisynth + VirtualDub. AviSynth for resizing and any other processing (deblocking? deringing?) and VirtualDub to feed your chosen encoder.

[DarrellS]

512x384 is 4:3 or 1.33:1 aspect ratio. Changing to 640x272 would be changing to a wrong aspect ratio (24:10 or 2.35:1).

Changing the resolution in Virtualdub would mean re-encoding the file which has already had the quality degraded and increasing the resolution is always worse than decreasing. A small resolution file with decent bitrate is better than large resolution file with the same bitrate and increasing the bitrate will not give the larger resolution file any more quality.

I would leave the file as it is.

[Midzuki]

512x384 is 4:3 or 1.33:1 aspect ratio.
Changing to 640x272 would be changing to a wrong aspect ratio (24:10 or 2.35:1).

Sadly there is nothing that can stop an incompetent releaser from
converting a widescreen video to a 4:3~framesized AVI.
For example:

[jagabo]

512x384 is 4:3 or 1.33:1 aspect ratio.
Changing to 640x272 would be changing to a wrong aspect ratio (24:10 or 2.35:1).

Sadly there is nothing that can stop an incompetent releaser from
converting a widescreen video to a 4:3~framesized AVI. :( :( :(

Yeah, that's what I assumed the OP wanted to fix.

[DarrellS]

My bad. I assumed he wanted to make a 4:3 movie fit on a wide screen TV.

[hilario]

So guys, if I understood right, there's nothing I can do.

Or should I say, I can but movie will loose quality ??

However it's possible to change picture size using virtualdub.

Can you please be more specific and tell me how ??

tks.

[Baldrick]

In Virtualdub(or virtualdubmod),
Video->Filters add the resize filter and change resolution
Video->Compression and choose a video compression like Divx Codec or Xvid Codec.
Audio->Direct Stream Copy
File->Save as a new avi

[poisondeathray]

Just a suggestion-

You don't have to permanantly re-encode if just viewing this on your PC, by using a software player like MPC you can select options like override aspect ratio settings, strech to fit, resize etc...

[hilario]

Yes Baldrick, I managed to find out how to do it with virtualdub.Tks.

Regarding poisondeathray sugestion I know that I can do it using the media player controls.
Thanks to all of you for yr sugestions.

[DarrellS]

The resize filter in Virtualdub 1.8.0 is much better than the one in VirtualdubMod. Matter of fact, the whole Virtualdub 1.8.0 program is better than VirtualdubMod. The newest version of VirtualdubMod is over two years old and will never be updated again. Virtualdub gets updated constantly with all kinds of great features.

[Matsuemon]

Hey guys, I have a similar issue with wanting to resize a video. It's great quality, but the pic is to narrow (height), especially with subtitles in there, so I just want to make the whole thing bigger without screwing up the balance/ quality too much. Here are the specs of the video I'm trying to resize:

AVI, 2210 Kbps, 544/ 224, 24 Fps. I've tried like five different resizes but it just looks strange. Maybe the program I'm using (Anyvideoconverter) just doesn't give me the right options to make it look natural. Seems like a very good program, though. TONS of options.

Anyway, thanks guys!

[Midzuki]

A screenshot of the damn AVI would be helpful
(as long as it does not violate the forum rules, of course) 8)

[Matsuemon]

A screenshot of the damn AVI would be helpful
(as long as it does not violate the forum rules, of course) 8)

Umm, why are you cussing at me? I'll check the rules to see if I can post a pic.

[Midzuki]

I was not cussing at Matsuemon-sama.
Remember, sense-of-humour is a thing that must remain turned-on 24x7!

Before you reply, please observe our following forum rules
# Do NOT give, link, ask, or advocate WAREZ.
# Warez includes downloaded copyrighted movies and TV-series/shows and copying rented movies.

[Matsuemon]

[quote="Midzuki"]I was not cussing at Matsuemon-sama.
Remember, sense-of-humour is a thing that must remain turned-on 24x7!

Haha sorry. On these forums you never know. Some people really aren't nice. Gomen nasai =P

Wow, I used VirtualDubMod to resize it, but WITHOUT the resize filter, and it looks GREAT. The resize filter made the output quality quite poor, but when I resized it in the video compression section, it worked perfectly and looks awesome.

[jagabo]

You are talking about two different things. You seem to want to change the files size (more compression to make a smaller file?). The resize filter in VirtualDub changes the frame size. For changing the frame size I recommend you use the Lanczos3 method most of the time.

[Matsuemon]

You are talking about two different things. You seem to want to change the files size (more compression to make a smaller file?). The resize filter in VirtualDub changes the frame size. For changing the frame size I recommend you use the Lanczos3 method most of the time.

No no, I was only talking about changing the actual physical dimensions of the movie itself, not the file size. But when I used the resize filter, the quality was horible, even at the highest setting. So I just changed it in the compression section (video, then resize), which you would think would only affect file size, but it also changed the dimensions of the frame, which is what I was after. Anyway, it looks great.

[jagabo]

You must have done something wrong with VirtualDubMod's resizing because its resizers are pretty good. The default is Nearest Neighbor which is only useful for some special purposes. It sounds like you used Divx's resizing (I don't know of any other codec that has resizing built-in). Its Lanczos4 method (similar to VirtualDubMod's Lanczos3) is very sharp without adding too much moire artifacting.

Did you try using MPEG4Modifier to change the DAR? It that works for your player that may be the best solution since it doesn't involve any reencoding.