Reducing the size in MB by reducing in pixels...

[mirceagoia]

Hi,

I have an uncompressed AVI file with 720/480 pixels (16:9 format) of 1 Gb.
When I compress to MPEG-2 with TMPGenc with the same 720/480 pixels it will have 100 Mb.

Now, I want to reduce that 100 MB to somewhere around 15-20 Mb by reducing the size in pixels (let's say to have 449/256 pixels).

Althought I set these dimensions in TMPGenc in Other Settings->Size (I clicked on Unlock and then I put the dimensions I want) after encoding the size remained the same: 720/480 pixels!

It seems the only way to reduce the size is to reduce the bitrate...but this produces bad quality.

Can anyone give me an advice on how to reduce the size by reducing the dimensions in pixels of the movie?

I want to put it on internet and it's not necessary to have 720/480 pixels...

Thanks,
Mircea

[tigerman8u]

Video and audio bitrate and length of video determine the file size. To lower the bitrate and keep any kind of quality you have to lower the resolution as well. You could try 352x240 and lower the bitrate using the unlock method you used. Another option would be to consider using mpeg4 which allows you to use much less bitrate and maintain good quality.

[Bexley]

Unless you're planning to make an SVCD or DVD at some point, there isn't much reason to use MPEG-2. If the only use of this clip is going to be web posting, I would say use a simple AVISynth script for resizing/deinterlacing (if needed) and encode to an MPEG-4 codec like XVid. Your file size will typically be about half as much as MPEG-2 at comparable quality.