Reducing the size of divx files? (and converting mp4?)

[dmuk]

I have some divx files that are 700mb in size, which is a bit much.

I'd like to halve the size of each of the divx files, and change the AC3 sound to 128kbps mp3, which will hopefully not lose a lot of quality in the video.

How do I do this? Cheers

Also, I'd like to do the same with some other files, but they are in mp4 files...

[mats.hogberg]

AutoGK to lower bitrate DivX/XviD is the easy solution.
How long are your 700 mb files? (Timewise)

/Mats

[dmuk]

About 45 minutes each.

[mats.hogberg]

That could work, but beware that halving the file size (=halving the bitrate) essentially means halving the quality. 128 kbps mp3 should be OK, and may gain some sizewise (depending on AC3 bitrate)

/Mats

[dmuk]

I was hoping most of the file size would be reduced by changing AC3 to mp3

[guns1inger]

unless the AC3 is 448kbps, you won't get a lot of space back. What does g-spot say about your video and audio ?

[dmuk]

AGK works mostly, but not with mp4, any ideas? thanks.

[d-wil]

Install ffdshow and avisynth if you don't have them. Then make an avs file (just a text file with an avs extension) and type in it DirectShowSource("full directory of file")

Then try opening the avs file in AutoGK. If that doesn't work try regular GordianKnot