There are plugins for VD like FLVInput and Quicktime vdplugins. Try to search themAlso you can always use DirectShowSource() through AviSynth in VD
DO NOT USE CODECPACKS! Their only purpose is to screw up your system and make you miserable. If you’ve already installed one, better leave it be. Uninstalling is potentially even more dangerous than installing.As 2E7AH said, get the input plugins for FLV and MP4. You also might need to get ACM/VfW decoders for the audio/video streams inside them. FFDShow is a great solution for the video part. Just make sure to enable H.264 in its VfW decoder config.You might also want to try Avidemux as an alternative. It works a lot like VDub but has native support for modern media formats.
@francesco: it seems that the best for you would be using Avidemux, although even then you need to know something about filters/codecs/containers etcquicktime vdplugin is the name of the plugin that could help you open mp4 files in VDdon't bother with AviSynth
[b]mediainfo video.mpg[/b] GeneralComplete name : video.mpgFormat : MPEG-PSFile size : 13.5 MiBDuration : 21s 600msOverall bit rate : 5 261 KbpsVideoID : 224 (0xE0)Format : MPEG VideoFormat version : Version 2Format profile : Main@MainFormat settings, Matrix : DefaultDuration : 21s 600msBit rate mode : VariableBit rate : 4 668 KbpsNominal bit rate : 6 200 KbpsWidth : 720 pixelsHeight : 576 pixelsDisplay aspect ratio : 4:3Frame rate : 25.000 fpsStandard : PALColorimetry : 4:2:0Scan type : InterlacedScan order : Top Field FirstBits/(Pixel*Frame) : 0.450Stream size : 12.0 MiB (89%)AudioID : 192 (0xC0)Format : MPEG AudioFormat version : Version 1Format profile : Layer 2Duration : 21s 600msBit rate mode : ConstantBit rate : 384 KbpsChannel(s) : 2 channelsSampling rate : 48.0 KHzResolution : 16 bitsStream size : 1 012 KiB (7%)