Video clips will not play/can be added in Sony Vegas pro 9.0

[NeoQuixotic]

The settings depend upon what you need to encode/decode. Here's the description of the settings for lagarith from the avtech guide.

Enable Null Frames: This option will increase compression when you have special content that contains completely static scenes, but the output it produces can be problematic to edit with, so it is not recommended for stability reasons.

Always Suggest RGB Format for Output: This is a decoding option that will cause Lagarith to decode video in RGB unless a program explicitly tells it otherwise. If your video appears black or you get a similarly strange error, it is recommended that you enable this. I leave this enabled all the time, and you probably should, too.

Use Multithreading: If you have a multi-core processor, you should select this. Otherwise, leave it disabled.

Prevent Upsampling When Decoding: Checking this option and having the mode set to RGB or RGBA will prevent Lagarith from performing any colorspace conversions when encoding or decoding video.

Mode: This may be confusing if you don't understand what this setting does. This sets the highest colorspace that Lagarith can encode to, not the colorspace that will be used. This means that if its set to RGB, and you feed YV12 video into Lagarith, it will still be encoded as YV12. However if you set this mode to YV12, and you feed RGB32 footage into lagarith, the video will be down-converted to YV12. What this basically means is this: If you want to encode in YV12 colorspace (as you almost surely will want to do), its fine to set this to YV12, and you will definately get YV12 compressed video.