# Blender Video Editing Output differs from Preview

I try to make a short movie clip using Blender's video sequence editor. I'm using 6 different clips which I want to put together using transitions. The clips are distributed around 4 different channels/tracks.

I'm using Blender 2.72b on Linux with all ffmpeg codecs and everything installed.

My problem is:

All looks excactly as I want it to in the preview on the upper right, but the rendered video is completely different.

Some (not all) Gamma Cross transitions are simply black and the some of the single clips are too long although I've cut and deleted the unwanted parts.

All these wrong/broken transitions and cuts work if I only render the transition plus minus 10 frames or something. So only the whole video together is broken, but consisting of working parts.

This is what it looks like in the Blender preview

This is what I get as output

So the gamma cross transition is replaced by a much shorter gamma cross from black.

Don't wonder about different image sizes, this is only my incapability of making proper screenshots.

Can I force Blender to render the video exactly as in the preview window? Or does anyone have an idea what's going on?

Screenshot of the whole Blender Window

• Please at least put image(s) here to show the comparison. – Leon Cheung Nov 25 '14 at 10:53
It looks like a gamma issue. Make sure your Color Management is set up correctly. You can try to set your gamma value to 2.2 and make sure sRGB is the color space for the sequencer to display the preview in the right color space.