Comment 8 for bug 660807

I am running Ubuntu 10.10, and ran into this exact problem. In editing mode, I can insert a video into a slide and Impress displays a frame from the video. Using Tools->Media Player, the video opens and plays correctly. When in presentation mode, the video is simply a gray square.

After reading the above post, I checked the href path of the inserted video file. It displays as "href=media/Video.mpg". The video is present in the media folder inside the ODP archive. Manually modifying the href path to the full path of the video file does allow the video to play in presentation mode. After opening the modified presentation, Impress asks if media paths should be updated. Selecting "yes" modifies the href path to "href=../Video.mpg". Again, the video plays correctly in presentation mode. So, it seems the issue is related to Impress not finding the video in its own archive.

On a possibly related note, deleting the video from the Impress presentation does not seem to remove it from the the Impress media folder. This causes the ODP file size to increase drastically as you modify the presentation over time.