First, thank you for a great plugin and working on it even you're not a full time developer (as you mentioned in the description), for sharing this with the community and your active support on it.
I installed ffmpeg and it's dependencies on my CentOS 5.4 using a guide here: http://cumulusclips.org/docs/install-ffmpeg-x264-on-centos/ (found it from one of the support thread in your plugin).
After installing, I finally saw the ffmpeg run in the command line when executing "/usr/local/bin/ffmpeg"
I checked the settings of the plugin and made sure I'm using the correct path. Done!
I proceed to create a new post and uploaded an mp4 file, I clicked Generate thumbnail and it presented 4 thumbnails. Then I clicked encode and it says "Encoding Mobile M4V. Encoding WEBM. Encoding OGV. (continues if window is closed)", since the status bar is not moving and nothing is happening I just clicked insert into post. I saw a code auto generated, saved the post and checked the output.
The output is just a post with blank page and a link to download the video file with label: "Right-click or ctrl-click this link to download.". Nothing else!
What am I missing?
Thanks in advance!