Did you ever record video that you wanted to rotate? Have you ever rotated a clip and you were left with extra space on the side you wanted to crop out? I recently worked on a project where we had to rotate video clips and crop out the extra space. The tool we used on the Mac was MPEG Streamclip (http://www.squared5.com/). It is a free video conversion software. Here’s how to rotate the clip and crop it in MPEG Streamclip.
1. Open MPEG Streamclip and drop your video into the application. You will see a preview of your video.
2. Go to File—>Export to MPEG4 (you can choose other options depending on the format you want to save the video).
3. In the Exporter window, choose rotate 90 degrees CCW. (This may change depending on how you want to rotate the video).
4. For your zoom (under rotation) choose 75%. If you do not change this, part of the video will be cut off. 
5. Depending on how big your video will be, you may have some extra black space after the rotation you may want to crop. To do this, check the checkbox next to Cropping. For Left and Right values, type in the pixel value you want to crop. For 640px width, 140px for left and right worked for me.To see if this cropping is correct, click the Preview button at the bottom left before you render the whole video.
6. Once you have cropped the video and previewed it, click on the Make MP4 button.
7. Decide where you want to save the file on your computer and click Save. The exporting process will start. It may take a few minutes depending how large and long your video clip is.
