MPEGed

MPEGed is a handy and easy to use application that enables you to find errors in the aspect ratio headers of MPEG videos. Delivered inside a lightweight package, this application works with MPG, MPEG and M1V files, enabling you to fix incorrect header properties of your videos.
The application features an intuitive layout of the interface, which makes it very easy to work with. In order to ignore certain file types and only look for MPEG videos, you can enter the desired file types to look for within the designated area of MPEGed.
You start by selecting the directory to search in and MPEGed will display all the files it finds, considering the filtering settings you configured. Matching files are displayed in a different pane, enabling you to analyze each of the videos individually.
MPEGed scans each video file for a valid header within the first 65332 bytes, displaying all the identified errors.
Using the Property Editor section, you can change the video resolution and the playback rate, as well as change the fullscreen aspect ratio. MPEGed can match the aspect ratio with the video resolution and suggest a specific value for you to select (PAL, NTSC).
What MPEGed actually does is scan a whole folder for MPEG files and verify the aspect ratio header for each, giving you the freedom to modify the header properties without making a compromise on quality. It definitely takes less time to modify the video properties with MPEGed, rather than re-encoding it.