|"Will video editing help in this regard?"|
Not if there is no video data present in that file. What is the size of the file? How does the size compare to the other (working) video files? If the video data is missing, there will be a significant difference in the file sizes.
It could also be a case of not having the right codec installed. Without the right codec, converting the file will result in a file with no video data. If audio is playing, you obviously have the right audio codec installed. Download gSpot and check the video codec.
Please let us know if you found someone's advice to be helpful.