Transcoding can fail due to many reason. Specially important are:
- transcoded file is bigger than original (not a technical transcoding fail but this transcoded file makes no sense to keep)
- transcoding was aborted tue to too long transcoding time
- other errors
The goal is to marke such transcodings as "with error" and show it in the transcoding listing to authors and administrators. When the transcoder has new options the user might want give the transcoding another try.