The error message ECOM00122 translates to “Unknown format.”
This error could denote a few different issues:
1) Your source file may be corrupted. Please verify that your source has uploaded in its entirety.
2) Double check that your file is supported by encoding.com. It may be that it is not supported format. Check it against our source listing: http://www.encoding.com/wdocs/SourceFileFormats
3) The path to your source may not be valid. Be sure the source URL you specified is correct in path and syntax and that there are external references that could not be interpreted by our download engine.