mergePolicy
A policy that determines how Elastic Transcoder handles the existence of multiple album artwork files.
Replace:
The specified album art replaces any existing album art.Prepend:
The specified album art is placed in front of any existing album art.Append:
The specified album art is placed after any existing album art.Fallback:
If the original input file contains artwork, Elastic Transcoder uses that artwork for the output. If the original input does not contain artwork, Elastic Transcoder uses the specified album art file.