Amazon Elastic Transcoder · Schema
Artwork
The file to be used as album art. There can be multiple artworks associated with an audio file, to a maximum of 20.
To remove artwork or leave the artwork empty, you can either set Artwork to null, or set the Merge Policy to "Replace" and use an empty Artwork array.
To pass through existing artwork unchanged, set the Merge Policy to "Prepend", "Append", or "Fallback", and use an empty Artwork array.
Amazon Web ServicesAWSMediaTranscodingVideo