Amazon Elastic Transcoder is described as 'is media transcoding in the cloud' and is an website in the File Management category. There are six alternatives to Amazon Elastic Transcoder, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Ruby, Python and .NET Framework. The best alternative is Coconut, which is free. Other great sites and apps similar to Amazon Elastic Transcoder are Transloadit (Freemium), Snickers (Free, Open Source), MediaMachine (Freemium) and Zencoder (Paid).
Snickers is an open source alternative to the existent cloud encoding services. It is a HTTP API that encode videos. It supports the download of sources from HTTP and Amazon S3, encode them in H264/MP4 or VP8/WebM using a FFmpeg binding and uploads the results to Amazon S3.
File+ is a dedicated file management and file conversion API for online files and media. File+ provides an engine that allows large scale online file storage as well as the mapping of input files to series of commands for producing file conversion.