We were looking for a versatile #MediaTranscoding service for #video to convert TV shows and movies from large content providers into web #VideoStreaming formats. These content providers gave us files ranging from Apple ProRes to h.264, with file sizes from 1 GB to 100 GB, and we needed a tool that could cope with all of it. We looked at Amazon Elastic Transcoder and Zencoder, and eventually chose @Zencoder because it had support for every format we needed, good handling of sound channel remapping, and a clear UI with fast processing times. We automated our usage with it by writing a simple Python script to interact with it's API, and hosted the input and output AV files on Amazon S3, which it could easily talk to. So far we've converted 15 TB representing several thousand files using the service and are quite happy!
have you tried Wowza? We are using here to provide streaming from our cameras ( we process 13 TB/day).
We didn't look into Wowza extensively because we thought it was presented primarily as a live stream service. Do you use Wowza as a CDN as well? We ended up leveraging Amazon S3 and CloudFront.