Amazon S3 + CNAME + Zencoder

I'm using Amazon S3 to store my video files. The files on the bucket are kept private, and access is granted through bucket policies.

Everything was working fine, until I decided to use a CNAME for the bucket (bucketname -> bucketname.s3.amazonaws.com). I enabled CNAME on the AmazonS3 module, but then Zencoder jobs report that the original video file could not be downloaded, due to an HTTP 403 response.

According to Zencoder docs (https://app.zencoder.com/docs/guides/getting-started/working-with-s3): "When using a bucket policy you should always use URLs in the s3://BUCKET/KEY format so that Zencoder is sure to identify them as S3 URLs and sign the request appropriately."

Also, if the URL contains "s3.amazonaws.com", Zencoder identifies it is a S3 bucket, and send the appropriate identity (that's why it worked before the CNAME). But now the URL is something like http://bucketname/video/test.mov, and Zencoder doesn't recognize it as a bucket anymore.

To workaround this, I modified the TranscoderAbstractionFactoryZencoder.setInput() method to change the protocol of the URL, from http:// to s3://, and now things are working again. Zencoder receives a URL like s3://bucketname/video/test.mov, transforms it to http://bucketname.s3.amazonaws.com/video/test.mov, sends the authetication data and the job succeeds.