I am integrating Amazon s3 Elastic Transcoder using aws-sdk-php. I use http://elastictranscoding.blogspot.in/ link to accomplish my task. While implementing i face following
Verify your detail before you create job 'key','secret','region',
check pipeline region while you create pipeline, may be create job region is different, some time other region user not able connect via different region, double check require credential please make sure your pipeline region and create job region is must be same.