So I have an S3 bucket of videos (several hundred), upon which I used ElasticTranscoder to transcode everything into a second, optimised bucket.
However, when I inspect my second bucket, there are 40-50 less objects, but I cannot figure out what they are (the directory structure is deeply nested etc).
How can I get the file diff of two buckets using aws s3api list-objects?
Perhaps there are files in the bucket which are not videos, which I somehow didn't know about.
You can use the sync command with the --dryrun option to compare instead of syncing.
aws s3 sync s3://bucket s3://bucket2 --dryrun
You can, of course, also use it to compare a local directory with a bucket.
aws s3 sync . s3://bucket2 --dryrun
Inspired from @George comment
you can use this to extract paths list:
aws s3 sync s3://<main-bucket> s3://<second-bucket> --dryrun | awk 'match($3,"^(s3://[^/]+/)(.*)",a) {print a[2]}'
or for local paths
aws s3 sync <local-path> s3://darsak2.public --dryrun | awk 'match($3,"^(./)?(.*)",a) {print a[2]}'