My error message was folloinwngs.:
ERR: exception ‘Exception’ with message ‘Couldn’t delete file [/content/entry/data/0/0/0_xxxxxxxx.mp4] from bucket [yyyyyy]: The authorization header is malformed; the region ‘us-east-1’ is wrong; expecting ‘ap-northeast-1’’ in /opt/kaltura/app/infra/log/KalturaLog.php:83
then i just update following file to set $s3Region and it is working now.
/opt/kaltura/app/infra/storage/file_transfer_managers/s3Mgr.class.php
protected $s3Region = ‘ap-northeast-1’;
I test with the latest version of Kaltura which is 13:20