Qiniu cloud asynchronous processing failed

Why does api. qiniu. comstatusgetprefop fail? Id5516810e7823de4068c5f0d8 appears {code...} curl access {code...} Why does it fail?
Http://api.qiniu.com/status/get/prefop? Id = 5516810e7823de4068c5f0d8
Appears

{    "code": 3,    "desc": "The fop is failed",    "id": "5516810e7823de4068c5f0d8",    "inputBucket": "xushubai",    "inputKey": "Recipe/bd217d108d2c5a6be2f87a2466d1df03.mp4",    "items": [        {            "cmd": "xushubai.qiniudn.com/Recipe/bd217d108d2c5a6be2f87a2466d1df03.mp4?ab/1200k",            "code": 3,            "desc": "The fop is failed",            "error": "execute fop cmd failed: unsupported cmd "        }    ],    "pipeline": "0.default",    "reqid": "default.bhsAADKZtg8qos8T"}

Curl

curl -i -d "bucket=xushubai&key=Recipe/bd217d108d2c5a6be2f87a2466d1df03.mp4&fops=xushubai.qiniudn.com/Recipe/bd217d108d2c5a6be2f87a2466d1df03.mp4?ab/1200k&notifyURL=http://m.ideer.cn/api.php/Api/Public/sharingTopRanking" -H "Content-Type: application/x-www-form-urlencoded" -H "Authorization: QBox 9FMaTxskZVYmm1LQBucZpZdExa2Zvz7q-5y0x7t7:CeGwt84LxUTiaieN1g6V7JgKFPg=" "http://api.qiniu.com/pfop/

Reply content:

Why?
Http://api.qiniu.com/status/get/prefop? Id = 5516810e7823de4068c5f0d8
Appears

{    "code": 3,    "desc": "The fop is failed",    "id": "5516810e7823de4068c5f0d8",    "inputBucket": "xushubai",    "inputKey": "Recipe/bd217d108d2c5a6be2f87a2466d1df03.mp4",    "items": [        {            "cmd": "xushubai.qiniudn.com/Recipe/bd217d108d2c5a6be2f87a2466d1df03.mp4?ab/1200k",            "code": 3,            "desc": "The fop is failed",            "error": "execute fop cmd failed: unsupported cmd "        }    ],    "pipeline": "0.default",    "reqid": "default.bhsAADKZtg8qos8T"}

Curl

curl -i -d "bucket=xushubai&key=Recipe/bd217d108d2c5a6be2f87a2466d1df03.mp4&fops=xushubai.qiniudn.com/Recipe/bd217d108d2c5a6be2f87a2466d1df03.mp4?ab/1200k&notifyURL=http://m.ideer.cn/api.php/Api/Public/sharingTopRanking" -H "Content-Type: application/x-www-form-urlencoded" -H "Authorization: QBox 9FMaTxskZVYmm1LQBucZpZdExa2Zvz7q-5y0x7t7:CeGwt84LxUTiaieN1g6V7JgKFPg=" "http://api.qiniu.com/pfop/

Resource processing commands are incorrect.fopsOperationfops=avthumb/mp4/ab/1200kAnd then re-sign and try again should be no problem, audio and video processing parameters can refer to the specific http://developer.qiniu.com/docs/v6/api/reference/fop/av/avthumb.html.