Speed Up or Slow Down the Playback of a Video with AWS MediaConvert

Hello,

I have a Video with the duration of 15 seconds and want to transcode it and speed it up to 10 seconds. My SourceVideo has a frame-rate of 25fps. I tried to slow it down by changing the frame-rate of the output video to 37.5fps, but this results in a 15 seconds long video with the frame-rate 37.5. Is there any mistake in the job or is there another opportunity to slow down or speed up a video in MediaConvert?

Here is my sample Jobs:

{
  "UserMetadata": {},
  "Settings": {
    "TimecodeConfig": {
      "Source": "ZEROBASED"
    },
    "OutputGroups": [
      {
        "CustomName": "Sample_SlowDown",
        "Name": "File Group",
        "Outputs": [
          {
            "ContainerSettings": {
              "Container": "MP4",
              "Mp4Settings": {}
            },
            "VideoDescription": {
              "CodecSettings": {
                "Codec": "H_264",
                "H264Settings": {
                  "FramerateDenominator": 1000,
                  "MaxBitrate": 500000,
                  "FramerateControl": "SPECIFIED",
                  "RateControlMode": "QVBR",
                  "FramerateNumerator": 37500,
                  "SceneChangeDetect": "TRANSITION_DETECTION",
                  "FramerateConversionAlgorithm": "FRAMEFORMER"
                }
              }
            },
            "Extension": "mp4",
            "NameModifier": "test_1"
          }
        ],
        "OutputGroupSettings": {
          "Type": "FILE_GROUP_SETTINGS",
          "FileGroupSettings": {
            "Destination": "s3://"
          }
        }
      }
    ],
    "FollowSource": 1,
    "Inputs": [
      {
        "AudioSelectors": {
          "Audio Selector 1": {
            "DefaultSelection": "DEFAULT"
          }
        },
        "VideoSelector": {},
        "TimecodeSource": "ZEROBASED",
        "FileInput": "s3://"
      }
    ]
  },
  "BillingTagsSource": "JOB",
  "AccelerationSettings": {
    "Mode": "DISABLED"
  },
  "StatusUpdateInterval": "SECONDS_60",
  "Priority": 0
}

Regards, Benjamin