{
  "id": "audio-only/aac.m4a",
  "layer": 1,
  "files": [
    "aac.m4a"
  ],
  "size_bytes": 97743,
  "container": {
    "format": "mov,mp4,m4a,3gp,3g2,mj2",
    "duration_s": 6,
    "bit_rate": 130324,
    "top_level_boxes": [
      "ftyp",
      "moov",
      "free",
      "mdat"
    ],
    "moov_before_mdat": true
  },
  "audio": [
    {
      "codec": "aac",
      "profile": "LC",
      "sample_rate": 48000,
      "channels": 2,
      "channel_layout": "stereo",
      "language": "und"
    }
  ],
  "content": {
    "beep": "carrier with a 4x beep for 40 ms at the start of every second"
  },
  "expect": {
    "outcome": "must-play",
    "duration_s": 6,
    "duration_tol_s": 0.15,
    "beep_every_frames": null,
    "av_offset_ms": 0,
    "av_tol_ms": 20
  },
  "sha256": {
    "aac.m4a": "3f95a273cf56044f2d39a082e7fbbab358e71bdf8e6056a35e6b8a7d09bc73aa"
  },
  "verified_by": [
    "sample rate",
    "channels",
    "audio tracks",
    "duration",
    "layout",
    "ffmpeg decode",
    "gstreamer decode",
    "check beeps"
  ],
  "recipe": {
    "duration_s": 6,
    "audio": {
      "codec": "aac",
      "channels": 2,
      "rate": 48000
    },
    "container": {}
  }
}