GCP Transcoder API mov/mp4 to hls/fmp4 no audio output (on IOS)

Question

I use the GCP Transcoder API with the following configuration:

NodeJS 12
Firebase Storage
Firestore DB
GCP CDN

job start on upload (firebase function)

  const config = {
    "elementaryStreams": [
      {
        "videoStream": {
          "codec": "h264",
          "tune": 'zerolatency',
          "preset": 'superfast',
          "heightPixels": 360,
          "widthPixels": 640,
          "bitrateBps": 400000,
          "rateControlMode": "vbr",
          "frameRate": 30,
          "crfLevel": 26,
          "gopMode": { "gopDuration": "1.0s",  }
        },
        "key": "video-stream0"
      },
      {
        "videoStream": {
          "codec": "h264",
          "tune": 'zerolatency',
          "preset": 'superfast',
          "heightPixels": 480,
          "widthPixels": 854,
          "bitrateBps": 1500000,
          "rateControlMode": "vbr",
          "frameRate": 60,
          "crfLevel": 26,
          "gopMode": { "gopDuration": "1.0s",  }
        },
        "key": "video-stream1"
      },
      {
        "videoStream": {
          "codec": "h264",
          "tune": 'zerolatency',
          "preset": 'superfast',
          "heightPixels": 720,
          "widthPixels": 1280,
          "bitrateBps": 3000000,
          "rateControlMode": "vbr",
          "frameRate": 60,
          "crfLevel": 26,
          "gopMode": { "gopDuration": "1.0s",  }
        },
        "key": "video-stream2"
      },
      {
        "key": "audio-stream0",
        "audioStream":  {
          "codec":  "aac",
          "bitrateBps":  128000,
          "channelCount": 2,
          "channelLayout": ["fl", "fr"],
          "sampleRateHertz": 48000,
        }
      }
    ],
    "muxStreams": [
      {
        "key": "video-only-sd",
        "container": "fmp4",
        "elementaryStreams": [ "video-stream0" ],
        "segmentSettings": { 
          "segmentDuration": { "seconds": "2.0s" },
          "individualSegments": true 
        },
      },
      {
        "key": "video-only-md",
        "container": "fmp4",
        "elementaryStreams": [ "video-stream1" ],
        "segmentSettings": { 
          "segmentDuration": { "seconds": "2.0s" },
          "individualSegments": true 
        },
      },
      {
        "key": "video-only-hd",
        "container": "fmp4",
        "elementaryStreams": [ "video-stream2" ],
        "segmentSettings": { 
          "segmentDuration": { "seconds": "2.0s" },
          "individualSegments": true 
        },
      },
      {
        "key": "audio-only",
        "container": "fmp4",
        "elementaryStreams": [ "audio-stream0" ],
        "segmentSettings": { 
          "segmentDuration": { "seconds": "2.0s" },
          "individualSegments": true 
        }
      }
    ],
    "manifests": [
      {
        "fileName": "master.m3u8",
        "type": "HLS",
        "muxStreams": [
          "video-only-sd",
          "video-only-md",
          "video-only-hd",
          "audio-only"
        ]
      }
    ],

Excerpt of the output:

The videos run wonderfully on various players, also adapt to the bandwidth, but the sound is missing on iPhones. Possible reason: The audio files were generated, but the number differs from the generated video files. At about 10 sec. video, there is one more audio file.

Any idea what I have forgotten or overlooked or wrongly defined or interpreted?

GCP Transcoder API mov/mp4 to hls/fmp4 no audio output (on IOS)

0 Answers0