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• Audio/video out of sync after Google Cloud Transcoding

  18 mai 2021, par Renov Jung

  I have been using Google Cloud Transcoding to convert video into HLS.
There are only few videos out of audio sync after the transcoding.
The Audio is behind +1 2 seconds.
The jobConfig looks no problem to me. So, I have no idea how to solve it or even what is causing the trouble from jobConfig setting.

  


  jobConfig :

  


  job: {
    inputUri: 'gs://' + BUCKET_NAME + '/' + inputPath,
    outputUri: 'gs://' + BUCKET_NAME + '/videos/' + outputName + '/',
    templateId: 'preset/web-hd',
    config: {
      elementaryStreams: [
        {
          key: 'video-stream0',
          videoStream: {
            codec: 'h264',
            widthPixels: 360,
            bitrateBps: 1000000,
            frameRate: 60,
          },
        },
        {
          key: 'video-stream1',
          videoStream: {
            codec: 'h264',
            widthPixels: 720,
            bitrateBps: 2000000,
            frameRate: 60,
          },
        },
        {
          key: 'audio-stream0',
          audioStream: {
            codec: 'aac',
            bitrateBps: 64000,
          },
        },
      ],
      muxStreams: [
        {
          key: 'hls_540p',
          container: 'ts',
          segmentSettings: {
            "individualSegments": true
          },
          elementaryStreams: ['video-stream0', 'audio-stream0'],
        },
         {
           key: 'hls2_720p',
           container: 'ts',
           segmentSettings: {
             "individualSegments": true
           },
           elementaryStreams: ['video-stream1', 'audio-stream0'],
         },
      ],
      manifests: [
        {
          "type": "HLS",
          "muxStreams": [
            "hls_540p", "hls2_720p"
          ]
        },
      ],
    },
  },


  


  Before transcoding video :

  


  

  • https://storage.googleapis.com/greyd/video/1621244451071_7aa8b5358afe8c5690e3bf8e67c69a52.mp4

  


  


  After transcoding video :

  


  

  • https://storage.googleapis.com/greyd/videos/60a23a2a1fd9a72f9d721cef/manifest.m3u8

  


  


• ffmpeg alters color scheme when converting images to a video

  12 février 2019, par Flo Ryan

  I am trying to convert a sequence of png images to a video. Unfortunately the video though playing exactly what i want alters the colors.

  The command used to convert the images :

  ffmpeg -framerate 30 -pattern_type glob -i ’*.png’ -c:v libx264 -profile:v high -crf 20 -pix_fmt yuv420p out.mp4

  The original image colors :
  

  The colors as displayed in the video.

  

  How can I circumvent this altering of the colors ?

  EDIT
  I found the answer as posted below.

• Create hls stream in Google Cloud Functions (ffmpeg)

  3 novembre 2018, par Markus

  I tried for several hours with no good outcome.

  I want to create an hls stream (from a mp4 video) with the help of google cloud functions.

  This is what i have come up with so far :

    const remoteReadStream = myBucket.file(vidPath).createReadStream();
  
    const remoteWriteStream = myBucket.file(vidPath.replace('.mp4', '.m3u8')).createWriteStream();
  
  
  
  
  
    var proc = ffmpeg()
  
      .input(remoteReadStream)
  
    // Base url
  
    // include all the segments in the list
  
    .addOption('-hls_time',4)
  
    .addOption('-c:a aac')
  
    .addOption('-ar 48000')
  
    .addOption('-c:v h264')
  
    .addOption('-profile:v main')
  
    .addOption('-crf 20')
  
    .addOption('-sc_threshold 0')
  
    .addOption('-g 48')
  
    .addOption('-keyint_min 48')
  
    .addOption('-hls_playlist_type vod')
  
    .addOption('-b:v 800k')
  
    .addOption('-maxrate 856k')
  
    .addOption('-bufsize 1200k')   
  
    .addOption('-b:a 96k')
  
    .addOption('-hls_segment_filename', 'this_is_not_working_%03d.ts') 
  
                *tried gs://.../videos/$03d.ts' as well as other paths...
  
    .outputOptions('-f hls')
  
    .on('progress', function(progress) {
  
  
  
      var processing_str = 'Processing:' + progress.percent + '% done';
  
      console.log(processing_str);
  
    })
  
    .on('end', function() {
  
      console.log('file has been ffmpeg succesfully');
  
    })
  
    .on('error', (err, stdout, stderr) => {
  
        console.error('An error occured during encoding', err.message);
  
        console.error('stdout:', stdout);
  
        console.error('stderr:', stderr);
  
      })
  
    .pipe(remoteWriteStream, { end: true });

  This will give me the m3u8 file but the header files (ts files) will not be created, cause of the failure of saving them. The m3u8 file is saved, because it is a stream.

  Opening ’xxx.ts’ for writing Could not write header for output file #0 (incorrect codec parameters ?)

  I want to save them in the same folder, but I cannot access it by the bucket.
  Does anyone know, how to ’create’ multiple files (give the excact path of my bucket) in the ffmpeg configuration ?

  Maybe saving them as a stream would be the answer, but i have no clue how to pass that stream (.createWriteStream() ;) as an argument.

  Thanks in advance