Videos with multiple audio tracks / multi-track audio

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Ravi Ramphal

• August 03, 2020 20:53

It seems that if you upload a video with multiple audio tracks, Cloudinary only picks one. Is there a way to downmix all audio tracks or to choose which audio track is delivered?

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  Francis Tagbo

  • August 04, 2020 10:20

  Hi Ravi,

  Currently, we don't support such options.

  If you could share the video and elaborate more on the use-case, we can check if we can have a workaround.

  Thanks,

  Francis

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  Ravi Ramphal

  • August 04, 2020 20:51

  Hey Francis,

  Unfortunately, I can't really share the video itself publicly, I can share some example metadata:

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'multi-track-example.mov':
    Metadata:
      major_brand : qt
      minor_version : 0
      compatible_brands: qt
      creation_time : 2020-07-31T20:46:42.000000Z
    Duration: 00:00:05.00, start: 0.000000, bitrate: 12013 kb/s
      Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, bt709/bt709/iec61966-2-1), 750x1334, 10028 kb/s, 28.26 fps, 30 tbr, 600 tbn, 600 tbc (default)
      Metadata:
        rotate : 270
        creation_time : 2020-07-31T20:46:43.000000Z
        handler_name : Core Media Video
        encoder : HEVC
      Side data:
        displaymatrix: rotation of 90.00 degrees
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 248 kb/s (default)
        Metadata:
          creation_time : 2020-07-31T20:46:43.000000Z
          handler_name : Core Media Audio
      Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 248 kb/s (default)
        Metadata:
          creation_time : 2020-07-31T20:46:43.000000Z
          handler_name : Core Media Audio

  The use case is basically this: we are uploading videos with a video stream and two audio streams. We would like to be able to use Cloudinary to transcode the videos such that the two audio streams are combined/overlapped/flattened into a single one.

  Does that make sense?

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  Francis Tagbo

  • August 05, 2020 09:08

  Hi Ravi,

  For multiple audio tracks, we are picking up the first one.

  Currently, we don't support such options.

  You can open a support ticket and share with us your video to see if we can have a workaround.

   

  Thanks,

  Francis

   

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  Ravi Ramphal

  • August 05, 2020 22:11

  Hi Francis,

  I think we'll just flatten the audio tracks on our end for now.

  Thank you!

  Ravi

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  Francis Tagbo

  • August 06, 2020 03:49

  Hi Ravi,

  Thanks for the update!

  Please don't hesitate to reach us if you have any questions or issues encountered.

   

  Regards,

  Francis

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  Tamara Yulevich

  • June 28, 2022 11:10

  You can create the manifest file with multiple audio tracks. Custom manifest files creation: https://cloudinary.com/documentation/adaptive_bitrate_streaming#manually_creating_representations_and_master_files

  Here is a blog that mentions the structure of such a file: https://tech47.in/blog/react-hls-vod-with-page-localisation

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