Specify Audio Codec on .audioStreams[0] (Enhancement)

[r0hin]

When running something like

await video.fetch()
console.log(video.audioStreams[0])

it returns something like

 quality: 'AUDIO_QUALITY_LOW',
 container: 'webm',
 bitrate: 54075,
 size: 1121689,
 type: 'audio',
 url: '...',
 decipher: true

Yet, I don't know if the specific audio codec is opus, aac, etc. It would be good to add a field specifying what codec the webm file is. In the meantime, is there any temporary solution to this?

Thank you!

[gatecrasher777]

Although it is not explicit: Container webm indicates that it is opus (webm being vp9 video / opus audio) Container mp4 indicates that it is aac (mp4 being h264 video / aac audio)

[r0hin]

Although it is not explicit:

Container webm indicates that it is opus (webm being vp9 video / opus audio)

Container mp4 indicates that it is aac (mp4 being h264 video / aac audio)

Ah I see. Are you sure this consistent across all videos? I remember some videos were encoded differently but that was with a different library and about three months ago.

[gatecrasher777]

It is totally consistent at the videoStream/audioStream stage. webm will always be opus. mp4 will always be aac. So if you are choosing what streams to download, you can be assured.

If you chose 'mkv' for container, then during the download stage it can create files with an mkv extension. In those cases, the audio could be either opus or aac.

But after downloading you can always check video.audioCodec and video.videoCodec to see what was downloaded.

[r0hin]

Oh I see, well that makes things a lot easier to work with :) Thanks for your help!

On Nov 3, 2021, at 9:07 AM, gatecrasher777 @.***> wrote:

It is totally consistent at the videoStream/audioStream stage. webm will always be opus. mp4 will always be aac. So if you are choosing what streams to download, you can be assured.

If you chose 'mkv' for container, then during the download stage it can create files with an mkv extension. In those cases, the audio could be either opus or aac.

But after downloading you can always check video.audioCodec and video.videoCodec to see what was downloaded.

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[r0hin]

On the video of ID "PkKOdE1eaX4", only two audio streams are returned:

[
  {
    quality: 'AUDIO_QUALITY_MEDIUM',
    container: 'mp4',
    bitrate: 130980,
    size: 4105494,
    type: 'audio',
    url: (url),
    decipher: true
  },
  {
    quality: 'AUDIO_QUALITY_LOW',
    container: 'mp4',
    bitrate: 327836,
    size: 10389133,
    type: 'both',
    url: (url)
    decipher: true
  }
]

I have previously only used webm files of type opus. I was just wondering if you know about the codecs used in these mp4 files. VLC shows the following:

I am using the MediaSource Web API and also need to know the "mimeType" if you know it as well. Thank you for your help!

[gatecrasher777]

Generally, audio container "mp4" will be "aac". However, I will add mimeType and the codec label to the videoStreams and audioStreams on the next update.

[r0hin]

Think you're right, although there's also a video stream in the mp4 it seems. Anyhow, mime type would definitely be helpful here. Thank you for your help!

Also- let me know if you've got a donation link somewhere as this library and your quick support has been extremely helpful!!