Duration audio Infinity

[antonio-vargas]

In the following function I send the URL, my problem is that the audio.duration gives me Infinity.

function recordingEndedCallback (urlBlob) {
  var audio = new Audio()
  audio.src = urlBlob
  audio.addEventListener('loadedmetadata', () => {
    console.log(audio.duration)
  }, false)
}

[gdurga]

Did you record using the MediaStreamRecorder? With the MediaStreamRecorder I got the same 'error', if I use StereoAudioRecorder everything works fine, the inconvenient is the file size

10 seconds: 350 KB with StereoAudioRecorder (numberOfAudioChannels: 1) 67 KB with MediaStreamRecorder

[antonio-vargas]

I want to capture in mp3 format to upload it to firebase but I get error in infinite audio

[vladpoltorin]

@gdurga can you provide a part of code how you get duration?

[gdurga]

@vladpoltorin Sure! Here is the code First record the audio with the MediaStreamRecorder to reduce the file size, like this:

    recorder = RecordRTC(microphone, {
        recorderType: MediaStreamRecorder,
        type: "audio",
        bufferSize: 4096,
        sampleRate: 44100,
        checkForInactiveTracks: true
    });

Then convert the file using ffmpeg to fix the infinite audio duration ffmpeg -i <original_file> -c copy -fflags +genpts <fixed_duration_file>

The resulting file are pretty much the same file size of the original and it has a defined duration

[nikosgi]

Also, when I try to record video with MediaStreamRecorder or MultiStreamRecorder I get infinity duration. StereoAudioRecorder works fine, giving the duration of the audio recording and WhammyRecorder results in a valid duration also.

@gdurga Is there a way to get the original duration without using ffmpeg?

[gdurga]

Hi @nikosgi, unfortunately the only way I found to get the duration using the MediaStreamRecorder is using ffmpeg to convert the file after the record :/ Using the StereoAudioRecorder works fine for me too but the file size will be much larger

[gdurga]

Here is a very basic example with Django -> https://github.com/gdurga/Django-RecordRTC-example Converts the file after the upload using the python os.system

[muaz-khan]

Someone mentioned this as well, however I didn't try it myself yet:

https://github.com/legokichi/ts-ebml

Can someone make it work without type-script compilers?

[akalana]

When I record the screen using throw the recordRTC but video length is infinite. Could you please tell me what should I do?

[shekar-raja]

Did anyone get a solution?

[iamsrujal]

I have integrated below solution. (It's working fine in desktop Chrome Version 100.0.4896.75 (Official Build) (64-bit)) Still need confirmation from different OS and browser.

In order to get the duration inside recorded file we have to add ts-ebml dependency. I have used webm-duration-fix npm.

By integrating above solution it's fixed my recording duration issue but still need to test in other OS and browsers.

[iamsrujal]

I have integrated below solution. (It's working fine in desktop Chrome Version 100.0.4896.75 (Official Build) (64-bit)) Still need confirmation from different OS and browser.

In order to get the duration inside recorded file we have to add ts-ebml dependency. I have used webm-duration-fix npm.

By integrating above solution it's fixed my recording duration issue but still need to test in other OS and browsers.

I did some test in android and IOS latest version by today date (14/04/2022).

It's working fine.

[praveenb4305]

can this be used for audio recording as well?