This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Natao arisiva ity resaka mitohy ity. Mametraha fanontaniana azafady raha mila fanampiana.

MediaRecorder does not resample Opus input audio

  • 3 valiny
  • 1 manana an'ity olana ity
  • 1 view
  • Valiny farany nomen'i raycarino

more options

I'm on firefox 59. My microphone records audio at a sample rate of 44.1khz. Per OpusTrackEncoder https://github.com/mozilla/gecko-dev/blob/a341b32d064bafac5422f72fef6afe740045105c/dom/media/encoder/OpusTrackEncoder.cpp#L162 and this bug https://bugzilla.mozilla.org/show_bug.cgi?id=922247, I would have expected a MediaRecorder to emit ogg-opus audio at 48khz, but it's still 44.1khz after inspecting the ogg header.

Am I wrong in undrestanding that MediaRecorder should resample to 48khz if the microphone's sample rate is non-standard?

I'm on firefox 59. My microphone records audio at a sample rate of 44.1khz. Per OpusTrackEncoder https://github.com/mozilla/gecko-dev/blob/a341b32d064bafac5422f72fef6afe740045105c/dom/media/encoder/OpusTrackEncoder.cpp#L162 and this bug https://bugzilla.mozilla.org/show_bug.cgi?id=922247, I would have expected a MediaRecorder to emit ogg-opus audio at 48khz, but it's still 44.1khz after inspecting the ogg header. Am I wrong in undrestanding that MediaRecorder should resample to 48khz if the microphone's sample rate is non-standard?

All Replies (3)

more options

Forgot to mention that I'm using the MediaRecorder like so: https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder#Example

more options

This topic might be beyond the expertise of this forum. There is a developer mailing list for media-related topics that might be a good place to try next:

https://lists.mozilla.org/listinfo/dev-media

more options

Thank you jscher2000!