1267248 - MediaRecorder audio quality depends on AudioContext

Status: RESOLVED DUPLICATE of bug 1257318

(Core :: Audio/Video: Recording, defect)

Description

[craig.leat]

Attachment: MediaRecorder Demo

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0
Build ID: 20160413222546

Steps to reproduce:

The attached Web Dictaphone example uses default settings for MediaRecorder.


Actual results:

The demo produces poor quality audio recordings in Firefox and Fennec. Poor quality means excessive scratchy interference. The problem disappears when calling  AudioContext.createMediaStreamSource().

Uncomment line 37 in the demo to hear this behaviour.


Expected results:

MediaRecorder and AudioContext are two separate interfaces AKAIK. I should not require AudioContext unless I need to add filters, etc. MediaRecorder should work on its own.

Comment 1

[Randell Jesup [:jesup] (needinfo me)]

Have you tried this with Beta, Developer Edition or Nightly?  We made major improvements to MediaRecorder quality, but these improvements aren't in release yet (this may be Bug 1257318 which is in 47 (Beta) and later).

Comment 2

[craig.leat]

(In reply to Randell Jesup [:jesup] from comment #1)
> Have you tried this with Beta, Developer Edition or Nightly?  We made major
> improvements to MediaRecorder quality, but these improvements aren't in
> release yet (this may be Bug 1257318 which is in 47 (Beta) and later).

The poor quality is still present on 46.0, but I'm unable to repro on 47.0b4 with Firefox and Fennec. It appears the mentioned bugfix resolves this issue. Thanks!