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[Alfonso Sanchez-Beato <alfonso.sanchez-beato@xxxxxxxxxxxxx>]

@timo-jyrinki regarding whether this is fixed in xenial or newer:

1. xenial uses qtmultimedia 5.5.1, which depends on gstreamer1.0
2. gstreamer1.0 moved the opus[dec|enc] codecs to plugins-base in version 1.8, which is included by default in phone images

So yes, this should be solved in xenial and newer.

Note also that this issue is happening because qtmultimedia 5.4.1 uses
old gstreamer 0.10. In fact you can already use opus in OTA13 by using
directly gstreamer1.0 instead of via Qt.

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https://bugs.launchpad.net/bugs/1630399

Title:
  [Phone] Please enable opus audio codec support in qtmultimedia

Status in Canonical System Image:
  In Progress
Status in gst-plugins-bad0.10 package in Ubuntu:
  In Progress
Status in qtmultimedia-opensource-src package in Ubuntu:
  In Progress

Bug description:
  Hi, as described in QTBUG-50567 [1], qtmultimedia doesn't support opus
  audio codec so for example we cannot record Telegram voice messages (
  bug #1460464 and bug #1375179 ).

  I patched qtmultimedia adding the support for audio/x-opus codec
  through opusdec encoder in qtmultimedia, then I found qtmultimedia
  5.4.1 (shipped with Ubuntu Phone vivid) is built against gstreamer0.10
  and, as gstreamer0.10-plugins-bad packages is not installed by
  default, opusdec encoder is not available.

  I'm working on this bug, I created it to track the progress, in order
  to add opus support I have to:

  1 - create a new gstreamer0.10-opus package containing only the
  opusdec plugin: I don't know whether I have to create a new source
  package containing opusdec sources or only a new .deb package
  (generated from gst-plugins-bad0.10 sources). I'm working on the
  latter as gst-plugins-bad0.10 package requires work in any ways.

  2 - properly patch qtmultimedia source, I'm attaching a working-but-needs-cleanup patch. I think some opus declarations in the attached patch can be avoided, but I haven't had time to work on it so I'm attaching the patch I tested (requires gstreamer0.10-plugins-bad).
  I don't know if qtmultimedia xenial/yakkety versions requires the patch too, I haven't checked them yet.

  [1] https://bugreports.qt.io/browse/QTBUG-50567

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