Rendered video has no audio

Rendering a video audio mix back to anyone of the standard available formats, results in a output file without audio.
Research into this bug delivered me to

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=761593

"This issue appeared when libmlt6 was recompiled against libav* 0.11, and
reinstalling libmlt6 0.9.2-1 and the older libav* dependencies - now
only available at snapshot.debian.org - it works correctly again."

and this too :-

MLT linkage with libav* 0.11 has apparently been fixed upstream now:
https://github.com/mltframework/mlt/commit/3ac0201

There is a PPA on Launchpad, by Olivier Banus here :-

https://launchpad.net/~sunab/+archive/ubuntu/kdenlive-release

I couldn't get that to install on 14.10 Plasma 5, most likely a dependency, as apt-get said it was holding back
kdenlive kdenlive-data and libmlt6

I sense that what is required is to update the sources, and repackage against the latest stable binaries.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: kdenlive 0.9.8-1ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
Uname: Linux 3.16.0-25-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Dec 8 15:19:59 2014
InstallationDate: Installed on 2014-11-28 (10 days ago)
InstallationMedia: Kubuntu-Plasma-5 14.10 "Utopic Unicorn" - Release amd64 (20141022)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: kdenlive
UpgradeStatus: No upgrade log present (probably fresh install)