Transmageddon fails to convert .flv due to Python problem

[John Rose]

In Trusty, Transmageddon fails to convert .flv due to Python problem: though it worked OK in Precise i.e. this is a regression bug. The .flv file has video codec H.264 & audio codec MPEG-4 AAC. I set Output Format as MPEG-4 with Audio Codec as Audio Passthrough & Video Codec as Video Passthrough. When I click the Transcode button, a window pops up stating "Required plugin could not be found. Python (v3.4) requires to install plugins to play media files of the following type: Uncompressed planar YUV 4:4:4 decoder".

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: transmageddon 0.25-2
ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
Uname: Linux 3.13.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jul 9 10:02:20 2014
InstallationDate: Installed on 2014-04-25 (75 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
SourcePackage: transmageddon
UpgradeStatus: No upgrade log present (probably fresh install)