Transmageddon 0.20 is this new release tagged by Christian Schaller. This release took a while in part due to having to work out bugs in GStreamer and waiting for a new python-gstreamer release, which has now occurred with version 0.10.22.
New features to this open-source video transcoder include porting to use the new plugins-base discoverer and encodebin, support for audio-only transcoding, support for outputting audio only from A/V files, de-interlacing support, container-free audio format support (FLAC, MP3, AAC), HTML5 and Nokia N900 profiles, support for video-only transocding, and support for MPEG-1 video and MPEG-2 audio.
The new user-interface to Transmageddon 0.20 should help those transcoding audio/video files from small form factors, the HTML5 profile uses WebM, and various other benefits from this new release.
Next up for this open-source project is porting the interface to GTK3 and internally to begin using GStreamer 1.0.
You can learn more about the Transmageddon 0.20 release from Schaller's blog post and the project web-site.