So after a long hiatus I finally managed to push out a new Transmageddon release, 0.16. In addition to a lot of new translations (big thanks to all members of the GNOME translation team) there are a few bugfixes in there, but most importantly this release adds support for the new WebM format, enabling you to quickly and easily make such files. Thanks to the work Sebastian and David did this was very easy for me.
To make this work however you will need a lot of bleeding edge software, including todays git master of gst-plugins-good and gst-plugins-bad and libvpx installed (libvpx adds VP8 support).
This release also lets you put the On VP8 codec into other container formats, such as Ogg, Quicktime and AVI.
For Fedora users I recommend grabbing the latest libvpx SRPM created by Tom "spot" Callaway from Red Hat bugzilla. It should work perfectly with the GStreamer configure scripts.
For Ubuntu users I recommend the GStreamer PPA repository for getting latest libvpx. You probably need a newer gst-plugins-good than you find there right now though, but hopefully we will get that PPA updated today.
I also think libvpx has been packaged into Debian.
So I think that with this release Transmageddon is the first free software encoding GUI tool supporting the WebM format. At minimum the first I care about ;)
You can download Transmageddon 0.16 from the usual location on the Transmageddon homepage.
Note: Some long standing bugs, like trouble identifying some input files and no deinterlacing support, are still not fixed. I am waiting for Gst-conveniece to be ready with Python bindings, in order to fix those two bugs.