There is thousand of bugs opened and backporting a fix to stable requires efforts, somebody has to work on the update, make sure it works fine, then somebody has to approve it then quality people have to make sure it works fine and not creating any regression. We can't spend those efforts on every problem and usually bugs are fixed to the currently worked distribution and the fix is available with the next stable version. Fixes are backport for security issues and for problems which are juged annoying enough to require a quick fix. gstreamer0.10-ffmpeg is an universe package, which means it's not officially supported, the distribution team is not going to spend effort backporting a fix then. Maybe somebody from the MOTU team will be willing to work on that though
There is thousand of bugs opened and backporting a fix to stable requires efforts, somebody has to work on the update, make sure it works fine, then somebody has to approve it then quality people have to make sure it works fine and not creating any regression. We can't spend those efforts on every problem and usually bugs are fixed to the currently worked distribution and the fix is available with the next stable version. Fixes are backport for security issues and for problems which are juged annoying enough to require a quick fix. gstreamer0. 10-ffmpeg is an universe package, which means it's not officially supported, the distribution team is not going to spend effort backporting a fix then. Maybe somebody from the MOTU team will be willing to work on that though