Avidemux 2.6.1

* Various improvements to MP4, FLV and MPEG-PS/TS demuxers
* Improved handling of input PTS and DTS
* Improved external audio file support
* Improved video seeking in editor
* Fixed numerous memory leaks
* Updated FFmpeg libraries (version 1.0.1)
* Restored additional x264 options
* Restored non-blocking drag-and-drop support for Qt interface
* Restored Fade to Black video filter plugin