Swift WMA M4A to AMR Editing supports full audio CD playback control. Support Multiple CD-ROMs. Full support FreeDB and ID3, you can get the music information from internet easily and edit the music information yourself professionally. Support almost popular video files (DIVX, XVID, AVI, MPG, MPEG,VOB,VCD,SVCD,etc.) Automatically Shutdown Computer After Long Time ConversionPreview display: you can playback the video clip in preview window. Support Set the start position and end position of source file to convert.( cut movie clip to convert ). Support Batch files conversion. User-friendly interface : one click settings solution, need not any basic knowledge. World classic converting speed and quality.