Sony NWZ-A844 4/3 -b 567k -s 320x240 -vcodec mpeg4 -ab 220k -ar 44100 -ac 2 -acodec libvo_aacenc mp4 Sony Walkman Sony NWZ-A844 16/10 (full) -b 567k -s 400x240 -vcodec mpeg4 -ab 220k -ar 44100 -ac 2 -acodec libvo_aacenc mp4 Sony Walkman