Mplayer could not distinguish the sub-fuzziness=1 subtitle who with chinese full-name

Binary package hint: mplayer

Mplayer could not distinguish the sub-fuzziness=1 subtitle who with chinese full-name,

For example :
天下第一.avi
天下第一.srt
开心万岁好不好.avi
开心万岁好不好.srt
其他.srt

If i Play 天下第一.avi the subtitle is "天下第一.srt " ,But the "开心万岁好不好.srt " is the second subtitle of 天下第一.avi ,the "其他.srt" is the third subtitle
~/.mplayer/config
sub-fuzziness=1
subcp=cp936
font=~/font/zh.ttf

It would only recognise one subtitle . "天下第一.srt " , but all the full-chinese name of subtitle would be the subtitles file of full-chinese name moive

If playback "开心万岁好不好.avi ", "天下第一.srt " and "开心万岁好不好.srt " "其他.srt" all would be the subtitles .