適用平台：Fedora 8 64位系統驗證通過。
故障原因：yum方式安裝了mplayer。下載了all-codecs解碼包，解壓到readme中所說的/usr/local/lib/codecs/目錄仍然不能播放rmvb。只有聲音沒有圖像，提示Cannot find codec matching selected -vo and video format 0x30345652。其實mplayer官方的解碼包名稱模糊，all-codecs並不含有rmvb解碼所需的全部解碼器。另外由於非源碼安裝的mplayer路徑並不是/usr/local/lib/codecs/。
解決方法:正確安裝適用64位系統的解碼器
解決步驟:
1、從http://www.mplayerhq.hu/MPlayer/releases/codecs/下載下面四個文件
all-20071007.tar.bz2
essential-amd64-20071007.tar.bz2
windows-all-20071007.zip
windows-essential-20071007.zip
2、在命令行模式下用mplayer播放一個rmvb格式的文件，注意查看出錯信息，看mplayer是從哪兒讀取的插件。
我的出錯信息如下
Opening video decoder: [realvid] RealVideo decoder
Error: /usr/lib64/codecs/drvc.so:
cannot open shared object file: No such file or directory
ERROR: Could not open required DirectShow codec drvc.so.
Read the RealVideo section of the DOCS!
VDecoder init failed :(
Opening video decoder: [realvid] RealVideo decoder
ERROR: Could not open required DirectShow codec drvc.dll.
Read the RealVideo section of the DOCS!
VDecoder init failed :(
Opening video decoder: [realvid] RealVideo decoder
Error: /usr/lib64/codecs/drv4.so.6.0:
cannot open shared object file: No such file or directory
ERROR: Could not open required DirectShow codec drv4.so.6.0.
Read the RealVideo section of the DOCS!
VDecoder init failed :(
Opening video decoder: [realvid] RealVideo decoder
ERROR: Could not open required DirectShow codec drv43260.dll.
Read the RealVideo section of the DOCS!
VDecoder init failed :(
Opening video decoder: [realvid] RealVideo decoder
Error: /usr/lib64/codecs/drvc.bundle/Contents/MacOS/drvc:
cannot open shared object file: No such file or directory
ERROR: Could not open required DirectShow codec drvc.bundle/Contents/MacOS/drvc.
Read the RealVideo section of the DOCS!
VDecoder init failed :(
Cannot find codec matching selected -vo and video format 0x30345652.
Read DOCS/HTML/en/codecs.html!
所以我的mplayer解碼目錄是/usr/lib64/codecs
3、將上述4個文件解壓到你自己的mplayer提示目錄即可（例如，我的系統就將4個文件解壓到/usr/lib64/codecs目錄）。
注意事項：
1、實際上播放rmvb只要幾個文件，將所有的解碼器放在一起是防止播放其他文件出
現類似問題。
2、所有的文件直接在codecs目錄下，而不是在codecs/all-20071007等類似目錄下。
