搜索了一下：
./doubango/thirdparties/iphone/include/libavfilter/avfiltergraph.h
./doubango/thirdparties/mac/include/libavfilter/avfiltergraph.h
./doubango/thirdparties/android/common/include/libavfilter/avfiltergraph.h
./doubango/thirdparties/win32/include/libavfilter/avfiltergraph.h
怎么没有LINUX的？把win32下的复制过去，编译通过。
