关于编译idoubs出错：Apple Mach-O Linker Error

Undefined symbols for architecture i386:
 "_th_comment_clear", referenced from:
 _encode_init in libavcodec.a(libtheoraenc.o)
 "_th_comment_init", referenced from:
 _encode_init in libavcodec.a(libtheoraenc.o)
 "_th_encode_alloc", referenced from:
 _encode_init in libavcodec.a(libtheoraenc.o)
 "_th_encode_ctl", referenced from:
 _submit_stats in libavcodec.a(libtheoraenc.o)
 _get_stats in libavcodec.a(libtheoraenc.o)
 _encode_init in libavcodec.a(libtheoraenc.o)
 "_th_encode_flushheader", referenced from:
 _encode_init in libavcodec.a(libtheoraenc.o)
 "_th_encode_free", referenced from:
 _encode_close in libavcodec.a(libtheoraenc.o)
 "_th_encode_packetout", referenced from:
 _encode_frame in libavcodec.a(libtheoraenc.o)
 "_th_encode_ycbcr_in", referenced from:
 _encode_frame in libavcodec.a(libtheoraenc.o)
 "_th_info_clear", referenced from:
 _encode_init in libavcodec.a(libtheoraenc.o)
 "_th_info_init", referenced from:
 _encode_init in libavcodec.a(libtheoraenc.o)
 ld: symbol(s) not found for architecture i386
 clang: error: linker command failed with exit code 1 (use -v to see invocation)

以上是编译idoubs目标时候的错误，用的Xcode6.1，添加了一些框架，感觉不应该是缺少框架了吧，请各位大神们赐教啊！！！