ffmpeg 在mac os x 编译完成后,在项目中导入 (.a)文件后出现一下错误:Undefined symbols for architecture i386:
  "_CGAffineTransformMakeRotation", referenced from:
      -[iFrameExtractorAppDelegate applicationDidFinishLaunching:] in iFrameExtractorAppDelegate.o
  "_av_register_all", referenced from:
      -[VideoFrameExtractor initWithVideo:] in VideoFrameExtractor.o
  "_av_open_input_file", referenced from:
      -[VideoFrameExtractor initWithVideo:] in VideoFrameExtractor.o
  "_av_find_stream_info", referenced from:
      -[VideoFrameExtractor initWithVideo:] in VideoFrameExtractor.o
  "_avcodec_find_decoder", referenced from:
      -[VideoFrameExtractor initWithVideo:] in VideoFrameExtractor.o
  "_avcodec_open", referenced from:
      -[VideoFrameExtractor initWithVideo:] in VideoFrameExtractor.o
  "_avcodec_alloc_frame", referenced from:
      -[VideoFrameExtractor initWithVideo:] in VideoFrameExtractor.o
  "_avpicture_free", referenced from:
      -[VideoFrameExtractor setupScaler] in VideoFrameExtractor.o
      -[VideoFrameExtractor dealloc] in VideoFrameExtractor.o
  "_sws_freeContext", referenced from:
      -[VideoFrameExtractor setupScaler] in VideoFrameExtractor.o
      -[VideoFrameExtractor dealloc] in VideoFrameExtractor.o
  "_avpicture_alloc", referenced from:
      -[VideoFrameExtractor setupScaler] in VideoFrameExtractor.o
  "_sws_getContext", referenced from:
      -[VideoFrameExtractor setupScaler] in VideoFrameExtractor.o
  "_avformat_seek_file", referenced from:
      -[VideoFrameExtractor seekTime:] in VideoFrameExtractor.o
  "_avcodec_flush_buffers", referenced from:
      -[VideoFrameExtractor seekTime:] in VideoFrameExtractor.o
  "_av_free", referenced from:
      -[VideoFrameExtractor dealloc] in VideoFrameExtractor.o
  "_avcodec_close", referenced from:
      -[VideoFrameExtractor dealloc] in VideoFrameExtractor.o
  "_av_close_input_file", referenced from:
      -[VideoFrameExtractor dealloc] in VideoFrameExtractor.o
  "_avcodec_decode_video2", referenced from:
      -[VideoFrameExtractor stepFrame] in VideoFrameExtractor.o
  "_av_free_packet", referenced from:
      -[VideoFrameExtractor stepFrame] in VideoFrameExtractor.o
  "_av_read_frame", referenced from:
      -[VideoFrameExtractor stepFrame] in VideoFrameExtractor.o
  "_sws_scale", referenced from:
      -[VideoFrameExtractor convertFrameToRGB] in VideoFrameExtractor.o
  "_CGDataProviderCreateWithCFData", referenced from:
      -[VideoFrameExtractor imageFromAVPicture:width:height:] in VideoFrameExtractor.o
  "_CGColorSpaceCreateDeviceRGB", referenced from:
      -[VideoFrameExtractor imageFromAVPicture:width:height:] in VideoFrameExtractor.o
  "_CGImageCreate", referenced from:
      -[VideoFrameExtractor imageFromAVPicture:width:height:] in VideoFrameExtractor.o
  "_CGColorSpaceRelease", referenced from:
      -[VideoFrameExtractor imageFromAVPicture:width:height:] in VideoFrameExtractor.o
  "_CGImageRelease", referenced from:
      -[VideoFrameExtractor imageFromAVPicture:width:height:] in VideoFrameExtractor.o
  "_CGDataProviderRelease", referenced from:
      -[VideoFrameExtractor imageFromAVPicture:width:height:] in VideoFrameExtractor.o
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status
刚开始看 ffmpeg不是很了解 ,希望哪位大神  解答下!!感谢。