我正在开发一个应用程序，通过 rtsp 从 IP 摄像机流式传输 iPhone 上的实时视频。我正在使用 live555、DecoderWrapper 和 RTSPClient 等开源项目。编译项目时出现以下错误。
Undefined symbols for architecture i386:
"_av_register_all", referenced from:
+[VideoDecoder staticInitialize] in libDecoderWrapper.a(VideoDecoder.o)
"_avcodec_init", referenced from:
+[VideoDecoder staticInitialize] in libDecoderWrapper.a(VideoDecoder.o)
"_av_log_set_callback", referenced from:
+[VideoDecoder registerLogCallback:] in libDecoderWrapper.a(VideoDecoder.o)
"_avcodec_find_decoder", referenced from:
-[VideoDecoder initWithCodec:colorSpace:width:height:privateData:] in libDecoderWrapper.a(VideoDecoder.o)
"_avcodec_alloc_context", referenced from:
-[VideoDecoder initWithCodec:colorSpace:width:height:privateData:] in libDecoderWrapper.a(VideoDecoder.o)
"_av_malloc", referenced from:
-[VideoDecoder initWithCodec:colorSpace:width:height:privateData:] in libDecoderWrapper.a(VideoDecoder.o)
-[VideoDecoder decodeFrame:] in libDecoderWrapper.a(VideoDecoder.o)
"_avcodec_alloc_frame", referenced from:
-[VideoDecoder initWithCodec:colorSpace:width:height:privateData:] in libDecoderWrapper.a(VideoDecoder.o)
"_avcodec_open", referenced from:
-[VideoDecoder initWithCodec:colorSpace:width:height:privateData:] in libDecoderWrapper.a(VideoDecoder.o)
"_avcodec_decode_video2", referenced from:
-[VideoDecoder decodeFrame:] in libDecoderWrapper.a(VideoDecoder.o)
"_avpicture_get_size", referenced from:
-[VideoDecoder decodeFrame:] in libDecoderWrapper.a(VideoDecoder.o)
"_avpicture_fill", referenced from:
-[VideoDecoder decodeFrame:] in libDecoderWrapper.a(VideoDecoder.o)
"_sws_getContext", referenced from:
-[VideoDecoder decodeFrame:] in libDecoderWrapper.a(VideoDecoder.o)
"_sws_scale", referenced from:
-[VideoDecoder getDecodedFrame] in libDecoderWrapper.a(VideoDecoder.o)
"_avpicture_free", referenced from:
-[VideoDecoder getDecodedFrame] in libDecoderWrapper.a(VideoDecoder.o)
"_avpicture_alloc", referenced from:
-[VideoDecoder getDecodedFrame] in libDecoderWrapper.a(VideoDecoder.o)
"_av_picture_copy", referenced from:
-[VideoDecoder getDecodedFrame] in libDecoderWrapper.a(VideoDecoder.o)
"_av_free", referenced from:
-[VideoDecoder dealloc] in libDecoderWrapper.a(VideoDecoder.o)
"_avcodec_close", referenced from:
-[VideoDecoder dealloc] in libDecoderWrapper.a(VideoDecoder.o)
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status
我已经尝试过不同的解决方案，例如检查我是否将任何框架复制到我的项目中。我已经检查过，“框架搜索路径”中没有任何内容。当我在我的项目中使用“ffmpeg”时，我也尝试为 i386 编译库，然后将这些库添加到我的项目中。但没有任何效果！有人可以帮帮我吗？如果需要，我可以提供代码详细信息。