Question

我是iPhone应用开发的新手，我想通过我的应用在iPhone上进行直播。请建议我如何在iPhone / iPad上开发视频流。目前，我在iPhone中集成了用于rtsp视频流的dropcam库，但在我的项目中集成了Live555，DecoderWrapper，ffmpeg和libswscale库之后，我得到了15个错误：

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)
  "_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
clang: error: linker command failed with exit code 1 (use -v to see invocation)

请帮我解决这些错误，或者告诉我如何在iPhone / iPad上播放视频流。

Answer 1

选择您的项目＆gt;构建阶段＆gt; expand Compile Sources＆gt;按+＆gt;添加libDecoderWrapper.m

或者删除库并重新添加到Xcode，同时确保＆＃34;添加到目标＆＃34;选中复选框以自动将所有内容添加到编译源阶段，Xcode 4.3存在一个错误，使得该复选框无法选中。

获取xcode中dropcam库的错误集成

1 个答案: