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• FFmpeg open codec error when using "MobileVLCKit-prod" pod Swift

  28 novembre 2016, par OuSS

  I want to use VLCMediaPlayer into my project to live stream

  I’m using pod 'MobileVLCKit-prod'

  and this is my code

  class CameraViewController: UIViewController,VLCMediaPlayerDelegate{
  
  
  
    var mediaPlayer = VLCMediaPlayer()
  
  
  
    override func viewDidLoad() {
  
        super.viewDidLoad()
  
  
  
        mediaPlayer.delegate = self
  
        mediaPlayer.drawable = playerView
  
        let url = NSURL(string: "URL HERE")
  
        mediaPlayer.media = VLCMedia(URL: url!)
  
        mediaPlayer.play()
  
    }
  
  }

  When i run my app i got ffmpeg open codec error :

• Streaming H.264 over UDP using FFmpeg, and "dimensions not set" error

  3 septembre 2015, par Baris Demiray

  I’m trying to stream H.264 over UDP with no luck so far. Here is a minimal code that you can reproduce the problem.

  To compile,

  g++ -o test -lavcodec -lavformat -lavutil test.cpp

  Extra information, I start ffplay as follows. Currently it’s of no use.

  ffplay -i udp://127.0.0.1:8554/live.sdp

  Output of my code (see avio_open() call),

  [libx264 @ 0x6a26c0] using mv_range_thread = 24
  
  [libx264 @ 0x6a26c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
  
  [libx264 @ 0x6a26c0] profile High, level 3.1
  
  Output #0, h264, to 'udp://127.0.0.1:8554/live.sdp':
  
      Stream #0:0, 0, 0/0: Video: h264 (libx264), -1 reference frame, none, q=-1--1
  
  [h264 @ 0x6a2020] dimensions not set
  
  Cannot write header to stream: Success

  And the code,

  extern "C" {
  
      #include <libavcodec></libavcodec>avcodec.h>
  
      #include <libavformat></libavformat>avformat.h>
  
      #include <libavutil></libavutil>avutil.h>
  
  }
  
  
  
  #include <iostream>
  
  using namespace std;
  
  
  
  int main() {
  
      AVCodecContext* m_codecContext;
  
      AVCodec* m_codec;
  
      AVFormatContext* m_formatContext;
  
      AVStream* m_stream;
  
  
  
      unsigned m_outWidth = 768;
  
      unsigned m_outHeight = 608;
  
  
  
      av_register_all();
  
      avcodec_register_all();
  
      avformat_network_init();
  
  
  
      int errorStatus = 0;
  
      char errorLog[128] = { 0 };
  
      av_log_set_level(AV_LOG_TRACE);
  
  
  
      string m_output("udp://127.0.0.1:8554/live.sdp");
  
  
  
      if (avformat_alloc_output_context2(&amp;m_formatContext, NULL, "h264", m_output.c_str()) &lt; 0) {
  
          cerr &lt;&lt; "Cannot allocate output context: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      AVOutputFormat *m_outputFormat = m_formatContext->oformat;
  
  
  
      m_codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
      if (!m_codec) {
  
          cerr &lt;&lt; "Cannot find an encoder: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      m_codecContext = avcodec_alloc_context3(m_codec);
  
      if (!m_codecContext) {
  
          cerr &lt;&lt; "Cannot allocate a codec context: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      m_codecContext->pix_fmt = AV_PIX_FMT_YUV420P;
  
      m_codecContext->width = m_outWidth;
  
      m_codecContext->height = m_outHeight;
  
  
  
      if (avcodec_open2(m_codecContext, m_codec, NULL) &lt; 0) {
  
          cerr &lt;&lt; "Cannot open codec: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      m_stream = avformat_new_stream(m_formatContext, m_codec);
  
      if (!m_stream) {
  
          cerr &lt;&lt; "Cannot create a new stream: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      av_dump_format(m_formatContext, 0, m_output.c_str(), 1);
  
  
  
      if ((errorStatus = avio_open(&amp;m_formatContext->pb, m_output.c_str(), AVIO_FLAG_WRITE)) &lt; 0) {
  
          cerr &lt;&lt; "Cannot open output: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      if (avformat_write_header(m_formatContext, NULL) &lt; 0) {
  
          cerr &lt;&lt; "Cannot write header to stream: "
  
               &lt;&lt; av_make_error_string(errorLog, 128, errorStatus) &lt;&lt; endl;
  
          return -1;
  
      }
  
  
  
      cout &lt;&lt; "All done." &lt;&lt; endl;
  
  
  
      return 0;
  
  }
  
  </iostream>

  For those who has even more time to spare on my problem, when I change m_output to rtsp://127.0.0.1:8554/live.sdp, and ffplay command to ffplay -rtsp_flags listen -i rtsp://127.0.0.1:8554/live.sdp I get the error,

  [libx264 @ 0x1e056c0] using mv_range_thread = 24
  
  [libx264 @ 0x1e056c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
  
  [libx264 @ 0x1e056c0] profile High, level 3.1
  
  Output #0, h264, to 'rtsp://127.0.0.1:8554/live.sdp':
  
      Stream #0:0, 0, 0/0: Video: h264 (libx264), -1 reference frame, none, q=-1--1
  
  Cannot open output: Protocol not found

  Am I naive to expect that streaming protocol will be changed like this ?

• gcc error- "error adding symbols : DSO missing from command line"

  10 août 2015, par ben marder

  I’m trying to compile tutorial 01 from enter link description herehttp://dranger.com/ffmpeg/tutorial01.html
  copy pasted the code from here : http://dranger.com/ffmpeg/tutorial01.c
  tried to compile (on linux) like the tutorial said with :

  gcc -o tutorial01 tutorial01.c -lavformat -lavcodec -lswscale -lz

  and got an error

  : /usr/bin/ld: /tmp/ccIT5t82.o: undefined reference to symbol 'av_malloc@@LIBAVUTIL_51'
  
  /usr/lib/i386-linux-gnu/libavutil.so.51: error adding symbols: DSO missing from command line
  
  collect2: error: ld returned 1 exit status

  any suggestions ?