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• ffmpeg avformat_open_input always returns "Protocol not found" rv=(-1330794744)

  7 juin 2019, par bzivkovic

  Trying to get ffmpeg working in Visual Studio 2010. So far all ffmpeg headers and libs are loaded, no error or warning occurs.

  avcodec_register_all();
  
  AVFormatContext *pFormatCtx = NULL;
  
  char errbuf[256];
  
  pFormatCtx = avformat_alloc_context();
  
  int rv = avformat_open_input(&pFormatCtx, "myfile.ext", NULL, NULL);
  
  if (rv!=0){                              
  
      av_strerror(rv, errbuf, sizeof(errbuf));
  
  }

  The problem is, avformat_open_input always returning -1330794744 (errbuf="Protocol not found"). Tried x86 & x64 headers and libs on 32bit XP and 64bit W7. Whatever I put for "myfile.ext" (tried "file1.avi", "file=c :\file1.avi", "http://www.someweb.com/file1.avi", and even empty char* "") response is always "Protocol not found". Any ideas ?

• ffmpeg, Audiostream : How to get type (fourcc) of it with the API ?

  21 août 2021, par User42

  This seems to be a too simple question,
but I was not successful in getting it :

  


  I have no problems with decoding a stream and accessing the data.
But I also need the bitrate and the type of the stream.

  


  The bitrate and the codec used I get by AVCodecContext's members
bit_rate and codec_id.

  


  But I don't need the codec used but the stream type
(as the codec AV_CODEC_ID_MP3 is used for mp1, mp2 and mp3 for example).

  


  I tried AVStream.id, but it is always 0.

  


  Looks like I'm mixing up things, but where ?

  


• RTP Streaming with ffmpeg : server streaming, client failing

  27 novembre 2013, par Christoph Kuhr

  I compiled ffmpeg and x264 myself.

  x264 version :

   #define X264_REV 2377
  
   #define X264_REV_DIFF 0
  
   #define X264_VERSION " r2377 1ca7bb9"
  
   #define X264_POINTVER "0.140.2377 1ca7bb9"

  ffmpeg version : 0.11.4
  ffmpeg configuration :

   --enable-x11grab --enable-pthreads --enable-libfaac --enable-libxvid --enable-libx264 --enable-libv4l2 --enable-libmp3lame --enable-libpulse --enable-gpl --enable-nonfree --disable-yasm

  streaming server call :

  ffmpeg -f x11grab -s 1600x900 -framerate 50 -i :0.0 -vcodec libx264 -threads 4 -preset ultrafast -crf 0 -q:v 1 -b:v 8M -an -f rtp rtp://192.168.188.30:8710
  
  
  
  ...
  
  
  
   Output #0, rtp, to 'rtp://192.168.188.30:8710':
  
    Metadata:
  
      encoder         : Lavf54.6.100
  
      Stream #0:0: Video: h264, yuv420p, 1600x900, q=-1--1, 8000 kb/s, 90k tbn, 50 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
  SDP:
  
  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 192.168.188.30
  
  t=0 0
  
  a=tool:libavformat 54.6.100
  
  m=video 8710 RTP/AVP 96
  
  b=AS:8000
  
  a=rtpmap:96 H264/90000
  
  a=fmtp:96 packetization-mode=1

  Everything looks good so far...

  Now the problem.
  I create foo.sdp from the SDP output of the server and try to playback the stream with ffmpeg ffplay foo.sdp. ffplay fails with the following error :

   [sdp @ 0x7f5e0c0008c0] decoding for stream 0 failed
  
   [sdp @ 0x7f5e0c0008c0] Could not find codec parameters (Video: h264)
  
   [sdp @ 0x7f5e0c0008c0] Estimating duration from bitrate, this may be inaccurate
  
   gameserver.sdp: could not find codec parameters

  If I try the same with VLC, it also fails, but with the different error :

    [0x7f3278c045b8] live555 demux error: no data received in 10s, aborting

  Look like different reasons. But I could not solve either. Does anyone have a clue ?