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• FFMPEG Undefined Reference to 'avcodoec_open2' in C++

  12 avril 2012, par ALM865

  I have an error when compiling one of my C++ programs after updating the FFMPEG library from 0.8 to 'ffmpeg version git-2012-04-12-277f20c'

  The error I get when I make my program is as follows :

  -------- begin --------
  
  Linking: Analysing_Server
  
  ./source/Encoding_Thread.o: In function `CEncoding_Thread::do_work()':
  
  /home/Analyser/source/Encoding_Thread.cpp:155: undefined reference to `avcodec_open2'
  
  collect2: ld returned 1 exit status
  
  make: *** [Analysing_Server] Error 1

  The relevant lines of my Make file is similar to running g++ as below :

  g++ test2.cpp -lavformat -lavcodec -lavutil -D__STDC_CONSTANT_MACROS

  A stripped down version of my relevant CPP code that throws the error is :

  #include 
  
  #include  
  
  
  
  #define LOG_OUT_STREAM_BUFF_SIZE  200000
  
  
  
  
  
  extern "C"  {
  
    /* The ffmpeg library is completely written in C, so we need to tell the C++ compiler that so it links correctly. */
  
    #include "stdint.h"
  
    #include "libavcodec/avcodec.h"
  
    #include "libavutil/mathematics.h"
  
    #include "libswscale/swscale.h"
  
    #include "libavfilter/avfilter.h"
  
  
  
    int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
  
    int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr);
  
  }
  
  
  
  uint8_t m_outbuf[2][LOG_OUT_STREAM_BUFF_SIZE];
  
  unsigned int m_out_size[2];
  
  unsigned int m_OutBuffer_ID[2];
  
  unsigned int m_Buffer_ID; /* This is just a uniqueish stamp we give to each buffer so we can tell when they change.. */
  
  
  
  AVCodecContext * m_CodecContex;
  
  AVCodec * m_codec;
  
  struct SwsContext *m_img_convert_ctx;
  
  
  
  unsigned char* m_DataBuff;
  
  
  
  int Output_Width, Output_Height;
  
  int Output_Bitrate;
  
  
  
  
  
  int main(void) {
  
    //New version of FFMPEG calls this in avcodec_register_all
  
    //avcodec_init();
  
  
  
    /* register all the codecs */
  
    avcodec_register_all();
  
  
  
    /* Initalise the encoder */
  
    m_codec = avcodec_find_encoder(CODEC_ID_MP2);
  
  
  
    if (!m_codec) {
  
      printf("Encoding codec not found\n");
  
    }
  
  
  
    /* init the pointers.. */
  
    m_CodecContex = NULL;
  
  
  
    /* Default values.. */
  
    Output_Width = 1600;
  
    Output_Height = 1200;
  
    Output_Bitrate = 600000;
  
  
  
    /* Create/setup the Codec details.. */
  
    //Changed to work with new FFMPEG
  
    m_CodecContex = avcodec_alloc_context3(m_codec);
  
    avcodec_get_context_defaults3(m_CodecContex, m_codec);
  
  
  
    /* put sample parameters */
  
    m_CodecContex->bit_rate = Output_Bitrate;
  
    /* resolution must be a multiple of two */
  
  
  
    m_CodecContex->width = Output_Width;
  
    m_CodecContex->height = Output_Height;
  
    /* frames per second */
  
    m_CodecContex->time_base= (AVRational){1,25};
  
  
  
    m_CodecContex->gop_size = 10; /* emit one intra frame every ten frames */
  
    m_CodecContex->max_b_frames=1;
  
    m_CodecContex->pix_fmt = PIX_FMT_YUV420P; /* must be YUV for encoding.. */
  
  
  
  
  
    AVDictionary * RetunedAVDic;
  
  
  
    /* open it */
  
    //Changed to work with new FFMPEG
  
    if (avcodec_open2(m_CodecContex, m_codec, &RetunedAVDic) < 0) {
  
        printf("could not open codec");
  
    }
  
  }

  Unfortunately the example under 'doc/examples/decoding_encoding.c' that comes with FFMPEG no longer works because all the functions that it uses are now depreciated. My code is based on the example code and worked fine with FFMPEG 0.8 but does not compile with the newest version of FFMPEG. I have changed some of the depreciated functions to their newer versions but it still doesn't compile.

  Does anyone know why I am getting this error ? or does anyone have a link to an example like 'doc/examples/decoding_encoding.c' using the newest version of FFMPEG ?

• iPhone HTTP Streaming .m3u8 and .ts files - how to create using ffmpeg

  8 septembre 2013, par ChessDev

  I'm trying to get apple-validated http media streams using ffmpeg and am getting errors. Here are some error examples :

  WARNING : Playlist Content-Type is 'application/x-mpegurl', but should
  be one of 'application/vnd.apple.mpegurl', 'audio/x-mpegurl' or
  'audio/mpegurl'.

  WARNING : 258 samples (88.966 %) do not have timestamps in track 256
  (avc1). 4 : us2-1.ts
   

  WARNING : Media segment duration outside of expected duration by 47.733
   % (5.23 vs. 10.00 seconds, limit is 20 %). 40 : us2-19.ts
   

  Average segment duration: 10.16 seconds
  
  Average segment bitrate: 320.12 kbit/s
  
  Average segment structural overhead: 175.89 kbit/s (54.94 %)
  
  
  
  Video codec: avc1
  
  Video resolution: 320x320 pixels
  
  Video frame rate: 29.72, 29.78, 29.82, 30.00, 29.64 fps
  
  Average video bitrate: 100.66 kbit/s
  
  H.264 profile: Baseline
  
  H.264 level: 3.0
  
  
  
  Audio codec: aac 
  
  Audio sample rate: 48000 Hz
  
  Average audio bitrate: 43.57 kbit/s

  ---

  Here is the end file I've been submitting : http://files.chesscomfiles.com/images_users/using/us2.m3u8

  Here is the file I used to create this : http://files.chesscomfiles.com/images_users/using/using-computers-1.mp4

  I've tried these commands, among others :

  ffmpeg -i using-computers-1.mp4 -f mpegts -acodec libfaac -ar 48000
  -ab 64k -s 320x320 -vcodec libx264 -vbsf h264_mp4toannexb -b 96k -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 2 -sc_threshold 40 -i_qfactor 0.71 -bt 200k -maxrate 96k -bufsize 96k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -g 30 -async 2 us2.ts

  ffmpeg -i using-computers-1.mp4 -f mpegts -acodec libfaac -ar 48000
  -ab 64k -s 320x320 -vcodec libx264 -vbsf h264_mp4toannexb -b 96k -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 200k -maxrate 96k -bufsize 96k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -g 30 -async 2 us1.ts

  ffmpeg -i using-computers-1.mp4 -vbsf h264_mp4toannexb -acodec copy -vcodec copy -f mpegts output.ts

  If someone can help me figure out what ffmpeg commands I should be running I'd really appreciate it !

• playback speed of ffmpeg-stitched python video plots

  30 juin 2012, par user1211129

  I've been generating videos out of plots made with matplotlib using a line of ffmpeg code. The output is in .mp4 format. However, when I tried to heighten the resolution of each individual plot to dpi=800, the resultant video (at 140 MB) lags severely when played back with quicktime. Is there a way around this ? I do wonder, if the file's too large to play efficiently, why does a movie of 6 GB play flawlessly ?