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• Is it possible to mimic the codec settings of a given media file with ffmpeg ?

  5 août 2014, par Konstantin

  I would like to concat two mkv video file, one 1 sec (32 frames), and one 20 min, but the shorter has different encoding. I don’t want to encode both, but the shorter, and I would like to take the codec settings from the longer stream, and then concat them with command similar to :

  ffmpeg -f concat -i list.txt -c copy output.mkv

  Where list.txt contains :

  file properly-encoded-shorter-stream.mkv
  
  file longer-stream.mkv

  Audio streams are not problematic, both are uncompressed PCM wav.
  Details of my media files (3.avi was produced with avisynth / wine / virtualdub, the other mkv files are taken from a media file)

  ffmpeg -i 3.avi -i 5.mkv 
  
  ffmpeg version 2.3.1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jul 31 2014 14:53:16 with gcc 4.9.1 (GCC)
  
    configuration: --prefix=/usr --disable-debug --disable-static --enable-avisynth --enable-avresample --enable-decoder=atrac3 --enable-decoder=atrac3p --enable-dxva2 --enable-fontconfig --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-pic --enable-postproc --enable-runtime-cpudetect --enable-shared --enable-swresample --enable-vdpau --enable-version3 --enable-x11grab
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libavresample   1.  3.  0 /  1.  3.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [matroska,webm @ 0x84e3100] Unknown entry 0x1A45DFA3
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, matroska,webm, from '3.avi':
  
    Metadata:
  
      encoder         : libebml-0.7.5 & libmatroska-0.7.7
  
      creation_time   : 2014-08-04 23:08:59
  
    Duration: 00:00:01.03, start: 0.000000, bitrate: 153515 kb/s
  
      Stream #0:0(eng): Video: rawvideo, bgr24, 528x400, SAR 1:1 DAR 33:25, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
  Guessed Channel Layout for  Input Stream #1.1 : stereo
  
  Input #1, matroska,webm, from '5.mkv':
  
    Metadata:
  
      encoder         : libebml-0.7.5 & libmatroska-0.7.7
  
      creation_time   : 2014-08-04 22:45:57
  
    Duration: 00:06:18.45, start: 0.000000, bitrate: 3219 kb/s
  
      Stream #1:0(eng): Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 528x400 [SAR 1:1 DAR 33:25], 29.97 fps, 29.97 tbr, 1k tbn, 29.98 tbc (default)
  
      Stream #1:1(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s (default)

• using X264 and librtmp to send live camera frame, but the flash can't show

  9 mai 2016, par brian_wang

  I am using X264 and librtmp to send my live camera frame, all the things seems right. but my web test flash can’t show the correct video. Sometimes it seems correct, but when I re-click play button, it doesn’t show any picture on the flash.

  Here is my X264 config code

  x264_param_default_preset(&x264param, "ultrafast", "zerolatency");
  
  x264param.i_threads = 2;
  
  x264param.i_width = width;
  
  x264param.i_height = height;
  
  x264param.i_log_level = X264_LOG_DEBUG;
  
  x264param.i_fps_num = x264param.i_timebase_num= fps;
  
  x264param.i_fps_den = x264param.i_timebase_den=1;
  
  x264param.i_frame_total = 0;
  
  
  
  x264param.i_frame_reference =1;
  
  //x264param.i_frame_reference = 2;
  
  x264param.i_keyint_min = 25;
  
  x264param.i_keyint_max = fps*3;
  
  x264param.i_scenecut_threshold = 40;
  
  
  
  x264param.b_deblocking_filter = 1;
  
  x264param.b_cabac = 0;
  
  x264param.analyse.i_trellis = 0;
  
  x264param.analyse.b_chroma_me = 1;
  
  
  
  x264param.vui.i_sar_width = 0;
  
  x264param.vui.i_sar_height = 0;
  
  x264param.i_bframe_bias = 0;
  
  x264param.b_interlaced= 0;
  
  x264param.analyse.i_subpel_refine = 6; /* 0..5 -> 1..6 */
  
  x264param.analyse.i_me_method = X264_ME_DIA;//X264_ME_HEX?X264_ME_DIA
  
  x264param.analyse.i_me_range = 16;
  
  x264param.analyse.i_direct_mv_pred = X264_DIRECT_PRED_AUTO;
  
  x264param.i_deblocking_filter_alphac0 = 0;
  
  x264param.i_deblocking_filter_beta = 0;
  
  //x264param.analyse.intra = X264_ANALYSE_I4x4;
  
  x264param.analyse.intra = X264_ANALYSE_I4x4;//  | X264_ANALYSE_PSUB16x16 | X264_ANALYSE_BSUB16x16;
  
  x264param.analyse.inter = X264_ANALYSE_I4x4 | X264_ANALYSE_PSUB16x16 | X264_ANALYSE_BSUB16x16; 
  
  //edit 2014-7-28
  
  x264param.analyse.b_transform_8x8 = 1;
  
  //x264param.analyse.b_transform_8x8 = 0;
  
  x264param.analyse.b_fast_pskip = 1;
  
  x264param.i_bframe = 0;
  
  //x264param.b_intra_refresh
  
  x264param.analyse.b_weighted_bipred = 0;
  
  
  
  //// Intra refres:
  
  x264param.i_keyint_max = 250;
  
  x264param.b_intra_refresh = 0;
  
  ////Rate control:
  
  //x264param.rc.i_rc_method = X264_RC_CRF;
  
  
  
  //Rate Control
  
  x264param.rc.f_ip_factor = 1.4f;
  
  x264param.rc.f_pb_factor = 1.3f;
  
  x264param.rc.f_qcompress = 1.0;
  
  x264param.rc.i_qp_min = 20;//20;
  
  x264param.rc.i_qp_max = 32;
  
  x264param.rc.i_qp_step = 1;
  
  
  
  switch (0)
  
  {
  
  case 0: /* 1 PASS ABR */
  
      x264param.rc.i_rc_method = X264_RC_ABR;
  
      x264param.rc.i_bitrate = 300; // max = 5000
  
      x264param.rc.b_mb_tree = 0;
  
      break;
  
  case 1: /* 1 PASS CQ */
  
      x264param.rc.i_rc_method = X264_RC_CQP;
  
      x264param.rc.i_qp_constant = 26;//10 - 51
  
      break;
  
  }
  
  
  
  //For streaming:
  
  x264param.b_repeat_headers = 1;
  
  x264param.b_annexb = 1;
  
  x264_param_apply_profile(&x264param, "baseline");
  
  encoder = x264_encoder_open(&x264param);
  
  x264_picture_init( &pic_in );
  
  x264_picture_alloc(&pic_in, X264_CSP_I420, width, height);
  
  
  
  pic_in.img.i_csp = X264_CSP_I420|X264_CSP_VFLIP;
  
  pic_in.img.i_plane = 3;
  
  pic_in.i_type = X264_TYPE_AUTO;

  Sending To RTMP :

  sws_scale(convertCtx,&a,&scribe,0,height, pic_in.img.plane, pic_in.img.i_stride);
  
  int i_nal;
  
  int i_frame_size = x264_encoder_encode( encoder, &nal, &i_nal, &pic_in, &pic_out );
  
  if(i_frame_size <= 0){
  
      printf("\t!!!FAILED encode frame \n");
  
  }else{
  
      for (int i = 0,last=0; i < i_nal;i++)  
  
      {
  
          fwrite(nal[i].p_payload, 1, i_frame_size-last, fpw1);
  
          if (nal[i].i_type == NAL_SPS) {
  
              sps_len = nal[i].i_payload-4;
  
              sps  = new unsigned char[sps_len];
  
              memcpy(sps,nal[i].p_payload+4,sps_len);
  
          } else if (nal[i].i_type == NAL_PPS) {
  
              pps_len = nal[i].i_payload-4;
  
              pps  = new unsigned char[sps_len];
  
              memcpy(pps,nal[i].p_payload+4,pps_len);
  
              send_video_sps_pps(); 
  
              free(sps);
  
              free(pps);
  
          } else {
  
              send_rtmp_video(nal[i].p_payload,i_frame_size-last);
  
              break;
  
          }
  
          last += nal[i].i_payload;
  
      }
  
  }

  Send PPS and SPS

  void send_video_sps_pps(){
  
  if(rtmp!= NULL){
  
      RTMPPacket * packet;
  
      unsigned char * body;
  
      int i;
  
  
  
      packet = (RTMPPacket *)malloc(RTMP_HEAD_SIZE+1024);
  
      memset(packet,0,RTMP_HEAD_SIZE);
  
  
  
      packet->m_body = (char *)packet + RTMP_HEAD_SIZE;
  
      body = (unsigned char *)packet->m_body;
  
      i = 0;
  
      body[i++] = 0x17;
  
      body[i++] = 0x00;
  
  
  
      body[i++] = 0x00;
  
      body[i++] = 0x00;
  
      body[i++] = 0x00;
  
  
  
      /*AVCDecoderConfigurationRecord*/
  
      body[i++] = 0x01;
  
      body[i++] = sps[1];
  
      body[i++] = sps[2];
  
      body[i++] = sps[3];
  
      body[i++] = 0xff;
  
  
  
      /*sps*/
  
      body[i++]   = 0xe1;
  
      body[i++] = (sps_len >> 8) & 0xff;
  
      body[i++] = sps_len & 0xff;
  
      memcpy(&body[i],sps,sps_len);
  
      i +=  sps_len;
  
  
  
      /*pps*/
  
      body[i++]   = 0x01;
  
      body[i++] = (pps_len >> 8) & 0xff;
  
      body[i++] = (pps_len) & 0xff;
  
      memcpy(&body[i],pps,pps_len);
  
      i +=  pps_len;
  
  
  
      packet->m_packetType = RTMP_PACKET_TYPE_VIDEO;
  
      packet->m_nBodySize = i;
  
      packet->m_nChannel = 0x04;
  
      packet->m_nTimeStamp = 0;
  
      packet->m_hasAbsTimestamp = 0;
  
      packet->m_headerType = RTMP_PACKET_SIZE_MEDIUM;
  
      packet->m_nInfoField2 = rtmp->m_stream_id;
  
  
  
      RTMP_SendPacket(rtmp,packet,TRUE);
  
      free(packet);   
  
      rtmp_start_time = GetTickCount();
  
  }else{
  
      std::cout<<"RTMP is not ready"<code>

  Send video Frame

  void send_rtmp_video(unsigned char * buf,int len){
  
  RTMPPacket * packet;
  
  long timeoffset = GetTickCount() - rtmp_start_time; 
  
  
  
  int type = buf[0]&0x1f;
  
  
  
  packet = (RTMPPacket *)malloc(RTMP_HEAD_SIZE+len+9);
  
  memset(packet,0,RTMP_HEAD_SIZE);
  
  
  
  packet->m_body = (char *)packet + RTMP_HEAD_SIZE;
  
  packet->m_nBodySize = len + 9;
  
  
  
  /*send video packet*/
  
  unsigned char *body = (unsigned char *)packet->m_body;
  
  memset(body,0,len+9);
  
  
  
  /*key frame*/
  
  body[0] = 0x27;
  
  if (type == NAL_SLICE_IDR) {
  
      body[0] = 0x17;
  
  }
  
  
  
  body[1] = 0x01;   /*nal unit*/
  
  body[2] = 0x00;
  
  body[3] = 0x00;
  
  body[4] = 0x00;
  
  
  
  body[5] = (len >> 24) & 0xff;
  
  body[6] = (len >> 16) & 0xff;
  
  body[7] = (len >>  8) & 0xff;
  
  body[8] = (len ) & 0xff;
  
  
  
  /*copy data*/
  
  memcpy(&body[9],buf,len);
  
  
  
  packet->m_hasAbsTimestamp = 0;
  
  packet->m_packetType = RTMP_PACKET_TYPE_VIDEO;
  
  if(rtmp != NULL){
  
      packet->m_nInfoField2 = rtmp->m_stream_id;
  
  }
  
  packet->m_nChannel = 0x04;
  
  packet->m_headerType = RTMP_PACKET_SIZE_LARGE;
  
  packet->m_nTimeStamp = timeoffset;
  
  
  
  if(rtmp != NULL){
  
      RTMP_SendPacket(rtmp,packet,TRUE);
  
  }
  
  free(packet);

  }

• Why am I getting an error for stream #0.1 ?

  30 juillet 2014, par Rob Avery IV

  I’m converting videos using ffmpeg-php. Here is my code :

      // Set our source file
  
      $srcFile = $uploadFilm.".".$film_type;
  
      $destFile = $uploadFilm;
  
      $ffmpegPath = "ffmpeg";
  
  
  
      // Create our FFMPEG-PHP class
  
      $ffmpegObj = new ffmpeg_movie($srcFile);
  
  
  
      // Save our needed variables
  
      $srcWidth = makeMultipleTwo($ffmpegObj->getFrameWidth());
  
      $srcHeight = makeMultipleTwo($ffmpegObj->getFrameHeight());
  
      $srcFPS = $ffmpegObj->getFrameRate();
  
      if($ffmpegObj->hasAudio()){
  
          $srcAB = intval($ffmpegObj->getAudioBitRate()/1000);
  
          $srcAR = $ffmpegObj->getAudioSampleRate();
  
      }else{
  
          $srcAB = 0;
  
          $srcAR = 0;
  
      }
  
  
  
      // Call our convert using exec()
  
      //$command = $ffmpegPath . " -i " . $srcFile . " -ar " . $srcAR . " -ab " . $srcAB . "k -f flv -s " . $srcWidth . "x" . $srcHeight . " " . $destFile;
  
      //$command = "whoami";
  
      $command = $ffmpegPath . ' -i ' .'"'. $srcFile . '" -ar ' . $srcAR . ' -ab ' . $srcAB . 'k -f flv -s ' . $srcWidth . 'x' . $srcHeight . ' "' . $destFile . '" 2>&1';
  
      $outputCommand = array();
  
      $status = 1;
  
      exec($command, $outputCommand, $status);

  The output gives out this error at the end :

  Error while opening encoder for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height

  I know that both $srcAB and $srcAR have values because this is the command this being ran :

  ffmpeg -i source -ar 48000 -ab 160k -f flv -s 1920x1080 destination

  Of course, after the command is executed, the "convert video" has a size 0, which means it didn’t convert it.

  What am I missing here ?

  EDIT : Here is my full output :

  FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Jul 18 2014 08:41:45 with gcc 4.4.7 20120313 (Red Hat 4.4.7-3)
  
    configuration: --enable-libmp3lame --disable-mmx --enable-shared
  
    libavutil     50.36. 0 / 50.36. 0
  
    libavcore      0.16. 1 /  0.16. 1
  
    libavcodec    52.108. 0 / 52.108. 0
  
    libavformat   52.93. 0 / 52.93. 0
  
    libavdevice   52. 2. 3 / 52. 2. 3
  
    libavfilter    1.74. 0 /  1.74. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/path/to/file/bbb_sunflower_1080p_30fps_normal.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1
  
      creation_time   : 2013-12-16 17:44:39
  
      title           : Big Buck Bunny, Sunflower version
  
      artist          : Blender Foundation 2008, Janus Bager Kristensen 2013
  
      comment         : Creative Commons Attribution 3.0 - http://bbb3d.renderfarming.net
  
      genre           : Animation
  
      composer        : Sacha Goedegebure
  
    Duration: 00:10:34.60, start: 0.000000, bitrate: 3481 kb/s
  
      Stream #0.0(und): Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 2998 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc
  
      Metadata:
  
        creation_time   : 2013-12-16 17:44:39
  
      Stream #0.1(und): Audio: mp3, 48000 Hz, 2 channels, s16, 160 kb/s
  
      Metadata:
  
        creation_time   : 2013-12-16 17:44:42
  
      Stream #0.2(und): Audio: ac3, 48000 Hz, 6 channels, s16, 320 kb/s
  
      Metadata:
  
        creation_time   : 2013-12-16 17:44:42
  
  [buffer @ 0x2231e20] w:1920 h:1080 pixfmt:yuv420p
  
  Output #0, flv, to '/path/to/file/bbb_sunflower_1080p_30fps_normal.flv':
  
      Stream #0.0(und): Video: flv, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 30 tbc
  
      Metadata:
  
        creation_time   : 2013-12-16 17:44:39
  
      Stream #0.1(und): Audio: libmp3lame, 48000 Hz, 6 channels, s16, 160 kb/s
  
      Metadata:
  
        creation_time   : 2013-12-16 17:44:42
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Error while opening encoder for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height