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• How to achieve 2 pass encoding using x264 ?

  6 avril 2017, par Kim Kardashian

  is there a parameter in the x264_param_t structure
  or do I have to send frames to x264 dll twice.. ?
  Because I just use encoder_encode function and that returns nal units .
  Im guessing it should be a combination of a parameter and using encoder_encode twice.

  Here is how i initialize params and link to libx264

      InitializeSettings(){
  
      x264_param_default_preset(&m_pXParam, "medium", "zerolatency");
  
      x264_param_apply_profile(&m_pXParam, "baseline");
  
      m_pXParam.i_width = cx;
  
      m_pXParam.i_height = cy;
  
      m_pXParam.i_fps_num = fps;
  
      m_pXParam.i_fps_den = 1;
  
      // rate control
  
      m_pXParam.i_keyint_max = fps - 5;
  
      //m_pXParam.rc.f_rf_constant_max = fps + 5;
  
      // rate control
  
      m_pXParam.rc.i_qp_constant=18;
  
      m_pXParam.rc.i_qp_min=18;
  
      m_pXParam.rc.i_qp_max=18;}
  
  
  
      x264_picture_alloc(&m_xPicture, X264_CSP_I420 , m_pXParam.i_width, m_pXParam.i_height);
  
      m_xPicture.img = x264img;
  
      m_iframe_size = x264_encoder_encode(m_xEncoder, &m_xNals, &m_iNal, &m_xPicture, &m_xPictureOut);  

  @nobody555 Thanks ! I had another question about x264_param_apply_fastfirstpass function :

  /* x264_param_apply_fastfirstpass:
  
   *      If first-pass mode is set (rc.b_stat_read == 0, rc.b_stat_write == 1),
  
   *      modify the encoder settings to disable options generally not useful on
  
   *      the first pass. */

  what options are they talking about ?

• ffmpeg : Invalid segment filename template 'stream05d.ts'

  14 juin 2015, par Wildan Muhlis

  I have tried to use http live streaming with ffmpeg windows build (http://ffmpeg.zeranoe.com/builds/)

  Here’s the command

  ffmpeg.exe -v 9 -loglevel 99 -re -i tes.avi -an ^
  
  -c:v libx264 -b:v 128k -preset medium ^
  
  -flags -global_header -map 0 -f segment -segment_time 4 ^
  
  -segment_list test.m3u8 -segment_format mpegts stream%^05d.ts

  but an error message raised,

  [segment @ 045f5840] Codec for stream 0 does not use global headers but container format requires global headers
  
  [segment @ 045f5840] Selected stream id:0 type:video
  
  [mpegts @ 062f2540] Invalid segment filename template 'stream05d.ts'
  
  [AVIOContext @ 04a90e00] Statistics: 0 seeks, 0 writeouts
  
  Output #0, segment, to 'stream05d.ts':
  
    Metadata:
  
      encoder         : Lavf55.2.100
  
      Stream #0:0, 0, 1/90000: Video: h264, yuv420p, 720x400 [SAR 1:1 DAR 9:5], 10
  
  01/24000, q=-1--1, 128 kb/s, 90k tbn, 23.98 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 -> libx264)
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invali
  
  d argument
  
  [AVIOContext @ 0215a3e0] Statistics: 3028576 bytes read, 88 seeks

  What’s this error message mean and how to solve it ?

• x264_encoder_open always return null

  16 mai 2013, par chinayin

  this is my code

  x264_param_default(&m_X264Param) ;

  nRet = x264_param_default_preset(&m_X264Param,"medium","zerolatency") ;
  
  if (nRet)
  
  {
  
      return -1;
  
  }
  
  if (cpMain == Param.nProfile)
  
  {
  
      nRet = x264_param_apply_profile(&m_X264Param,"main") ;
  
  }
  
  else if (cpSimple == Param.nProfile)
  
  {
  
      nRet = x264_param_apply_profile(&m_X264Param,"baseline") ;
  
  }
  
  else if (cpComplex == Param.nProfile)
  
  {
  
      nRet = x264_param_apply_profile(&m_X264Param,"high");
  
  }
  
  if (nRet)
  
  {
  
      return -1;
  
  }
  
  m_X264Param.i_width = Param.nWidth ;
  
  m_X264Param.i_height = Param.nHeight ;
  
  m_X264Param.i_threads = X264_THREADS_AUTO ;
  
  m_X264Param.i_log_level = X264_LOG_NONE ;
  
  m_X264Param.rc.i_bitrate = Param.nBitRate ;
  
  m_X264Param.rc.i_rc_method = X264_RC_ABR ;
  
  m_X264Param.i_csp          =  X264_CSP_I420 ;

  m_pX264Handle = x264_encoder_open(&m_X264Param) ;

  but it always return null it is my first time use it did i miss some key param ? is anyone who can tell me the answer ! thank you very much and best regards