Newest 'libx264' Questions - Stack Overflow

Les articles publiés sur le site

• Streaming output of x264_encoder_encode

  11 octobre 2013, par user2660369

  how can I stream the output of x264_encoder_encode over UDP?

  This is my Init_x264-function:

  x264_param_t param;
  x264_param_default_preset(&param, "veryfast", "zerolatency");
  param.i_threads = 1;
  param.i_width = width;
  param.i_height = height;
  param.i_fps_num = 30;
  param.i_fps_den = 1;
  
  param.i_keyint_max = 30;
  param.b_intra_refresh = 1;
  
  param.rc.i_rc_method = X264_RC_CRF;
  param.rc.f_rf_constant = 25;
  param.rc.f_rf_constant_max = 35;
  
  param.b_annexb = 1;
  param.b_repeat_headers = 1;
  
  param.i_log_level = X264_LOG_DEBUG;
  
  x264_param_apply_profile(&param, "baseline");
  
  encoder = x264_encoder_open(&param);
  
  picIn = new x264_picture_t;
  picOut = new x264_picture_t;
  x264_picture_alloc(picIn, X264_CSP_I420, width, height);
  x264_encoder_parameters(encoder, &param);
  

  Now instead of saving the output of x264_encoder_encode to disk (using fwrite) I tried to just send it over UDP to my destination. I tried to play it with avplay, but it fails:

  [h264 @ 0x7f83f0012e80] non-existing PPS 0 referenced
  [h264 @ 0x7f83f0012e80] decode_slice_header error
  [h264 @ 0x7f83f0012e80] no frame!
  [h264 @ 0x7f83f0012e80] non-existing PPS 0 referenced
  [h264 @ 0x7f83f0012e80] decode_slice_header error
  [h264 @ 0x7f83f0012e80] no frame!
  

  With vlc I got different error messages, mostly about missing headers.

• Use ActionScript and Lib Flash to Record h.264 Webcam In Browser w/o Media Server ?

  10 octobre 2013, par Jake Steele

  Was wondering if its possible to use ActionScript and maybe wrap libx264 to record and encode a video inside the browser in h.264 format for playback.

  If anyone has any examples of something close to this please hook me up!

• libx264 - Setting up AVCodecContext for HD & SD capturing

  8 octobre 2013, par moose

  I'm trying to configure the AVCodecContext properly in order to capture HD in real-time (1080i) and SD (720 x 576) - also interlaced. I'm using libx264 with the ffmpeg static lib on Windows OS. If anybody can help with flags, gop_size, max_b_frames and all other AVCodecContext's members...

  For example, I guess I should have CODEC_FLAG_INTERLACED_ME | CODEC_FLAG_INTERLACED_DCT flags set. However, what I need is the whole story on how to set all this up.

• X264 Decoder complete frame not come in one NAL Unit

  8 octobre 2013, par user894554

  I am using libX264 library for encoding purpose . After encoding data is in form of NAL Unit ()..... .This is same format( AVC) what I require but problem is one frame come in two Nal Unit ( One frame = (length,data) + (length,data) ) and i need ( One frame = (length,data) in single nal unit).While I am converting into file then play , it show first upper part of screen and then lower . My config parameter are below

  param.i_width = 1680//;
  param.i_height = 948;
  param.i_fps_num = some no;
  param.i_fps_den = 1;
  param.i_keyint_max = 1 ;
  param.rc.i_rc_method = //;
  param.rc.f_rf_constant = //;
  param.rc.f_rf_constant_max = //;
  param.rc.b_mb_tree = 1;
  param.rc.i_vbv_max_bitrate = ; // Convert to Kbps
  param.rc.i_vbv_buffer_size = param.rc.i_vbv_max_bitrate / param.i_fps_num;
  param.b_repeat_headers = 0;
  param.b_annexb = 0;
  

• Whats the difference between the output of mencoder and libx264 ?

  30 septembre 2013, par عبدالمؤمن كاظم

  i want to know the difference between video output of these two encoders (mencoder and libx264). i guess they're not, since the video information of the codec have different names. thanks in advance.