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• How do I force an IDR-frame using the x264 C API ?

  28 octobre 2020, par Keith

  I am attempting to use an external bool signal to force the next encoded frame to be an IDR-frame using the x264 C API. I am using the "baseline" profile with the "ultrafast" and "zerolatency" presets. I tried to use the input pic settings prior to encoding, as in this code snippet, but this has not worked. My class Open() and Encode() methods are shown here. Any help will be appreciated.

  


  int X264Encoder::Open(void)
{
  if (_x264VideoEncoder != NULL)
    Close();

  // Set up default parameters.
  if (x264_param_default_preset(&_param, _encoderSpeedPreset.c_str(), "zerolatency") < 0)  // 0=success, -1=failed
    { _errStr = "X264Encoder::Open: Default parameter preset failed with " + _encoderSpeedPreset; return(0); }

  // Set non-default params.
  _param.i_bitdepth       = 8;
  _param.i_csp            = _colourSpaceMapping[_colourSpace]; // Input colour space
  if(!_param.i_csp)
    { _errStr = "X264Encoder::Open: Incompatible colour space " + to_string(_colourSpace); return(0); }
  _param.i_width          = _width;
  _param.i_height         = _height;
  _param.i_fps_num        = _videoRateNumerator;
  _param.i_fps_den        = _videoRateDenominator;

  _param.rc.i_bitrate     = _avgBitsPerSecond / 1000; // bitrate units are in kbits/s

  _param.i_threads        = 1;
  _param.b_vfr_input      = 0;  // VFR input.  If 1, use timebase and timestamps for ratecontrol purposes. If 0, use fps only.
  _param.b_repeat_headers = 1;  // Put SPS/PPS before each keyframe
  _param.b_annexb         = 1;  // If set, place start codes (4 bytes) before NAL units, otherwise place size (4 bytes) before NAL units.

  // Apply profile restrictions.
  if (x264_param_apply_profile(&_param, _profile.c_str()) < 0)  // 0=success, -1=failed
    { _errStr = "X264Encoder::Open: Unable to set profile " + _profile; return(0); }

  // Initialise the encoder input pic buffer.
  if (x264_picture_alloc(&_picIn, _param.i_csp, _param.i_width, _param.i_height) < 0)
    { _errStr = "X264Encoder::Open: Unable to alloc input picture buffer"; return(0); }
  _inPicIsAllocated = true;

  // Instantiate the encoder.
  _x264VideoEncoder = x264_encoder_open(&_param);
  if (_x264VideoEncoder == NULL)
  {
    _errStr = "X264Encoder::Open: Unable to instantiate the encoder"; 
    // Clean up before exit.
    x264_picture_clean(&_picIn);
    _inPicIsAllocated = false;
    return(0);
  }//end if !_x264VideoEncoder...

  // Frame counting for pts timestamps.
  _frameNum     = 0;
  _lastPicType  = 0; // IDR-frame

  d.clear();

  return(1);
}//end Open.

int X264Encoder::Encode(void* pSrc, void* pCmp, void* codeParameter)
{
  _encodedFrameSize = 0;

  // Validation house work.
  if(!Ready())
    { _errStr = "X264Encoder::Encode: Not ready"; return(0); }

  if(!pSrc || !pCmp)
    { _errStr = "X264Encoder::Encode: Invalid function parameter list"; return(0); }

  // Load input image. 
  if(_param.i_csp != X264_CSP_I420) // Can only process I420 input colour space.
    { _errStr = "X264Encoder::Encode: I420 colour space required"; return(0); }
  uint32_t lumSize = _width * _height;
  uint32_t chrSize = lumSize / 4;
  // Transfer the input source image into the x264 picture img structure.
  uint8_t* pImg = static_cast(pSrc);
  memcpy_s(_picIn.img.plane[0], lumSize, pImg, lumSize);
  pImg += lumSize;
  memcpy_s(_picIn.img.plane[1], chrSize, pImg, chrSize);
  pImg += chrSize;
  memcpy_s(_picIn.img.plane[2], chrSize, pImg, chrSize);

  // Encode single frame
  _picIn.i_pts = _frameNum;
  if (_idrFrameRequired) 
  {  
    _picIn.i_type = X264_TYPE_IDR; 
    //... and clear the signal.
    _idrFrameRequired = false; 
  }//end if _idrFrameRequired...
  else 
    _picIn.i_type = X264_TYPE_AUTO;

  _encodedFrameSize = x264_encoder_encode(_x264VideoEncoder, &_nal, &_nalCnt, &_picIn, &_picOut);
  if (_encodedFrameSize > 0)
  {
    // Write the encoded stream to the output.
    uint8_t* pOut = static_cast(pCmp);
    memcpy_s(pOut, _encodedFrameSize, _nal->p_payload, _encodedFrameSize);
  }//end else if _encodedFrameSize...
  else
    { _errStr = "X264Encoder::Encode: Encode process failed"; return(0); }

  _lastPicType = 1; // Non-IDR
  if (_picOut.i_type == X264_TYPE_IDR)
    _lastPicType = 0; // IDR

  d.push_back({ _encodedFrameSize, _lastPicType });

  _frameNum++;
  return(1);
}//end Encode...


  


• How do I force an IDR-frame using the x264 C API ?

  28 octobre 2020, par Keith

  I am attempting to use an external bool signal to force the next encoded frame to be an IDR-frame using the x264 C API. I am using the "baseline" profile with the "ultrafast" and "zerolatency" presets. I tried to use the input pic settings prior to encoding, as in this code snippet, but this has not worked. My class Open() and Encode() methods are shown here. Any help will be appreciated.

  


  int X264Encoder::Open(void)
{
  if (_x264VideoEncoder != NULL)
    Close();

  // Set up default parameters.
  if (x264_param_default_preset(&_param, _encoderSpeedPreset.c_str(), "zerolatency") < 0)  // 0=success, -1=failed
    { _errStr = "X264Encoder::Open: Default parameter preset failed with " + _encoderSpeedPreset; return(0); }

  // Set non-default params.
  _param.i_bitdepth       = 8;
  _param.i_csp            = _colourSpaceMapping[_colourSpace]; // Input colour space
  if(!_param.i_csp)
    { _errStr = "X264Encoder::Open: Incompatible colour space " + to_string(_colourSpace); return(0); }
  _param.i_width          = _width;
  _param.i_height         = _height;
  _param.i_fps_num        = _videoRateNumerator;
  _param.i_fps_den        = _videoRateDenominator;

  _param.rc.i_bitrate     = _avgBitsPerSecond / 1000; // bitrate units are in kbits/s

  _param.i_threads        = 1;
  _param.b_vfr_input      = 0;  // VFR input.  If 1, use timebase and timestamps for ratecontrol purposes. If 0, use fps only.
  _param.b_repeat_headers = 1;  // Put SPS/PPS before each keyframe
  _param.b_annexb         = 1;  // If set, place start codes (4 bytes) before NAL units, otherwise place size (4 bytes) before NAL units.

  // Apply profile restrictions.
  if (x264_param_apply_profile(&_param, _profile.c_str()) < 0)  // 0=success, -1=failed
    { _errStr = "X264Encoder::Open: Unable to set profile " + _profile; return(0); }

  // Initialise the encoder input pic buffer.
  if (x264_picture_alloc(&_picIn, _param.i_csp, _param.i_width, _param.i_height) < 0)
    { _errStr = "X264Encoder::Open: Unable to alloc input picture buffer"; return(0); }
  _inPicIsAllocated = true;

  // Instantiate the encoder.
  _x264VideoEncoder = x264_encoder_open(&_param);
  if (_x264VideoEncoder == NULL)
  {
    _errStr = "X264Encoder::Open: Unable to instantiate the encoder"; 
    // Clean up before exit.
    x264_picture_clean(&_picIn);
    _inPicIsAllocated = false;
    return(0);
  }//end if !_x264VideoEncoder...

  // Frame counting for pts timestamps.
  _frameNum     = 0;
  _lastPicType  = 0; // IDR-frame

  d.clear();

  return(1);
}//end Open.

int X264Encoder::Encode(void* pSrc, void* pCmp, void* codeParameter)
{
  _encodedFrameSize = 0;

  // Validation house work.
  if(!Ready())
    { _errStr = "X264Encoder::Encode: Not ready"; return(0); }

  if(!pSrc || !pCmp)
    { _errStr = "X264Encoder::Encode: Invalid function parameter list"; return(0); }

  // Load input image. 
  if(_param.i_csp != X264_CSP_I420) // Can only process I420 input colour space.
    { _errStr = "X264Encoder::Encode: I420 colour space required"; return(0); }
  uint32_t lumSize = _width * _height;
  uint32_t chrSize = lumSize / 4;
  // Transfer the input source image into the x264 picture img structure.
  uint8_t* pImg = static_cast(pSrc);
  memcpy_s(_picIn.img.plane[0], lumSize, pImg, lumSize);
  pImg += lumSize;
  memcpy_s(_picIn.img.plane[1], chrSize, pImg, chrSize);
  pImg += chrSize;
  memcpy_s(_picIn.img.plane[2], chrSize, pImg, chrSize);

  // Encode single frame
  _picIn.i_pts = _frameNum;
  if (_idrFrameRequired) 
  {  
    _picIn.i_type = X264_TYPE_IDR; 
    //... and clear the signal.
    _idrFrameRequired = false; 
  }//end if _idrFrameRequired...
  else 
    _picIn.i_type = X264_TYPE_AUTO;

  _encodedFrameSize = x264_encoder_encode(_x264VideoEncoder, &_nal, &_nalCnt, &_picIn, &_picOut);
  if (_encodedFrameSize > 0)
  {
    // Write the encoded stream to the output.
    uint8_t* pOut = static_cast(pCmp);
    memcpy_s(pOut, _encodedFrameSize, _nal->p_payload, _encodedFrameSize);
  }//end else if _encodedFrameSize...
  else
    { _errStr = "X264Encoder::Encode: Encode process failed"; return(0); }

  _lastPicType = 1; // Non-IDR
  if (_picOut.i_type == X264_TYPE_IDR)
    _lastPicType = 0; // IDR

  d.push_back({ _encodedFrameSize, _lastPicType });

  _frameNum++;
  return(1);
}//end Encode...


  


• FFmpeg - Save %{pts\:hms} in %variable% for saving as environment variable

  29 novembre 2020, par cmd_kevin

  After closing a video in ffplay I want that the last timestamp will saved as a value of an environment variable.

  


  To show the current timestamp in the playback window, I can use :

  


  ffplay -vf "drawtext=text='%{pts\:hms}'" input.mp4


  


  So there is a variable (%{pts\:hms}) for my purposes.

  


  To change the value of a variable (in my case %variable01%), I used :

  


  SET variable01=value


  


  To change the environment variable with %variable01%, I used : SETX environment_variable_01 %variable01%.

  


  My problem is that I can't use %{pts\:hms} to define %variable01% and echo %{pts\:hms} or SETX environment_variable_01 %{pts\:hms} didn't work.

  


  So I'm trying to transfer the %{pts\:hms} value to %variable01% but all of my attempts failed.

  


  What can I do to solve my problem ?

  


  I want this environment value to continue a video at the timestamp I closed ffplay and the command prompt.

  


  Edit1 : I have used search facility but I didn't find an answer, especially to this specific syntax with only one percent sign %{pts\:hms}.

  


  Here's my reproducible example :
ffplay -vf "drawtext=text='%{pts\:hms}'" input.mp4 & echo %{pts:hms}
Answer : %{pts\:hms}.

  


  I also tried :

  


  ffplay -vf "drawtext=text='%{pts\:hms}'" input.mp4 & SET variable01=%{pts\:hms}


  


  but the answer with

  


  echo %variable01%


  


  is

  


  %{pts\:hms}.


  


  Changing to %{pts\:hms}%didn't work too. The answer of echo is %{pts\:hms}%.