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• avfilter/chromaber_vulkan : use FF_ARRAY_ELEMS instead of magic number

  19 novembre 2021, par Wu Jianhua

  avfilter/chromaber_vulkan : use FF_ARRAY_ELEMS instead of magic number
  Signed-off-by : Wu Jianhua <jianhua.wu@intel.com>
  

  • [DH] libavfilter/vf_chromaber_vulkan.c

• avfilter/avgblur_vulkan : use FF_ARRAY_ELEMS instead of magic number

  19 novembre 2021, par Wu Jianhua

  avfilter/avgblur_vulkan : use FF_ARRAY_ELEMS instead of magic number
  Signed-off-by : Wu Jianhua <jianhua.wu@intel.com>
  

  • [DH] libavfilter/vf_avgblur_vulkan.c

• How to set the reference frame number correctly in ffmpeg x265

  8 mai 2020, par luodonghui1234

  I have a problem when using x265 in ffmpeg. The following code is that I use x265 params to set the reference frame number of P frame. I have checked the x265 document and set the — ref parameter to achieve the purpose I want, but it is invalid. The resolution of the encoded P frame header to num_negative_pics is always 2. I need to set this number to 1, that is to say, any P frame only needs to refer to the previous frame.

  



  m_cVideoCodeCtxt->flags |= AV_CODEC_FLAG_CLOSED_GOP;
m_cVideoCodeCtxt->rc_max_rate    = m_iRate;
m_cVideoCodeCtxt->rc_min_rate    = (int)m_iRate / 2;
m_cVideoCodeCtxt->rc_buffer_size = m_iRate;
m_cVideoCodeCtxt->bit_rate       = (int)m_iRate;

m_cVideoCodeCtxt->width          = 1920;    
m_cVideoCodeCtxt->height         = 1080;    
m_cVideoCodeCtxt->time_base      = { 1, 30 };
m_cVideoCodeCtxt->framerate      = { 30 ,1};
m_cVideoCodeCtxt->frame_number   = 1;  
m_cVideoCodeCtxt->gop_size       = 30; 
m_cVideoCodeCtxt->max_b_frames   = 0; 
m_cVideoCodeCtxt->thread_count   = 4;
m_cVideoCodeCtxt->pix_fmt        = pix_fmt;
m_cVideoCodeCtxt->codec_type     = AVMEDIA_TYPE_VIDEO;
m_cVideoCodeCtxt->codec_id       = m_fVideoFmCtxt->video_codec_id;
int ret = av_opt_set(m_cVideoCodeCtxt->priv_data, "preset", "ultrafast", 0);
ret = av_opt_set(m_cVideoCodeCtxt->priv_data, "tune", "zerolatency", 0);

CString cstrX265Parms = L"";
cstrX265Parms.Format(L"keyint=%d:ref=1:no-open-gop=1:weightp=1:b_pyramid=1:weightb=0:cutree=0:rc-lookahead=0:bframes=0:scenecut=0:b-adapt=0:repeat-headers=1:max-merge=1", m_iFrameRate);
USES_CONVERSION;
char* cX265Parms = W2A(cstrX265Parms);
ret = av_opt_set(m_cVideoCodeCtxt->priv_data, "x265-params", cX265Parms, 0);


  



  Is there a problem with my code ? Or need to cooperate with other parameter settings