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• Video decoder on Cuda ffmpeg

  25 avril 2013, par Oleksandr Kyrpa

  I starting to implement custum video decoder that utilize cuda HW decoder to generate YUV frame for next to encode it.

  How can I fill "CUVIDPICPARAMS" struc ???
  Is it possible ?

  My algorithm are :

  For get video stream packet I'm use ffmpeg-dev libs avcodec, avformat...

  My steps :

  1) Open input file :

  avformat_open_input(&ff_formatContext,in_filename,nullptr,nullptr);

  2) Get video stream property's :

  avformat_find_stream_info(ff_formatContext,nullptr);

  3) Get video stream :

  ff_video_stream=ff_formatContext->streams[i];

  4) Get CUDA device and init it :

  cuDeviceGet(&cu_device,0);
  
  CUcontext cu_vid_ctx;

  5) Init video CUDA decoder and set create params :

  CUVIDDECODECREATEINFO *cu_decoder_info=new CUVIDDECODECREATEINFO;
  
  memset(cu_decoder_info,0,sizeof(CUVIDDECODECREATEINFO));
  
  ...
  
  cuvidCreateDecoder(cu_video_decoder,cu_decoder_info);

  6)Read frame data to AVpacket

  av_read_frame(ff_formatContext,ff_packet);

  AND NOW I NEED decode frame packet on CUDA video decoder, in theoretical are :

  cuvidDecodePicture(pDecoder,&picParams);

  BUT before I need fill CUVIDPICPARAMS

  CUVIDPICPARAMS picParams ;//=new CUVIDPICPARAMS ;
  memset(&picParams, 0, sizeof(CUVIDPICPARAMS)) ;

  HOW CAN I FILL "CUVIDPICPARAMS" struc ???
  
  
  
  typedef struct _CUVIDPICPARAMS
  
  {
  
      int PicWidthInMbs;      // Coded Frame Size
  
      int FrameHeightInMbs;   // Coded Frame Height
  
      int CurrPicIdx;         // Output index of the current picture
  
      int field_pic_flag;     // 0=frame picture, 1=field picture
  
      int bottom_field_flag;  // 0=top field, 1=bottom field (ignored if field_pic_flag=0)
  
      int second_field;       // Second field of a complementary field pair
  
      // Bitstream data
  
      unsigned int nBitstreamDataLen;        // Number of bytes in bitstream data buffer
  
      const unsigned char *pBitstreamData;   // Ptr to bitstream data for this picture (slice-layer)
  
      unsigned int nNumSlices;               // Number of slices in this picture
  
      const unsigned int *pSliceDataOffsets; // nNumSlices entries, contains offset of each slice within the bitstream data buffer
  
      int ref_pic_flag;       // This picture is a reference picture
  
      int intra_pic_flag;     // This picture is entirely intra coded
  
      unsigned int Reserved[30];             // Reserved for future use
  
      // Codec-specific data
  
      union {
  
          CUVIDMPEG2PICPARAMS mpeg2;          // Also used for MPEG-1
  
          CUVIDH264PICPARAMS h264;
  
          CUVIDVC1PICPARAMS vc1;
  
          CUVIDMPEG4PICPARAMS mpeg4;
  
          CUVIDJPEGPICPARAMS jpeg;
  
          unsigned int CodecReserved[1024];
  
      } CodecSpecific;
  
  } CUVIDPICPARAMS;
  
  
  
  typedef struct _CUVIDH264PICPARAMS
  
  {
  
      // SPS
  
      int log2_max_frame_num_minus4;
  
      int pic_order_cnt_type;
  
      int log2_max_pic_order_cnt_lsb_minus4;
  
      int delta_pic_order_always_zero_flag;
  
      int frame_mbs_only_flag;
  
      int direct_8x8_inference_flag;
  
      int num_ref_frames;             // NOTE: shall meet level 4.1 restrictions
  
      unsigned char residual_colour_transform_flag;
  
      unsigned char bit_depth_luma_minus8;    // Must be 0 (only 8-bit supported)
  
      unsigned char bit_depth_chroma_minus8;  // Must be 0 (only 8-bit supported)
  
      unsigned char qpprime_y_zero_transform_bypass_flag;
  
      // PPS
  
      int entropy_coding_mode_flag;
  
      int pic_order_present_flag;
  
      int num_ref_idx_l0_active_minus1;
  
      int num_ref_idx_l1_active_minus1;
  
      int weighted_pred_flag;
  
      int weighted_bipred_idc;
  
      int pic_init_qp_minus26;
  
      int deblocking_filter_control_present_flag;
  
      int redundant_pic_cnt_present_flag;
  
      int transform_8x8_mode_flag;
  
      int MbaffFrameFlag;
  
      int constrained_intra_pred_flag;
  
      int chroma_qp_index_offset;
  
      int second_chroma_qp_index_offset;
  
      int ref_pic_flag;
  
      int frame_num;
  
      int CurrFieldOrderCnt[2];
  
      // DPB
  
      CUVIDH264DPBENTRY dpb[16];          // List of reference frames within the DPB
  
      // Quantization Matrices (raster-order)
  
      unsigned char WeightScale4x4[6][16];
  
      unsigned char WeightScale8x8[2][64];
  
      // FMO/ASO
  
      unsigned char fmo_aso_enable;
  
      unsigned char num_slice_groups_minus1;
  
      unsigned char slice_group_map_type;
  
      signed char pic_init_qs_minus26;
  
      unsigned int slice_group_change_rate_minus1;
  
      union
  
      {
  
          unsigned long long slice_group_map_addr;
  
          const unsigned char *pMb2SliceGroupMap;
  
      } fmo;
  
      unsigned int  Reserved[12];
  
      // SVC/MVC
  
      union
  
      {
  
          CUVIDH264MVCEXT mvcext;
  
          CUVIDH264SVCEXT svcext;
  
      };
  
  } CUVIDH264PICPARAMS;

• avfilter/af_apsyclip : fix peak overestimation

  29 janvier 2022, par Jason Jang

  avfilter/af_apsyclip : fix peak overestimation
  Ignore more samples that are near the edge of the block. The reason
  
  is that the filtering tends to cause these samples to go above the
  
  window more than the samples near the middle. If these samples are
  
  included in the unwindowed peak estimation, the peak can be
  
  overestimated. Because the block is windowed again before
  
  overlapping, overshoots near the edge of the block are not very
  
  important.
  0.1 is the value from the version originally contributed to calf.
  Signed-off-by : Jason Jang <jcj83429@gmail.com>
  

  • [DH] libavfilter/af_apsyclip.c

• In some cases, the value of FFmpegMSS is null

  16 février 2018, par Sanhei

  Uri uri = new Uri("https://cloud189-nj.oos-js.ctyunapi.cn/68e09e6a-3a50-4f7b-ba59-968d61dcb771?response-content-type=video/mp4&Expires=1518683112&response-content-disposition=attachment%3Bfilename%3D%22%5BUHA-WINGS%5D%5BKakegurui%5D%5B01%5D%5B720p%5D%5BGB%5D.mp4%22&AWSAccessKeyId=ad2d051c334eb8bbf4c1&Signature=22RXF7qDozpBQNl44/QVx62Anv4%3D");
  
  var FFmpegMSS = FFmpegInteropMSS.CreateFFmpegInteropMSSFromUri(uri, true, true);

  When the value of uri is "http://edge.ivideo.sina.com.cn/31451018.flv?KID=sina,viask&Expires=1518796800&ssig=7zn7dHMQVK",the program can run normally

  What is the difference between them ?
  How do I modify the code to make ffmpeg work properly ?

  My English is not good, I’m sorry for the inconvenience.