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• hardware acceleration for ffmpeg is not working

  21 novembre 2019, par tempMailisAwesome

  I download cuda driver for my nvidia

  but it still does not use my GPU, it still using cpu.

  how can i make it use GPU.

  i heard about hardware acceleration as well but thats not working.

  It has to be h.264

• How to compile FFMpeg with older NVEnc ?

  20 décembre 2019, par dabei

  I get this error when running FFMpeg with NVEnc.

  [h264_nvenc @ 0x2a27d00] Driver does not support the required nvenc API version. Required: 9.1 Found: 9.0
  
  [h264_nvenc @ 0x2a27d00] The minimum required Nvidia driver for nvenc is 435.21 or newer

  I can’t upgrade the driver to latest version because I’m limited by what’s supported in GKE.

• ffmpeg nvenc encode too slow

  13 août 2016, par sweetsource

  i use ffmpeg 3.1 compile with nvenc,when i run the ffmpeg encode example like this：

  #include 
  
  
  
  #include <libavutil></libavutil>opt.h>
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavutil></libavutil>channel_layout.h>
  
  #include <libavutil></libavutil>common.h>
  
  #include <libavutil></libavutil>imgutils.h>
  
  #include <libavutil></libavutil>mathematics.h>
  
  #include <libavutil></libavutil>samplefmt.h>
  
  #include <ace></ace>ace_os.h>
  
  
  
  #define INBUF_SIZE 4096
  
  #define AUDIO_INBUF_SIZE 20480
  
  #define AUDIO_REFILL_THRESH 4096
  
  
  
  
  
  
  
  /*
  
   * Video encoding example
  
   */
  
  static void video_encode_example(const char *filename, const char* codec_name)
  
  {
  
      AVCodec *codec;
  
      AVCodecContext *c= NULL;
  
      int i, ret, x, y, got_output;
  
      ACE_INT64 nstart,nend;
  
      FILE *f;
  
      AVFrame *frame;
  
      AVPacket pkt;
  
      uint8_t endcode[] = { 0, 0, 1, 0xb7 };
  
  
  
      printf("Encode video file %s\n", filename);
  
  
  
      /* find the video encoder */
  
      codec = avcodec_find_encoder_by_name(codec_name);
  
      if (!codec) {
  
          fprintf(stderr, "Codec not found\n");
  
          exit(1);
  
      }
  
  
  
      c = avcodec_alloc_context3(codec);
  
      if (!c) {
  
          fprintf(stderr, "Could not allocate video codec context\n");
  
          exit(1);
  
      }
  
  
  
      /* put sample parameters */
  
      c->bit_rate = 400000;
  
      /* resolution must be a multiple of two */
  
      c->width = 352;
  
      c->height = 288;
  
      /* frames per second */
  
      c->time_base = (AVRational){1,25};
  
      /* emit one intra frame every ten frames
  
       * check frame pict_type before passing frame
  
       * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
  
       * then gop_size is ignored and the output of encoder
  
       * will always be I frame irrespective to gop_size
  
       */
  
      c->gop_size = 25;
  
      c->max_b_frames = 0;
  
      c->thread_count = 1;
  
      c->refs = 4;
  
      c->pix_fmt = AV_PIX_FMT_YUV420P;
  
  
  
      if(!strcmp(codec_name,"libx264")
  
      {
  
          av_opt_set(c->priv_data, "preset", "superfast", 0);
  
          av_opt_set(c->priv_data, "tune", "zerolatency", 0);
  
      }
  
  
  
      if(!strcmp(codec_name,"h264_nvenc")
  
      {
  
          av_opt_set(m_pEncodeCtx->priv_data, "gpu","any",0);
  
          av_opt_set(m_pEncodeCtx->priv_data, "preset", "llhp", 0);
  
          av_opt_set(m_pEncodeCtx->priv_data,"profile","main",0);
  
          m_pEncodeCtx->refs = 0;
  
          m_pEncodeCtx->flags = 0;
  
          m_pEncodeCtx->qmax = 31;
  
          m_pEncodeCtx->qmin = 2;
  
      }
  
  
  
      /* open it */
  
      if (avcodec_open2(c, codec, NULL) &lt; 0) {
  
          fprintf(stderr, "Could not open codec\n");
  
          exit(1);
  
      }
  
  
  
      f = fopen(filename, "wb");
  
      if (!f) {
  
          fprintf(stderr, "Could not open %s\n", filename);
  
          exit(1);
  
      }
  
  
  
      frame = av_frame_alloc();
  
      if (!frame) {
  
          fprintf(stderr, "Could not allocate video frame\n");
  
          exit(1);
  
      }
  
      frame->format = c->pix_fmt;
  
      frame->width  = c->width;
  
      frame->height = c->height;
  
  
  
      /* the image can be allocated by any means and av_image_alloc() is
  
       * just the most convenient way if av_malloc() is to be used */
  
      ret = av_image_alloc(frame->data, frame->linesize, c->width, c->height,
  
                           c->pix_fmt, 32);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Could not allocate raw picture buffer\n");
  
          exit(1);
  
      }
  
  
  
      /* encode 1 second of video */
  
      for (i = 0; i &lt; 25; i++) {
  
          av_init_packet(&amp;pkt);
  
          pkt.data = NULL;    // packet data will be allocated by the encoder
  
          pkt.size = 0;
  
  
  
          fflush(stdout);
  
          /* prepare a dummy image */
  
          /* Y */
  
          for (y = 0; y &lt; c->height; y++) {
  
              for (x = 0; x &lt; c->width; x++) {
  
                  frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
  
              }
  
          }
  
  
  
          /* Cb and Cr */
  
          for (y = 0; y &lt; c->height/2; y++) {
  
              for (x = 0; x &lt; c->width/2; x++) {
  
                  frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;
  
                  frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;
  
              }
  
          }
  
  
  
          frame->pts = i;
  
  
  
          /* encode the image */
  
          nstart = ACE_OS::gettimeofday().get_msec();
  
          ret = avcodec_encode_video2(c, &amp;pkt, frame, &amp;got_output);
  
          if (ret &lt; 0) {
  
              fprintf(stderr, "Error encoding frame\n");
  
              exit(1);
  
          }
  
  
  
          if (got_output) {
  
              printf("%s take time:%d\n",codec_name,ACE_OS::gettimeofday().get_msec()-nstart);
  
              printf("Write frame %3d (size=%5d)\n", i, pkt.size);
  
              fwrite(pkt.data, 1, pkt.size, f);
  
              av_packet_unref(&amp;pkt);
  
          }
  
      }
  
  
  
      /* get the delayed frames */
  
      for (got_output = 1; got_output; i++) {
  
          fflush(stdout);
  
  
  
          ret = avcodec_encode_video2(c, &amp;pkt, NULL, &amp;got_output);
  
          if (ret &lt; 0) {
  
              fprintf(stderr, "Error encoding frame\n");
  
              exit(1);
  
          }
  
  
  
          if (got_output) {
  
              printf("Write frame %3d (size=%5d)\n", i, pkt.size);
  
              fwrite(pkt.data, 1, pkt.size, f);
  
              av_packet_unref(&amp;pkt);
  
          }
  
      }
  
  
  
      /* add sequence end code to have a real MPEG file */
  
      fwrite(endcode, 1, sizeof(endcode), f);
  
      fclose(f);
  
  
  
      avcodec_close(c);
  
      av_free(c);
  
      av_freep(&amp;frame->data[0]);
  
      av_frame_free(&amp;frame);
  
      printf("\n");
  
  }
  
  
  
  
  
  
  
  int main(int argc, char **argv)
  
  {
  
      const char *output_type;
  
  
  
      /* register all the codecs */
  
      avcodec_register_all();
  
      video_encode_example("test.h264", "h264_nvenc");
  
  
  
  
  
      return 0;
  
  }

  it encode one frame to a packet about 1800ms,this is too slow. I use Nvidia Grid K1.Is there some parameter error ? Thanke you very much