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• Why there is no AVFrame->data[2] data when decode h264 by ffmpeg use "h264_cuvid"

  27 juillet 2017, par Wu NL

  env : ubuntu 16.04 64 bit ; ffmpeg 3.3.2 build whih cuda cuvid libnpp...
  use ffmpeg cmd : ffmpeg -vsync 0 -c:v h264_cuvid -i test.264 -f rawvideo test.yuv works fine, the generated yuv file is ok.
  BUT When I decode this 264 file by my code use ’h264_cuvid’ decoder, something problem happens, this is my code :

  #include 
  
  
  
  #define __STDC_CONSTANT_MACROS
  
  
  
  #ifdef _WIN32
  
  //Windows
  
  extern "C"
  
  {
  
  #include "libavcodec/avcodec.h"
  
  };
  
  #else
  
  //Linux...
  
  #ifdef __cplusplus
  
  extern "C"
  
  {
  
  #endif
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #ifdef __cplusplus
  
  };
  
  #endif
  
  #endif
  
  
  
  
  
  //test different codec
  
  #define TEST_H264  1
  
  #define TEST_HEVC  0
  
  
  
  int main(int argc, char* argv[])
  
  {
  
      AVCodec *pCodec;
  
      AVCodecContext *pCodecCtx= NULL;
  
      AVCodecParserContext *pCodecParserCtx=NULL;
  
  
  
      FILE *fp_in;
  
      FILE *fp_out;
  
      AVFrame *pFrame;
  
  
  
      const int in_buffer_size=4096;
  
      unsigned char in_buffer[in_buffer_size + FF_INPUT_BUFFER_PADDING_SIZE]= {0};
  
      unsigned char *cur_ptr;
  
      int cur_size;
  
      AVPacket packet;
  
      int ret, got_picture;
  
  
  
  
  
  #if TEST_HEVC
  
      enum AVCodecID codec_id=AV_CODEC_ID_HEVC;
  
      char filepath_in[]="bigbuckbunny_480x272.hevc";
  
  #elif TEST_H264
  
      AVCodecID codec_id=AV_CODEC_ID_H264;
  
      char filepath_in[]="2_60_265to264.264";
  
  #else
  
      AVCodecID codec_id=AV_CODEC_ID_MPEG2VIDEO;
  
      char filepath_in[]="bigbuckbunny_480x272.m2v";
  
  #endif
  
  
  
      char filepath_out[]="mainSend.yuv";
  
      int first_time=1;
  
  
  
  
  
      //av_log_set_level(AV_LOG_DEBUG);
  
  
  
      avcodec_register_all();
  
  
  
  //    pCodec = avcodec_find_decoder(codec_id);
  
      pCodec = avcodec_find_decoder_by_name("h264_cuvid");
  
      if (!pCodec)
  
      {
  
          printf("Codec not found\n");
  
          return -1;
  
      }
  
      pCodecCtx = avcodec_alloc_context3(pCodec);
  
      if (!pCodecCtx)
  
      {
  
          printf("Could not allocate video codec context\n");
  
          return -1;
  
      }
  
  
  
      pCodecParserCtx=av_parser_init(pCodec->id);
  
      if (!pCodecParserCtx)
  
      {
  
          printf("Could not allocate video parser context\n");
  
          return -1;
  
      }
  
  
  
      if (avcodec_open2(pCodecCtx, pCodec, NULL) &lt; 0)
  
      {
  
          printf("Could not open codec\n");
  
          return -1;
  
      }
  
      //Input File
  
      fp_in = fopen(filepath_in, "rb");
  
      if (!fp_in)
  
      {
  
          printf("Could not open input stream\n");
  
          return -1;
  
      }
  
      //Output File
  
      fp_out = fopen(filepath_out, "wb");
  
      if (!fp_out)
  
      {
  
          printf("Could not open output YUV file\n");
  
          return -1;
  
      }
  
  
  
      pFrame = av_frame_alloc();
  
      av_init_packet(&amp;packet);
  
  
  
      while (1)
  
      {
  
  
  
          cur_size = fread(in_buffer, 1, in_buffer_size, fp_in);
  
          if (cur_size == 0)
  
              break;
  
          cur_ptr=in_buffer;
  
  
  
          while (cur_size>0)
  
          {
  
  
  
              int len = av_parser_parse2(
  
                            pCodecParserCtx, pCodecCtx,
  
                            &amp;packet.data, &amp;packet.size,
  
                            cur_ptr, cur_size,
  
                            AV_NOPTS_VALUE, AV_NOPTS_VALUE, AV_NOPTS_VALUE);
  
  
  
              cur_ptr += len;
  
              cur_size -= len;
  
  
  
              if(packet.size==0)
  
                  continue;
  
  
  
              //Some Info from AVCodecParserContext
  
              printf("[Packet]Size:%6d\t",packet.size);
  
              switch(pCodecParserCtx->pict_type)
  
              {
  
              case AV_PICTURE_TYPE_I:
  
                  printf("Type:I\tNumber:%4d\n",pCodecParserCtx->output_picture_number);
  
                  break;
  
              case AV_PICTURE_TYPE_P:
  
                  printf("Type:P\t");
  
                  break;
  
              case AV_PICTURE_TYPE_B:
  
                  printf("Type:B\t");
  
                  break;
  
              default:
  
                  printf("Type:Other\t");
  
                  break;
  
              }
  
              printf("Number:%4d\n",pCodecParserCtx->output_picture_number);
  
              AVFrame* myFrame = av_frame_alloc();
  
              ret = avcodec_decode_video2(pCodecCtx, myFrame, &amp;got_picture, &amp;packet);
  
              if (ret &lt; 0)
  
              {
  
                  printf("Decode Error.\n");
  
                  return ret;
  
              }
  
              if (got_picture)
  
              {
  
                  if(first_time)
  
                  {
  
                      printf("\nCodec Full Name:%s\n",pCodecCtx->codec->long_name);
  
                      printf("width:%d\nheight:%d\n\n",pCodecCtx->width,pCodecCtx->height);
  
                      first_time=0;
  
                  }
  
                  //Y, U, V
  
                  for(int i=0; iheight; i++)
  
                  {
  
                      fwrite(myFrame->data[0]+myFrag-g>linesize[0]*i,1,myFrame->width,fp_out);
  
                  }
  
                  for(int i=0; iheight/2; i++)
  
                  {
  
                      fwrite(myFrame->data[1]+myFrag-g>linesize[1]*i,1,myFrame->width/2,fp_out);
  
                  }
  
                  for(int i=0; iheight/2; i++)
  
                  {
  
                      fwrite(myFrame->data[2]+myFrag-g>linesize[2]*i,1,myFrame->width/2,fp_out);
  
                  }
  
  //                printf("pframe's width height %d %d\t key frame %d\n",myFrame->width,myFrame->height,myFrame->key_frame);
  
                  printf("Succeed to decode 1 frame!\n");
  
                  av_frame_free(&amp;myFrame);
  
              }
  
          }
  
  
  
      }
  
  
  
      fclose(fp_in);
  
      fclose(fp_out);
  
  
  
  
  
      av_parser_close(pCodecParserCtx);
  
  
  
      av_frame_free(&amp;pFrame);
  
      avcodec_close(pCodecCtx);
  
      av_free(pCodecCtx);
  
  
  
      return 0;
  
  }

  In this demo code, I call h264_cuvid by vcodec_find_decoder_by_name("h264_cuvid");
  BUT the code crash at fwrite(myFrame->data[2]+myFrag-g>linesize[2]*i,1,myFrame->width/2,fp_out);
  So after debug with codeblocks, I found that there is no data in myFrame->data[2] codeblocks watching window

  Any suggestion ? thanks !

• ffmpeg av_read_frame "Invalid data found"

  26 mai 2017, par DweebsUnited

  I am using ffmpeg to cut part of a file, following the remux example provided. However, I am having issues reading from files. I am given a file descriptor as input and an output filename, and can successfully set up the output file, read the stream info, copy all the streams, etc, etc. On the first call to av_read_frame though, I get an "Invalid data found when processing input" error. I have tried this with many different video files, and have not been able to get a single one to process correctly.

  Here is my code. I get no errors anywhere, except av_read_frame, which gives Invalid data found no matter what video file I give it.

  char path[512];
  
  sprintf(path, "pipe:%d", fileno(fp));
  
  
  
  
  
  AVOutputFormat *ofmt = NULL;
  
  AVFormatContext *ifmt_ctx = avformat_alloc_context(), *ofmt_ctx = NULL;
  
  AVPacket pkt;
  
  int ret, i;
  
  
  
  av_register_all();
  
  avcodec_register_all();
  
  
  
  if ((ret = avformat_open_input(&ifmt_ctx, path, av_find_input_format("mp4"), NULL)) < 0) {
  
      LOG("Could not open input file '%s'", path);
  
      goto end;
  
  }
  
  
  
  if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
  
      LOG("Failed to retrieve input stream information", "");
  
      goto end;
  
  }
  
  
  
  avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
  
  if (!ofmt_ctx) {
  
      LOG("Could not create output context\n");
  
      ret = AVERROR_UNKNOWN;
  
      goto end;
  
  }
  
  
  
  ofmt = ofmt_ctx->oformat;
  
  
  
  for (i = 0; i < ifmt_ctx->nb_streams; i++) {
  
      AVStream *in_stream = ifmt_ctx->streams[i];
  
      AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
  
  
  
      if (!out_stream) {
  
          LOG("Failed allocating output stream\n");
  
          goto end;
  
      }
  
  
  
      ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar);
  
      if (ret < 0) {
  
          LOG("Failed to copy context from input to output stream codec context\n");
  
          goto end;
  
      }
  
      out_stream->codecpar->codec_tag = 0;
  
  }
  
  
  
  if (!(ofmt->flags & AVFMT_NOFILE)) {
  
      ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
  
      if (ret < 0) {
  
          LOG("Could not open output file '%s'", out_filename);
  
          goto end;
  
      }
  
  }
  
  
  
  ret = avformat_write_header(ofmt_ctx, NULL);
  
  if (ret < 0) {
  
      LOG("Error occurred when opening output file\n");
  
      goto end;
  
  }
  
  
  
  //    int indexs[8] = {0};
  
  
  
  //    int64_t start_from = 8*AV_TIME_BASE;
  
  ret = av_seek_frame(ifmt_ctx, -1, from_seconds*AV_TIME_BASE, AVSEEK_FLAG_ANY);
  
  if (ret < 0) {
  
      LOG("Error seek\n");
  
      goto end;
  
  }
  
  
  
  int64_t *dts_start_from;
  
  int64_t *pts_start_from;
  
  dts_start_from = (int64_t *) malloc(sizeof(int64_t) * ifmt_ctx->nb_streams);
  
  memset(dts_start_from, 0, sizeof(int64_t) * ifmt_ctx->nb_streams);
  
  pts_start_from = (int64_t *) malloc(sizeof(int64_t) * ifmt_ctx->nb_streams);
  
  memset(pts_start_from, 0, sizeof(int64_t) * ifmt_ctx->nb_streams);
  
  
  
  while (1) {
  
      AVStream *in_stream, *out_stream;
  
  
  
      ret = av_read_frame(ifmt_ctx, &pkt);
  
      if (ret < 0)
  
          break;
  
  
  
      in_stream = ifmt_ctx->streams[pkt.stream_index];
  
      out_stream = ofmt_ctx->streams[pkt.stream_index];
  
  
  
      if (av_q2d(in_stream->time_base) * pkt.pts > end_seconds) {
  
          av_packet_unref(&pkt);
  
          break;
  
      }
  
  
  
      if (dts_start_from[pkt.stream_index] == 0)
  
          dts_start_from[pkt.stream_index] = pkt.dts;
  
      if (pts_start_from[pkt.stream_index] == 0)
  
          pts_start_from[pkt.stream_index] = pkt.pts;
  
  
  
      /* copy packet */
  
      pkt.pts = ::av_rescale_q_rnd(pkt.pts - pts_start_from[pkt.stream_index], in_stream->time_base, out_stream->time_base, (AVRounding) (AV_ROUND_NEAR_INF |
  
                                                                                                                                          AV_ROUND_PASS_MINMAX));
  
      pkt.dts = ::av_rescale_q_rnd(pkt.dts - dts_start_from[pkt.stream_index], in_stream->time_base, out_stream->time_base, (AVRounding) (AV_ROUND_NEAR_INF |
  
                                                                                                                                          AV_ROUND_PASS_MINMAX));
  
      if (pkt.pts < 0) {
  
          pkt.pts = 0;
  
      }
  
      if (pkt.dts < 0) {
  
          pkt.dts = 0;
  
      }
  
      pkt.duration = (int) av_rescale_q((int64_t) pkt.duration, in_stream->time_base, out_stream->time_base);
  
      pkt.pos = -1;
  
  
  
      ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
  
      if (ret < 0) {
  
          LOG("Error muxing packet\n");
  
          break;
  
      }
  
      av_packet_unref(&pkt);
  
  }
  
  free(dts_start_from);
  
  free(pts_start_from);
  
  
  
  av_write_trailer(ofmt_ctx);
  
  
  
  end:
  
  LOG("END");
  
  
  
  avformat_close_input(&ifmt_ctx);
  
  
  
  /* close output */
  
  if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
  
      avio_closep(&ofmt_ctx->pb);
  
  avformat_free_context(ofmt_ctx);
  
  
  
  if (ret < 0 && ret != AVERROR_EOF) {
  
      LOG("-- Error occurred: %s\n", av_err2str(ret));
  
      return 1;
  
  }

  Thank you for any help, I’m still getting used to ffmpeg. Did I miss some setting on the input ? Am I not setting something up that I need to be ? This problem is really stumping me.

• "Invalid data found when processing input" no matter the FFMPEG configuration

  25 mars 2017, par Jamie Bonnett

  I’ve been stumped on this for a while now, no matter the configuration if use in NodeJS I always get the same error "Error : ffmpeg exited with code 1".

  Here’s my code :

  var http = require('http');
  
  var fs = require('fs');
  
  var ffmpeg = require('fluent-ffmpeg');
  
  
  
  var server = http.createServer(function(req, res) {
  
  
  
      var seektime = 100;
  
      var pathToMovie = __dirname + '/src/video.mp4';
  
      var stat = fs.statSync(pathToMovie);
  
      res.writeHead(200, {
  
          'Content-Type': 'video/mp4',
  
          'Content-Length': stat.size
  
      });
  
  
  
      var proc = new ffmpeg(pathToMovie)
  
      .seekInput(seektime)
  
      .withVideoBitrate(1024)
  
      .withVideoCodec('libx264')
  
      .withAspect('16:9')
  
      .withFps(24)
  
      .toFormat('mp4');
  
  
  
      var ffstream = proc.pipe(res, {end:true});
  
      ffstream.on('data', function(chunk) {
  
          console.log('ffmpeg just wrote ' + chunk.length + ' bytes');
  
      });
  
  
  
  });
  
  server.listen(8000);

  I have no idea what to do now. Any ideas ?

  Thanks,
  Jamie