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• H264 decoding using ffmpeg with strange points in the decoded image

  16 septembre 2017, par ShaoQing

  I’m trying to decode H264 stream to YUV data using FFmpeg, then convert YUV data to RGB data by LibYUV, finally paint it. But some strange points (dots) appear. How to fix it ?

  Decoded Image

  

  av_init_packet(&m_avpkt);
  
  int cur_size;
  
  uint8_t *cur_ptr;
  
  while (true)
  
  {
  
      memset(outSampleBuffer, 0, IMAGE_BUFFER);
  
      long ret = m_pInputPortInfo->pPacketPool->receivePacket(outSampleBuffer, info);
  
      cur_size = info.size;
  
      cur_ptr = (uint8_t *)outSampleBuffer;
  
  
  
      if (m_de_context == NULL)
  
          continue;
  
  
  
      while (cur_size > 0)
  
      {
  
          int len = av_parser_parse2(
  
              pCodecParser, m_de_context,
  
              &m_avpkt.data, &m_avpkt.size,
  
              cur_ptr, cur_size,
  
              AV_NOPTS_VALUE, AV_NOPTS_VALUE, AV_NOPTS_VALUE);
  
  
  
          cur_ptr += len;
  
          cur_size -= len;
  
  
  
          if (m_avpkt.size == 0)
  
              continue;
  
          int got_picture = 0;
  
          int iOutLen = avcodec_decode_video2(m_de_context, m_de_frame, &got_picture, &m_avpkt);
  
          if (got_picture != 0)
  
          {
  
               //YUV to RGB
  
               //...
  
          }
  
  }

  In order to find which step is wrong, I save the H264 data before using avcodec_decode_video2 then save the YUV data after decoding. I found all the H264 data is correct and the YUV data is wrong, which is decoded by P frames, I frames decoded data is ok. Here is how i save the YUV data :

  int got_picture = 0;
  
  int iOutLen = avcodec_decode_video2(m_de_context, m_de_frame, &got_picture, &m_avpkt);
  
  if (got_picture != 0)
  
  {
  
      if (m_de_frame->format == AVPixelFormat::AV_PIX_FMT_YUV420P)
  
      {
  
          int y = m_de_frame->width*m_de_frame->height;
  
          int u = y / 4;
  
          int v = y / 4;
  
  
  
          uint8_t* y_ptr = m_de_frame->data[0];
  
          uint8_t* u_ptr = m_de_frame->data[1];
  
          uint8_t* v_ptr = m_de_frame->data[2];
  
  
  
          int yuvbufsize = y + u + v;
  
          char *buf = new char[yuvbufsize];
  
          memcpy(buf, y_ptr, y);
  
          memcpy(buf + y, u_ptr, u);
  
          memcpy(buf + y+u, v_ptr, v);
  
  
  
          static int count = 0;
  
          char yuvimgPath[MAX_PATH] = { 0 };
  
          sprintf(yuvimgPath, "d:\\images\\de_%d.yuv", count);
  
  
  
          FILE *fp1 = fopen(yuvimgPath, "wb");
  
          fwrite(buf, 1, yuvbufsize, fp1);
  
          fclose(fp1);
  
          count++;
  
  
  
          delete[]buf;
  
      }
  
  }

• ffmpeg linux command line conversion a folder with FLAC files in them to MP3 (v0 LAME quality) in another directory, not deleting the original FLACs [on hold]

  3 septembre 2017, par LT.Smash

  Maybe with the new folder is inside the original folder with the FLAC files, creating a directory named like the one with the flac files, except with (v0) at the end. It would be very useful for stuff that is on a VPS of mine without having to download the stuff home, use a gui application re-upload etc. I’m used to do some straightforward command line ffmpeg conversion for videos, but as you can see this is audio with many paramaters and I can’t get it to work and what I find here is great, but is only parts of what I’m looking for and also many seem to convert the flac files themselves, so they disappear and the mp3 remains.

• FFMPEG : Unable to find suitable output format for rtsp ://

  19 juillet 2017, par Hakeem El Bakka-lee

  I have a WebRTC server, streaming to a WebBrowser front-end.

  I feed my WebRtc Server a video and/or audio flux through FFMPEG.

  The problem is that I just can’t seem to make FFMPEG stream something in rtp/rtsp.

  Here is my line, wich comes from the FFMPEG website :

  ffmpeg -re -i rm.mp4 -f rtsp -muxdelay 0.1 rtsp://127.0.0.1/live.sdp

  I got erros like :

  Connection to tcp://127.0.0.1:554?timeout=0 failed: Connection refused
  
  Could not write header for output file #0 (incorrect codec parameters ?): Connection refused

  I modified the ffserver.conf file but nothing changed.

  Has anybody experienced the same problem ?