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• What's the reason of failed to read from input stream while playing in ffmpeg

  5 février 2016, par Long Bai

  I’m using ffmpeg library in qt compiled with mingw.
  I’m going to read from rtmp stream, process video frame and write to another rtmp stream.
  I refered ffmpeg examples and developed it.
  It works well with local video stream.
  But on the internet stream, it is failed to read from input stream after a few seconds playing.
  What’s the reason of this problem ?
  Thanks for your answer.

  Here is my code.
  as you can see the following, on the line "ret=av_read_frame(m_pInContext,&inPacket)" return negative value.

  while (!m_bAborted)
  
  // read stream.
  int64_t tstart = av_gettime_relative() ;
  ret = av_read_frame(m_pInContext, &inPacket) ;
  if (ret < 0)
  SetError("Failed to read input stream.") ;
  break ;
  //continue ;
  

      if (inPacket.stream_index == m_nVideoStreamIdx)
  
      {
  
          do
  
          {
  
              // decode frame.
  
              int decodedLen = DecodePacket(m_pInFrame, &inPacket, &got_frame, 1);
  
              if (decodedLen < 0)
  
                  break;
  
  
  
              if (got_frame)
  
              {
  
                  // convert frame from yuv420 to rgb24.
  
                  if (sws_ctx1)
  
                  {
  
                      sws_scale(sws_ctx1, m_pInFrame->data, m_pInFrame->linesize, 0, m_nHeight, pRawData, arrRawDataLineSize);
  
                  }
  
  
  
                  // image processing to remove the code and ads on video.
  
                  if (m_pListener)
  
                      m_pListener->OnFrame(pRawData[0], m_nWidth, m_nHeight, arrRawDataLineSize[0], AV_PIX_FMT_RGB24, 24);
  
  
  
                  // convert from rgb24 to yuv420 to write to the output stream.
  
                  if (sws_ctx2)
  
                  {
  
                      sws_scale(sws_ctx2, pRawData, arrRawDataLineSize, 0, m_nHeight, m_dst_picture.data, m_dst_picture.linesize);
  
                  }
  
  
  
                  // increase frame number.
  
                  frameCount ++;
  
  
  
                  // write to the output stream.
  
                  ret = WriteVideoFrame(m_pOutContext, m_pOutVideoStream, &frameCount);
  
                  if (ret < 0) {
  
                      if (sws_ctx2)
  
                          sws_freeContext(sws_ctx2);
  
                      sws_ctx2 = NULL;
  
                      CloseOutputStream();
  
  
  
                      SetError("Failed to write video stream.");
  
                  }
  
  
  
                  // estimate frame time and sleep.
  
                  //clock_t tend = clock();
  
                  int64_t tend = av_gettime_relative();
  
                  frameDuration = tend-tstart;//(long)(1000 * (tend - tstart) / CLOCKS_PER_SEC);
  
                  if (1000*frameTime - frameDuration > 0)
  
                      av_usleep(1000*frameTime - frameDuration);
  
                      //QThread::msleep(frameTime - frameDuration);
  
                  tstart = tend;
  
              }
  
  
  
              // if there is another frame in the packet, then loop.
  
              inPacket.size -= decodedLen;
  
              inPacket.data += decodedLen;
  
          }while(inPacket.size > 0);
  
      }
  
  
  
      else if (m_pOutContext)
  
      {
  
  
  
      }
  
  
  
      av_packet_unref(&inPacket);
  
  }

• Detect rotation angle and rotate final video using ffmpeg version 2.8

  3 février 2016, par Hemant Kumar

  I used to work on ffmpeg 2.2 until now and was detecting rotation angle of video uploaded from android / iPhone mobiles and rotate the resulting video so that it run perfectly on a correct angle.

  But since I have updated the ffmpeg to version 2.8 I am getting this rotation problem. My queries are not rotating the videos as they were earlier.

  Here’r the commands I was using :

  To check rotation angle :

  ffprobe -of json -show_streams {$input} | grep rotate

  below is my final command to convert a video to mp4

  "ffmpeg -i {$input} -strict -2 -vcodec libx264 -preset slow -vb 500k -maxrate 500k -bufsize 1000k -vf 'scale=-1:480 ".fix_video_orientation($input)."' -threads 0 -ab 64k -s {$resolution}  -movflags faststart -metadata:s:v:0 rotate=0 {$output}";

  "fix_video_orientation" function is given below. It detect the angle of rotation of the initial video and output optimal option for rotating the final video.

  function fix_video_orientation($input){
  
  
  
  $return= ", transpose=1 ";
  
  
  
  $dd= exec("ffprobe -of json -show_streams  {$input}   | grep rotate");
  
  
  
  if(!empty($dd)){
  
  
  
  $dd=explode(":",$dd);
  
  $rotate=str_replace(",","",str_replace('"',"",$dd[1]));
  
  
  
  if($rotate=="90")return $return;
  
  
  
  else if ($rotate=="180") return ", transpose=2,transpose=2 ";
  
  
  
  else if($rotate == "270") return ", transpose=2 ";
  
  }

  Currently above script is supporting "flv","avi","mp4","mkv","mpg","wmv","asf","webm","mov","3gp","3gpp" extensions, also the script is supporting the resulting .mp4 file to play on all browsers and devices.

  Now the ffprobe command is not returning rotation angle and so a portrait video if uploaded from iphone is showing as landscape on the website.

  Output console of ffprobe command :

  ffprobe version N-77455-g4707497 Copyright (c) 2007-2015 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libdcadec --enable-libfreetype --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  
  libavutil 55. 11.100 / 55. 11.100
  
  libavcodec 57. 20.100 / 57. 20.100
  
  libavformat 57. 20.100 / 57. 20.100
  
  libavdevice 57. 0.100 / 57. 0.100
  
  libavfilter 6. 21.101 / 6. 21.101
  
  libavresample 3. 0. 0 / 3. 0. 0
  
  libswscale 4. 0.100 / 4. 0.100
  
  libswresample 2. 0.101 / 2. 0.101
  
  libpostproc 54. 0.100 / 54. 0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/standard/PORTRAIT.m4v':
  
  Metadata:
  
  major_brand : qt
  
  
  
  minor_version : 0
  
  compatible_brands: qt
  
  
  
  creation_time : 2016-02-03 05:25:18
  
  com.apple.quicktime.make: Apple
  
  com.apple.quicktime.model: iPhone 4S
  
  com.apple.quicktime.software: 9.2.1
  
  com.apple.quicktime.creationdate: 2016-02-03T10:52:11+0530
  
  Duration: 00:00:03.34, start: 0.000000, bitrate: 7910 kb/s
  
  Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
  
  Metadata:
  
  creation_time : 2016-02-03 05:25:18
  
  handler_name : Core Media Data Handler
  
  Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 720x1280 [SAR 1:1 DAR 9:16], 7832 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 50 tbc (default)
  
  Metadata:
  
  creation_time : 2016-02-03 05:25:18
  
  handler_name : Core Media Data Handler
  
  encoder : H.264
  
  Stream #0:2(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
  
  Metadata:
  
  creation_time : 2016-02-03 05:25:18
  
  handler_name : Core Media Data Handler
  
  Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
  
  Metadata:
  
  creation_time : 2016-02-03 05:25:18
  
  handler_name : Core Media Data Handler
  
  Unsupported codec with id 0 for input stream 2
  
  Unsupported codec with id 0 for input stream 3

  If latest version of ffmpeg (2.8) is used to auto rotate the video, can you please suggest me what option I need to add or remove from my final command.

• microbench : Add fallback to gettimeofday()

  3 février 2016, par Dave Yeo

  microbench : Add fallback to gettimeofday()
  Some operating systems such as OS/2 don’t have any of the CLOCK* API
  
  functions so add gettimeofday() as a fallback.
  Signed-off-by : Dave Yeo <dave.r.yeo@gmail.com>
  
  Signed-off-by : Erik de Castro Lopo <erikd@mega-nerd.com>
  

  • [DH] configure.ac
  • [DH] microbench/util.c