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• Android - JavaCV concat videos sound out of sync

  30 mars 2016, par Luis Reja

  Im developing an Android app using Android Studio. The app let you to record 4 videos (steps) from the device camera.

  Once the final step is recorded, the app concat all 4 videos using javacv (with ffmpeg).

  All working fine, I made a procedure to concat the videos, I concat step1 and step 2 to output12, then concat step3 and step4 to output34. Finally I concat output12 and output34. The video looks fine, but the sound is not sync.

  If I reproduce step1,step2,step3,step4,output12 and output34, the sound is sync.

  If I reproduce the final video the sounds is not sync.

  For your information, I reduce the quality video for test purposes.

  Any Clues ? I have been looking for information, but no results.

  This is the procedure to concat videos.

  protected void ConcatTwoVideos(String step1,String step2,String finalvideo){
  
  
  
   FrameGrabber grabber1 = new FFmpegFrameGrabber(Environment.getExternalStorageDirectory() + "/"+step1+".mp4");
  
   try {
  
        grabber1.start();
  
   } catch (FrameGrabber.Exception e) {
  
        e.printStackTrace();
  
   }
  
  
  
   FrameGrabber grabber2 = new FFmpegFrameGrabber(Environment.getExternalStorageDirectory() + "/"+step2+".mp4");
  
   try {
  
        grabber2.start();
  
   } catch (FrameGrabber.Exception e) {
  
        e.printStackTrace();
  
   }
  
  
  
   FrameRecorder recorder2 = new FFmpegFrameRecorder(Environment.getExternalStorageDirectory() + "/"+finalvideo+".mp4", grabber1.getImageWidth(), grabber1.getImageHeight(), grabber1.getAudioChannels());
  
   recorder2.setFrameRate(grabber1.getFrameRate());
  
   recorder2.setSampleFormat(grabber1.getSampleFormat());
  
   recorder2.setSampleRate(grabber1.getSampleRate());
  
   recorder2.setVideoOption("preset", "ultrafast");
  
   recorder2.setVideoCodec(avcodec.AV_CODEC_ID_H264);
  
  
  
  try {
  
      recorder2.start();
  
  } catch (FrameRecorder.Exception e) {
  
      e.printStackTrace();
  
  }
  
  videopaso++;
  
  publishProgress();
  
  Frame frame;
  
  int j = 0;
  
  try {
  
      while ((frame = grabber1.grabFrame()) != null) {
  
          j++;
  
          recorder2.record(frame);
  
  
  
      }
  
  } catch (FrameGrabber.Exception e) {
  
      e.printStackTrace();
  
  } catch (FrameRecorder.Exception e) {
  
      e.printStackTrace();
  
  }
  
  videopaso++;
  
  publishProgress();
  
  try {
  
      while ((frame = grabber2.grabFrame()) != null) {
  
          recorder2.record(frame);
  
  
  
      }
  
  } catch (FrameGrabber.Exception e) {
  
      e.printStackTrace();
  
  } catch (FrameRecorder.Exception e) {
  
      e.printStackTrace();
  
  }
  
  
  
  try {
  
      recorder2.stop();
  
      grabber2.stop();
  
      grabber1.stop();
  
  } catch (FrameRecorder.Exception e) {
  
      e.printStackTrace();
  
  } catch (FrameGrabber.Exception e) {
  
      e.printStackTrace();
  
  }
  
  }

• How to play FFMPEG sound sample with OpenAL ?

  22 mars 2016, par Asim

  I am using FFMPEG to load Audio Video from File. It works with video, but I don’t know how to play audio samples.

  Here is my code to get audio samples :

  m_AdotimeBase = (int64_t(m_Adocdec_ctx->time_base.num) * AV_TIME_BASE) / int64_t(m_Adocdec_ctx->time_base.den);   
  
  if(!m_Adofmt_ctx)
  
  {
  
      //AfxMessageBox(L"m_timeBase");
  
      return FALSE ;
  
  }
  
  int64_t seekAdoTarget = int64_t(m_currFrame) * m_AdotimeBase;   
  
  
  
  
  
  if(av_seek_frame(m_Adofmt_ctx, -1, seekAdoTarget, AVSEEK_FLAG_ANY) < 0)
  
  {
  
      /*CString st;
  
      st.Format(L"%d",m_currFrame);
  
      AfxMessageBox(L"av_seek_frame "+st);*/
  
      m_currFrame = m_totalFrames-1;
  
      return FALSE ;
  
  }
  
  
  
  if ((ret = av_read_frame(m_Adofmt_ctx, &packet)) < 0)
  
          return FALSE;
  
  if (packet.stream_index == 0)       
  
  {
  
      ret = avcodec_decode_audio4(m_Adocdec_ctx, &in_AdeoFrame, &got_frame, &packet);
  
      if (ret < 0) 
  
      {
  
          av_free_packet(&packet);
  
          return FALSE;
  
      }
  
  }

  My problem is I want to listen that sample using OPENAL.

  I would appreciate any tutorials or references on the subject.

• FFMpeg - add sound to video that already contain sound

  24 mars 2016, par jacky brown

  Here is what I have : input1.avi - video that contain sounds. input2.avi - video that doesn’t contain sounds. music.mp3 - audio file.

  I want to add background music(music.mp3 file) to the video.

  C :\input1.avi -i C :\music.mp3 -shortest -c:v copy -c:a copy C :\output1.avi
  then output1.avi is the same as input1 - movie with sounds but without the background music (music.mp3)

  when I try to use the other file (video without sounds) :

  C :\input2.avi -i C :\music.mp3 -shortest -c:v copy -c:a copy C :\output2.avi
  then output2.avi is the same as input2 + it have the background music.

  I tried to execute this too :

  C:\ffmpeg\bin>ffmpeg -i C:\input.avi -i C:\music.mp3 -shortest -c:v copy -filter_ complex "[1]volume=1.5[1a];[0][1a]amerge[a]" -map 0:v -map "[a]" -ac 2 C:\output1.avi

  but got the next error messsage :

  ffmpeg version N-78949-g6f5048f Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
  enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
  ibilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopenc
  
  ore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --ena
  
  ble-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable
  
  -libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --ena
  
  ble-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx
  
  264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable
  
  -lzma --enable-decklink --enable-zlib
  
    libavutil      55. 19.100 / 55. 19.100
  
    libavcodec     57. 27.101 / 57. 27.101
  
    libavformat    57. 28.100 / 57. 28.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 39.100 /  6. 39.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, avi, from 'C:\output1.avi':
  
    Metadata:
  
      encoder         : Lavf57.28.100
  
    Duration: 00:02:05.76, start: 0.000000, bitrate: 450 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 720
  
  x480 [SAR 1:1 DAR 3:2], 440 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 k
  
  b/s
  
  [mp3 @ 00000000005abc20] Skipping 0 bytes of junk at 32370.
  
  Input #1, mp3, from 'C:\music.mp3':
  
    Metadata:
  
      title           : Broadcast News Package - News Intro
  
      artist          : After Effects News Template
  
    Duration: 00:01:57.89, start: 0.025057, bitrate: 194 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
  
      Metadata:
  
        encoder         : Lavc56.26
  
  [Parsed_amerge_1 @ 0000000000610200] No channel layout for input 1
  
  [Parsed_amerge_1 @ 0000000000610200] No channel layout for input 2
  
  [AVFilterGraph @ 00000000005ddfe0] The following filters could not choose their
  
  formats: Parsed_amerge_1
  
  Consider inserting the (a)format filter near their input or output.
  
  Error configuring complex filters.
  
  I/O error

  So why input1 does not contain the background music ? and how can I decrease or increase the volume of music.mp3 file ?