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• Transcoding audio using xuggler

  23 juin 2014, par amd

  I am trying to convert an audio file with the header

  Opening audio decoder: [pcm] Uncompressed PCM audio decoder
  
  AUDIO: 44100 Hz, 2 ch, s16le, 1411.2 kbit/100.00% (ratio: 176400->176400)
  
  Selected audio codec: [pcm] afm: pcm (Uncompressed PCM)

  I want to transcode this file to mp3 format. I have following code snippet but its not working well. I have written it using XUGGLER code snippet for transcoding audio and video.

  Audio decoder is

      audioDecoder = IStreamCoder.make(IStreamCoder.Direction.DECODING, ICodec.findDecodingCodec(ICodec.ID.CODEC_ID_PCM_S16LE));
  
      audioDecoder.setSampleRate(44100);
  
      audioDecoder.setBitRate(176400);
  
      audioDecoder.setChannels(2);
  
      audioDecoder.setTimeBase(IRational.make(1,1000));
  
      if (audioDecoder.open(IMetaData.make(), IMetaData.make()) < 0)
  
          return false;
  
      return true; 

  Audio encoder is

      outContainer = IContainer.make();
  
      outContainerFormat = IContainerFormat.make();
  
      outContainerFormat.setOutputFormat("mp3", urlOut, null);
  
      int retVal = outContainer.open(urlOut, IContainer.Type.WRITE, outContainerFormat);
  
      if (retVal < 0) {
  
          System.out.println("Could not open output container");
  
          return false;
  
      }
  
      outAudioCoder = IStreamCoder.make(IStreamCoder.Direction.ENCODING, ICodec.findEncodingCodec(ICodec.ID.CODEC_ID_MP3));
  
      outAudioStream = outContainer.addNewStream(outAudioCoder);
  
      outAudioCoder.setSampleRate(new Integer(44100));
  
      outAudioCoder.setChannels(2);
  
      retVal = outAudioCoder.open(IMetaData.make(), IMetaData.make());
  
      if (retVal < 0) {
  
          System.out.println("Could not open audio coder");
  
          return false;
  
      }
  
      retVal = outContainer.writeHeader();
  
      if (retVal < 0) {
  
          System.out.println("Could not write output FLV header: ");
  
          return false;
  
      }
  
      return true;

  And here is encode method where i send packets of 32 byte to transcode

  public void encode(byte[] audioFrame){
  
      //duration of 1 video frame
  
      long lastVideoPts = 0;
  
  
  
      IPacket packet_out = IPacket.make();
  
      int lastPos = 0;
  
      int lastPos_out = 0;
  
  
  
      IAudioSamples audioSamples = IAudioSamples.make(48000, audioDecoder.getChannels());
  
      IAudioSamples audioSamples_resampled = IAudioSamples.make(48000, audioDecoder.getChannels());
  
  
  
      //we always have 32 bytes/sample
  
      int pos = 0;
  
      int audioFrameLength = audioFrame.length;
  
      int audioFrameCnt = 1;
  
      iBuffer = IBuffer.make(null, audioFrame, 0, audioFrameLength);
  
      IPacket packet = IPacket.make(iBuffer);
  
      //packet.setKeyPacket(true);
  
      packet.setTimeBase(IRational.make(1,1000));
  
      packet.setDuration(20);
  
      packet.setDts(audioFrameCnt*20);
  
      packet.setPts(audioFrameCnt*20);
  
      packet.setStreamIndex(1);
  
      packet.setPosition(lastPos);
  
      lastPos+=audioFrameLength;
  
      int pksz = packet.getSize();
  
      packet.setComplete(true, pksz);
  
      /*
  
      * A packet can actually contain multiple samples
  
      */
  
      int offset = 0;
  
      int retVal;
  
      while(offset < packet.getSize())
  
      {
  
          int bytesDecoded = audioDecoder.decodeAudio(audioSamples, packet, offset);
  
          if (bytesDecoded < 0)
  
              throw new RuntimeException("got error decoding audio ");
  
          offset += bytesDecoded;
  
          if (audioSamples.isComplete())
  
          {
  
              int samplesConsumed = 0;
  
              while (samplesConsumed < audioSamples.getNumSamples()) {
  
                  retVal = outAudioCoder.encodeAudio(packet_out, audioSamples, samplesConsumed);
  
                  if (retVal <= 0)
  
                      throw new RuntimeException("Could not encode audio");
  
                  samplesConsumed += retVal;
  
                  if (packet_out.isComplete()) {
  
                      packet_out.setPosition(lastPos_out);
  
                      packet_out.setStreamIndex(1);
  
                      lastPos_out+=packet_out.getSize();
  
                      retVal = outContainer.writePacket(packet_out);
  
                      if(retVal < 0){
  
                          throw new RuntimeException("Could not write data packet");
  
                      }
  
                  }
  
              }
  
          }
  
  
  
      }
  
  
  
  }

  I get an output file but it doesnt get played. I have very little experience of audio encoding and sampling. Thanks in advance.

• libavcodec get video duration and framerate

  17 septembre 2013, par Tishu

  I have a video encoded in .3gp h.264 and I am looking to get its framerate and duration in C. Here is the code I use after opening the file and finding the appropriate codecs :

  AVRational rational = gVideoCodecCtx->time_base;
  
  
  
  LOGI(10, "numerator is %i", rational.num);
  
  LOGI(10, "denominator is %i", rational.den);
  
  LOGI(10, "duration is %d", gFormatCtx->duration);
  
  LOGI(10, "fps is %d", (double)av_q2d(rational));

  And here is the output :

  12-02 12:30:19.819: I/FFmpegTest(23903): numerator is 1
  
  12-02 12:30:19.819: I/FFmpegTest(23903): denominator is 180000
  
  12-02 12:30:19.819: I/FFmpegTest(23903): duration is 6594490
  
  12-02 12:30:19.819: I/FFmpegTest(23903): fps is 1692926992

  From the documentation I understand that the duration is meant to be "duration/time_base" which gives me 6594490 / 180000 = 36.6. The duration of my video file is 6 seconds and I do not know where this factor of 6 would come from.

  Also the framerate seems to be completely off.

  It is currenlty hard to find help as a lot of tutorials use deprecated methods and the documentation does not give examples.

  Any help would be appreciated.

  Thanks

  Edit :
  Thanks to the comment below I managed to print the following

  12-02 18:59:36.279: I/FFmpegTest(435): numerator is 1
  
  12-02 18:59:36.279: I/FFmpegTest(435): denominator is 180000
  
  12-02 18:59:36.279: I/FFmpegTest(435): duration is 6594490
  
  12-02 18:59:36.279: I/FFmpegTest(435): fps is 0.000006

  I also managed to find out a frame's timestamp in msec with this :

  int msec = 1000*(packet.pts * timeBase * gVideoCodecCtx->ticks_per_frame);

  This returns me something that's roughly 33fps (I expect 30). But I can't figure out how to retrieve the duration. The documentation says "duration of the stream, in AV_TIME_BASE fractional seconds" but 6594490 * 0.000006 = 39.5 - the correct duration is 6.3 seconds). Also the exact fps is 30 but nor sure how to get from 0.000006 to 30 with the above figures)

  Thanks

• video after ffmpeg command conversion is not playing on windows

  10 décembre 2015, par Hemant Kumar

  I am stuck at a very weird and complex problem, hoping if anyone know the solution :

  I am converting user uploaded video using ffmpeg command on server and it was working fine as well. Today I found that if a video is recorded by a webcam from windows, is playing well in linux as well as on windows where as if user is creating a video by webcam from linux, is playing only on linux (any browser). On window it’s screen either show loading icon or black screen while audio is working fine.

  I am using following codec :

  ['-strict', '-2', '-preset slow', '-maxrate 500k', '-bufsize 1000k', vfOption, '-threads 0', '-ab 64k', '-movflags faststart','-vf scale=-1:480', '-metadata:s:v:0 rotate=0', '-vcodec libx264']

  I work on linux and using html5 player on my website. I am converting video in mp4 format.

  Input :

  ffmpeg -i /<server path="path">/stream_FE2AF05B-E630-1F7B-390B-37325B31B362.flv -strict -2 -vcodec libx264 -preset slow -vb 500k -maxrate 500k -bufsize 1000k -vf 'scale=-1:480 ' -threads 0 -ab 64k -s 640x480 -movflags faststart -metadata:s:v:0 rotate=0 /<server path="path">/testing.mp4
  
  </server></server>

  Output :

  ffmpeg version 2.2.5 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug  1 2014 09:24:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libtheora --enable-libx264 --enable-libvpx --enable-libmp3lame
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, flv, from '/<server path="path">/stream_FE2AF05B-E630-1F7B-390B-37325B31B362.flv':
  
    Metadata:
  
      canSeekToEnd    : true
  
    Duration: 00:00:04.04, start: 0.000000, bitrate: 636 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 640x480, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: nellymoser, 44100 Hz, mono, flt
  
  [libx264 @ 0x23c5340] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x23c5340] profile High, level 5.2
  
  [libx264 @ 0x23c5340] 264 - core 142 r2453 ea0ca51 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=24 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=cbr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/<server path="path">/testing.mp4':
  
    Metadata:
  
      canSeekToEnd    : true
  
      encoder         : Lavf55.33.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x480, q=-1--1, 500 kb/s, 16k tbn, 1k tbc
  
      Metadata:
  
        rotate          : 0
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 64 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flv -> libx264)
  
    Stream #0:1 -> #0:1 (nellymoser -> aac)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0x23c0200] Starting second pass: moving the moov atom to the beginning of the file2 drop=0    
  
  frame= 4020 fps=706 q=-1.0 Lsize=     355kB time=00:00:04.08 bitrate= 712.0kbits/s dup=3931 drop=0    
  
  video:271kB audio:32kB subtitle:0 data:0 global headers:0kB muxing overhead 16.957901%
  
  [libx264 @ 0x23c5340] frame I:17    Avg QP:27.55  size:  7119
  
  [libx264 @ 0x23c5340] frame P:1013  Avg QP:25.37  size:    88
  
  [libx264 @ 0x23c5340] frame B:2990  Avg QP:27.32  size:    22
  
  [libx264 @ 0x23c5340] consecutive B-frames:  0.8%  0.0%  0.1% 99.1%
  
  [libx264 @ 0x23c5340] mb I  I16..4: 42.0% 55.1%  2.9%
  
  [libx264 @ 0x23c5340] mb P  I16..4:  0.3%  0.4%  0.0%  P16..4:  0.6%  0.1%  0.0%  0.0%  0.0%    skip:98.6%
  
  [libx264 @ 0x23c5340] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.2%  0.0%  0.0%  direct: 0.0%  skip:99.8%  L0:35.7% L1:64.3% BI: 0.0%
  
  [libx264 @ 0x23c5340] 8x8 transform intra:55.0% inter:84.5%
  
  [libx264 @ 0x23c5340] direct mvs  spatial:87.6% temporal:12.4%
  
  [libx264 @ 0x23c5340] coded y,uvDC,uvAC intra: 33.4% 51.9% 0.7% inter: 0.0% 0.1% 0.0%
  
  [libx264 @ 0x23c5340] i16 v,h,dc,p: 26% 54% 15%  5%
  
  [libx264 @ 0x23c5340] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 16% 53%  3%  1%  2%  2%  3%  3%
  
  [libx264 @ 0x23c5340] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 20% 13% 14%  5%  7%  7% 11%  8%
  
  [libx264 @ 0x23c5340] i8c dc,h,v,p: 43% 31% 23%  3%
  
  [libx264 @ 0x23c5340] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x23c5340] ref P L0: 80.9%  9.0%  6.9%  2.6%  0.7%
  
  [libx264 @ 0x23c5340] ref B L0: 89.4%  8.6%  1.8%  0.2%
  
  [libx264 @ 0x23c5340] ref B L1: 91.0%  9.0%
  
  [libx264 @ 0x23c5340] kb/s:551.72
  
  </server></server>

  ---

  Outout from file recorded on window :

  Input :

  ffmpeg -i /<server path="path">/stream_window.flv -strict -2 -vcodec libx264 -preset slow -vb 500k -maxrate 500k -bufsize 1000k -vf 'scale=-1:480 ' -threads 0 -ab 64k -s 640x480 -movflags faststart -metadata:s:v:0 rotate=0 /<server path="path">/testing_1.mp4
  
  </server></server>

  Output :

  ffmpeg version 2.2.5 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug  1 2014 09:24:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libtheora --enable-libx264 --enable-libvpx --enable-libmp3lame
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, flv, from '/<server path="path">/stream_window.flv':
  
    Metadata:
  
      canSeekToEnd    : true
  
    Duration: 00:00:09.22, start: 0.000000, bitrate: 420 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 640x480, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: nellymoser, 44100 Hz, mono, flt
  
  [libx264 @ 0x1e09fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x1e09fc0] profile High, level 5.2
  
  [libx264 @ 0x1e09fc0] 264 - core 142 r2453 ea0ca51 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=24 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=cbr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=500 vbv_bufsize=1000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/<server path="path">/testing_1.mp4':
  
    Metadata:
  
      canSeekToEnd    : true
  
      encoder         : Lavf55.33.100
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x480, q=-1--1, 500 kb/s, 16k tbn, 1k tbc
  
      Metadata:
  
        rotate          : 0
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, fltp, 64 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flv -> libx264)
  
    Stream #0:1 -> #0:1 (nellymoser -> aac)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0x1e06220] Starting second pass: moving the moov atom to the beginning of the file7 drop=0    
  
  frame= 8936 fps=703 q=-1.0 Lsize=     771kB time=00:00:09.26 bitrate= 681.5kbits/s dup=8907 drop=0    
  
  video:585kB audio:73kB subtitle:0 data:0 global headers:0kB muxing overhead 17.106213%
  
  [libx264 @ 0x1e09fc0] frame I:40    Avg QP:29.54  size:  7449
  
  [libx264 @ 0x1e09fc0] frame P:2248  Avg QP:30.88  size:    69
  
  [libx264 @ 0x1e09fc0] frame B:6648  Avg QP:39.17  size:    22
  
  [libx264 @ 0x1e09fc0] consecutive B-frames:  0.8%  0.0%  0.1% 99.1%
  
  [libx264 @ 0x1e09fc0] mb I  I16..4: 36.8% 60.7%  2.5%
  
  [libx264 @ 0x1e09fc0] mb P  I16..4:  0.2%  0.3%  0.0%  P16..4:  0.4%  0.0%  0.0%  0.0%  0.0%    skip:98.9%
  
  [libx264 @ 0x1e09fc0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.2%  0.0%  0.0%  direct: 0.0%  skip:99.8%  L0:34.2% L1:65.8% BI: 0.0%
  
  [libx264 @ 0x1e09fc0] 8x8 transform intra:60.6% inter:87.6%
  
  [libx264 @ 0x1e09fc0] direct mvs  spatial:72.8% temporal:27.2%
  
  [libx264 @ 0x1e09fc0] coded y,uvDC,uvAC intra: 36.3% 62.8% 4.7% inter: 0.0% 0.0% 0.0%
  
  [libx264 @ 0x1e09fc0] i16 v,h,dc,p: 33% 46% 15%  7%
  
  [libx264 @ 0x1e09fc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 19% 46%  3%  1%  1%  1%  2%  4%
  
  [libx264 @ 0x1e09fc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 17% 14%  9%  4%  4%  5%  5%  7%
  
  [libx264 @ 0x1e09fc0] i8c dc,h,v,p: 42% 31% 23%  4%
  
  [libx264 @ 0x1e09fc0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x1e09fc0] ref P L0: 82.6%  9.9%  5.2%  1.7%  0.5%
  
  [libx264 @ 0x1e09fc0] ref B L0: 87.1% 11.0%  1.4%  0.4%
  
  [libx264 @ 0x1e09fc0] ref B L1: 90.3%  9.7%
  
  [libx264 @ 0x1e09fc0] kb/s:536.03
  
  </server></server>

  ---

  Can anyone figure what could be the problem ?

  @LordNeckbeard : Please find the command and its output above. Thanks