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• Get duration through FFMPEG 2014 gcc 4.86

  19 février 2014, par M.Yazdian

  I like to use ffmpeg in my web project to convert video files and get some information of metadata's.

  So I download FFMPEG and use this codes in asp.net:

  For view my code please follow this link http://forums.asp.net/t/1969247.aspx?Problem+width+FFMPEG+2014+gcc+4+86

  This Codes worked currently when I use FFMPEG 2013 gcc 4.2 But when I use FFMPEG 2014 gcc 4.8.2 it's not working...!!!

  In FFMPEG 2014 , I can Convert video formats but I cann't get duration and In FFMPEG 2013 gcc 4.2 I can get duration but I cann't convert video formats (I mean specialy MKV).

  In the FFMPEG 2014 Standard Error I cann't find Duration to parse(HOUR , MINUTE , SECOND).

  In the FFMPEG 2013 Standard Error I can find Duration to parse(HOUR , MINUTE , SECOND) but I cann't connvert video formats.

  Thanks in advance

• Error when use command of ffmpeg on android

  19 février 2014, par user2830969

  I get source code from https://github.com/JayH5/android-ffmpeg-cmdline and then I edit code to be simple than.

  public ProcessRunnable create() {
          if (inputPath == null || outputPath == null) {
              throw new IllegalStateException("Need an input and output filepath!");
          }   
  
          final List cmd = new LinkedList();
  
          cmd.add(mFfmpegPath);
          cmd.add("-i");
          cmd.add(inputPath);
          cmd.add("-s 240x160");
  
          cmd.add(outputPath);
          Log.w("Command", cmd.toString());
          final ProcessBuilder pb = new ProcessBuilder(cmd);
          return new ProcessRunnable(pb);
      }
  

  When I run code, the result is *.mp file 0.00 kb. Please help me fix about this. thank so much

• Reduce Bandwidth requirement for Video Streaming

  19 février 2014, par user3239282

  Please suggest some points on, how to reduce the bandwidth requirement for a video stream.

  We are actually streaming the desktop across internet, Remote Access Application.

  Encoder : libx264.lib

  Decoder : Ffmpeg

  Codec : H264

  Following is how am configuring h264 for encoding:

      x264_param_default_preset(&this->m_x264Settings, "veryfast", "zerolatency");
      this->m_x264Settings.i_threads = 1;
      this->m_x264Settings.i_width = width / 2;
      this->m_x264Settings.i_height = height / 2;
      this->m_x264Settings.i_keyint_max = 10;//fps;
      this->m_x264Settings.b_intra_refresh = 1;
      this->m_x264Settings.i_fps_num = 10;
      this->m_x264Settings.i_fps_den = 1;
      // Intra refres:
      this->m_x264Settings.i_keyint_max = 25;
      this->m_x264Settings.b_intra_refresh = 1;
      //Rate control:
      this->m_x264Settings.rc.i_rc_method = X264_RC_CRF;
      this->m_x264Settings.rc.f_rf_constant = 25;
      this->m_x264Settings.rc.f_rf_constant_max = 35;
  
      //For streaming:
      this->m_x264Settings.b_repeat_headers = 1;
      this->m_x264Settings.b_annexb = 1;
      x264_param_apply_profile(&this->m_x264Settings, "baseline");
  
      this->m_width = width;
      this->m_height = height;
      this->m_encoder = x264_encoder_open(&this->m_x264Settings);
      x264_picture_alloc(&this->m_picIn,X264_CSP_I420,(width / 2),(height / 2));
      int sws_flags = SWS_BICUBIC;
      m_imgConverCtx = sws_getContext(width, height, PIX_FMT_RGB32, (width/2), (height/2), PIX_FMT_YUV420P,sws_flags, NULL, NULL, NULL);
  

  Thanks in advance, Paul.

• ffmpeg cannot open a simple microsoft wav file exported with Audacity

  18 février 2014, par sebpiq

  I have exported a sound file to microsoft wav using Audacity. I am trying to open this file with ffmpeg :

  ffmpeg -i steps-stereo-16b-44khz.wav /tmp/test.ogg
  

  and here's the ouput I get :

  fmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
    built on Jun 12 2013 13:46:11 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-gnutls --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
    libavutil      52. 18.100 / 52. 18.100
    libavcodec     54. 92.100 / 54. 92.100
    libavformat    54. 63.104 / 54. 63.104
    libavdevice    54.  3.103 / 54.  3.103
    libavfilter     3. 42.103 /  3. 42.103
    libswscale      2.  2.100 /  2.  2.100
    libswresample   0. 17.102 /  0. 17.102
    libpostproc    52.  2.100 / 52.  2.100
  [dca @ 0x7fd30c013600] Not a valid DCA frame
  
  ... SNIP ...
  
  [dca @ 0x7fd5bc013600] Invalid bit allocation index
  [dca @ 0x7fd5bc013600] error decoding block
      Last message repeated 3 times
  [dca @ 0x7fd5bc013600] Didn't get subframe DSYNC
  [dca @ 0x7fd5bc013600] error decoding block
  [wav @ 0x7fd5bc013000] max_analyze_duration 5000000 reached at 5009070 microseconds
  [wav @ 0x7fd5bc013000] decoding for stream 0 failed
  [wav @ 0x7fd5bc013000] Could not find codec parameters for stream 0 (Audio: dts ([1][0][0][0] / 0x0001), 192000 Hz, 2 channels, fltp, 0 kb/s): no decodable DTS frames
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  steps-stereo-16b-44khz.wav: could not find codec parameters
  

  If I export the same file to .ogg or .aiff, no problem, the following works fine :

  ffmpeg -i steps-stereo-16b-44khz.aiff /tmp/test.ogg
  

  Any idea what could be wrong?

  A link to my wav file so you can try to reproduce.

  NB my final goal is to slice the audio file. I know I can export file directly to .ogg with audacity. This is just a test case.

  EDIT

  Getting file info with another program like sox, works well :

  sox --info steps-stereo-16b-44khz.wav
  
  Input File     : 'steps-stereo-16b-44khz.wav'
  Channels       : 2
  Sample Rate    : 44100
  Precision      : 16-bit
  Duration       : 00:00:02.10 = 92608 samples = 157.497 CDDA sectors
  File Size      : 370k
  Bit Rate       : 1.41M
  Sample Encoding: 16-bit Signed Integer PCM
  

• command line closes too fast inside python using ffmpeg

  18 février 2014, par user3012914

  I am using python to create a Macro Module inside MevisLab environment. I wanted to use ffmpeg in command prompt inside Python. The Problem is the command prompt closes too fast that i couldnt read while executing ffmpeg.

  My code

    t = 'ffmpeg -r'+str(ctx.field("FrameRate").value)+'-f image2 -pix_fmt yuv44p -s 1920x1080 -i'+path+'%0d.png -vodec libx264 -crf 15'+path+'.mp4'
  
  os.system(t)