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• ffmpeg adding 6 secs of black frames in the beginning of a file

  7 août 2014, par user3842039

  Trying to convert a .mov file (h264 and pcm) generated in Mpegstreamclip (MacOS) and the result is strangely out of sync with around 6 seconds of black frames at the beginning. I have tried many differente audio and video codec and the result is the same even with a -vcodec copy and -acodec copy. Below the return of ffmpeg (git version compiled today - 06/08/2014) :

          ffmpeg -i /media/dados/x/PGM-970.mov -vcodec copy -acodec copy  /media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov 
  
      ffmpeg version 2.3.git-1ace957 Copyright (c) 2000-2014 the FFmpeg developers
  
        built on Jul 26 2014 20:25:06 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
        configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-x11grab --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr
  
        libavutil      52. 92.101 / 52. 92.101
  
        libavcodec     55. 69.100 / 55. 69.100
  
        libavformat    55. 49.100 / 55. 49.100
  
        libavdevice    55. 13.102 / 55. 13.102
  
        libavfilter     4. 11.102 /  4. 11.102
  
        libavresample   1.  3.  0 /  1.  3.  0
  
        libswscale      2.  6.100 /  2.  6.100
  
        libswresample   0. 19.100 /  0. 19.100
  
        libpostproc    52.  3.100 / 52.  3.100
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ddac20] multiple edit list entries, a/v desync might occur, patch welcome
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2ddac20] Concatenated H.264 or H.265 might not play correctly.
  
      Guessed Channel Layout for  Input Stream #0.1 : mono
  
      Guessed Channel Layout for  Input Stream #0.2 : mono
  
      Guessed Channel Layout for  Input Stream #0.3 : mono
  
      Guessed Channel Layout for  Input Stream #0.4 : mono
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/media/dados/x/PGM-970.mov':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 537199360
  
          compatible_brands: qt  
  
          creation_time   : 2014-08-01 16:50:24
  
        Duration: 00:24:56.30, start: 0.000000, bitrate: 8350 kb/s
  
          Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, smpte1File '/media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov' already exists. Overwrite ? [y/N] y
  
  
  
  70m), 720x480, 5258 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 5994 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : H.264
  
        timecode        : 01:00:00;00
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        File '/media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov' already exists. Overwrite ? [y/N] yhandler_name    : Apple Alias Data Handler
  
      Stream #0:2(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:3(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:4(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 1 channels, s16, 768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:5(eng): Data: none (tmcd / 0x64636D74) (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:51:16
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 01:00:00;00
  
  
  
  Output #0, mov, to '/media/dados/convertidos/PGM-970-converted-ffmpeg-compilado.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      encoder         : Lavf55.49.100
  
      Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 720x480, q=2-31, 5258 kb/s, 29.97 fps, 11988 tbn, 2997 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : H.264
  
        timecode        : 01:00:00;00
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, 768 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-08-01 16:50:24
  
        handler_name    : Apple Alias Data Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help

  Even ignoring the audio stream with "-an" ffmpeg persists to add the frames and alter the output duration.

  Any help is very much appreciated ! thanks in advance

• avutil/lzo : Fix integer overflow

  20 juin 2014, par Michael Niedermayer

  avutil/lzo : Fix integer overflow
  Embargoed-till : 2014-06-27 requested by researcher, but embargo broken by libav today (git and mailing list)
  Fixes : LMS-2014-06-16-4
  
  Found-by : "Don A. Bailey" <donb@securitymouse.com>
  
  See : ccda51b14c0fcae2fad73a24872dce75a7964996
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavutil/lzo.c

• Combining JavaCV and openCV

  13 juin 2014, par mister-viper

  I have the following problem :
  I have an Android application which uses native OpenCV code. In a first step, the frames which were edited by OpenCV came from the camera. Then they were processed and drawn on the display.

  However, my requirements now have changed. The frames which have to be edited come from a video file stored on the SD card. They must be processed by the openCV code and then stored in a new video file.

  After reading some a lot of stuff, I recognized that Android has no built-in stuff for correctly reading a video file frame by frame and allowing to process the frames while doing so. On a computer OpenCV has the VideoCapture function. But this does not work on Android as openCV has no ffmpeg that comes with it.

  After reading more stuff, I found that JavaCV comes with an FFMPEGFrameGrabber and also an FFMPEGFrameRecorder. So, I implemented everything which now allows me to grab single frames from a video, obtain an IplImage frame and store this frame in a new video.

  Now the problem :
  During obtaining and storing the IplImage frame must be processed using the original OpenCV code as it is not feasible to port the complete code to JavaCV.

  So in a first place I wrote a small test JNI function which gets the address of a MAT object and draws a small circle on it.

  extern "C" {
  
  JNIEXPORT void JNICALL Java_de_vion_postprocessing_step2_EyeTracking_editFrame(
  
      JNIEnv*, jobject, jlong thiz, jlong addrRgba) {
  
  //Convert the mat addresses into the objects
  
  Mat& rgbFrame = *(Mat*) addrRgba;
  
  
  
  Point2i scaledSmoothPoint(100,100);
  
  circle(rgbFrame, scaledSmoothPoint, 20, YELLOW, -1);
  
  }

  As I read that IplImage extends CvArr I just call the function within in my code as follows :

  captured_frame = grabber.grab();
  
  if (captured_frame == null) {
  
      // no new frames
  
      break;
  
  }
  
  editFrame(captured_frame .address());

  However, I now get the following error :

  06-12 18:58:23.135: E/cv::error()(6498): OpenCV Error: Assertion failed (cn <= 4) in
  
                      void cv::scalarToRawData(const Scalar&, void*, int, int), file 
  
                      /home/reports/ci/slave_desktop/50-SDK/opencv/modules/core/src/matrix.cpp, line 845
  
  06-12 18:58:23.135: A/libc(6498): Fatal signal 6 (SIGABRT) at 0x00001962 (code=-6),
  
                      thread 6526 (AsyncTask #1)

  Finally, me question :
  How can I process the IplImage frame using nativeOpenCV and finally store this IplImage frame then in the video recorder.

  I am also open to new Ideas which do not necessarily require JavaCV as long as I do not have to write the FrameGrabber and FrameRecorder my self.

  Best regards,
  André