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• ffmpeg works manually but not with cron ?

  2 mai 2017, par mdnba50

  I can successfully convert mp3 + audio to mp4 when i run the script manually.

  exec("/usr/bin/ffmpeg -loop 1 -i $destination_thumbnail -i $input_file -c:a copy -c:v libx264 -shortest $videoPath 2>&1",$output);

  When i have the above code in a script executed via cron it doesn’t convert. I get this error.

  Array
  
  (
  
      [0] => ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
  
      [1] =>   built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  
      [2] =>   configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --enable-libfaac --enable-nonfree --enable-libfdk-aac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
      [3] =>   libavutil      54. 20.100 / 54. 20.100
  
      [4] =>   libavcodec     56. 26.100 / 56. 26.100
  
      [5] =>   libavformat    56. 25.101 / 56. 25.101
  
      [6] =>   libavdevice    56.  4.100 / 56.  4.100
  
      [7] =>   libavfilter     5. 11.102 /  5. 11.102
  
      [8] =>   libavresample   2.  1.  0 /  2.  1.  0
  
      [9] =>   libswscale      3.  1.101 /  3.  1.101
  
      [10] =>   libswresample   1.  1.100 /  1.  1.100
  
      [11] =>   libpostproc    53.  3.100 / 53.  3.100
  
      [12] => [mp3 @ 0x1d62bc0] Estimating duration from bitrate, this may be inaccurate
  
      [13] => Input #0, mp3, from '/home/example/public_html/wp-content/channels/videos/temp_1473937603.mp3':
  
      [14] =>   Duration: 00:06:51.05, start: 0.000000, bitrate: 64 kb/s
  
      [15] =>     Stream #0:0: Audio: mp3, 16000 Hz, stereo, s16p, 64 kb/s
  
      [16] => [mjpeg @ 0x1d73de0] Changeing bps to 8
  
      [17] => Input #1, image2, from '/home/examples/public_html/wp-content/channels/thumbnails/thumbnail_516919517.jpg':
  
      [18] =>   Duration: 00:00:00.50, start: 0.000000, bitrate: N/A
  
      [19] =>     Stream #1:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 250x135 [SAR 1:1 DAR 50:27], 2 fps, 2 tbr, 2 tbn, 2 tbc
  
      [20] => No pixel format specified, yuvj420p for H.264 encoding chosen.
  
      [21] => Use -pix_fmt yuv420p for compatibility with outdated media players.
  
      [22] => [libx264 @ 0x1d75240] height not divisible by 2 (250x135)
  
      [23] => Output #0, mp4, to '/home/example/public_html/wp-content/channels/videos/temp_1473937603.mp4':
  
      [24] =>     Stream #0:0: Video: h264, none, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 2 fps
  
      [25] =>     Metadata:
  
      [26] =>       encoder         : Lavc56.26.100 libx264
  
      [27] =>     Stream #0:1: Audio: none, 0 channels, 128 kb/s
  
      [28] => Stream mapping:
  
      [29] =>   Stream #1:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  
      [30] =>   Stream #0:0 -> #0:1 (copy)
  
      [31] => Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  )

  Why does this work when i manually execute the script in conversion.php but when i run conversion.php via cron i get the above error ?

• Failed to capture a avi file using opencv

  30 avril 2017, par Wei

  I am quite new to c++ compilation. I am trying to work on a simple problem using opencv where I read a video file and display it.

  My code looks like :

  #include <opencv></opencv>cv.h>
  
  #include <opencv></opencv>highgui.h>
  
  #include "opencv2/opencv.hpp"
  
  #include <opencv2></opencv2>core/core.hpp>
  
  #include <opencv2></opencv2>highgui/highgui.hpp>
  
  
  
  
  
  #include 
  
  #include 
  
  
  
  #include <algorithm>
  
  #include 
  
  #include 
  
  #include 
  
  #include <fstream>
  
  #include <iostream>
  
  #include <vector>
  
  #include <list>
  
  #include <string>
  
  
  
  
  
  using namespace cv;
  
  
  
  IplImage* image = 0; 
  
  IplImage* prev_image = 0;
  
  
  
  int show = 1; 
  
  
  
  int main( int argc, char** argv )
  
  {
  
      int frameNum = 0;
  
  
  
      char* video = argv[1];
  
      VideoCapture capture(video);
  
  
  
      if( !capture.isOpened() ) { 
  
          printf( "Could not initialize capturing..\n" );
  
          return -1;
  
      }
  
  
  
      if( show == 1 )
  
          cvNamedWindow( "Video", 0 );
  
  
  
      while( true ) {
  
          IplImage* frame = 0;
  
          int i, j, c;
  
  
  
          // get a new frame
  
          //frame = cvQueryFrame( capture );
  
          Mat mat_img;
  
          capture >> mat_img;
  
          IplImage frame1 = mat_img.operator IplImage();
  
          frame = &amp;frame1;
  
          if( !frame )
  
              break;
  
  
  
          if( !image ) {
  
              image =  cvCreateImage( cvSize(frame->width,frame->height), 8, 3 );
  
              image->origin = frame->origin;
  
          }
  
  
  
          cvCopy( frame, image, 0 );
  
  
  
          if( show == 1 ) {
  
              cvShowImage( "Video", image);
  
              c = cvWaitKey(3);
  
              if((char)c == 27) break;
  
          }
  
  
  
          std::cerr &lt;&lt; "The " &lt;&lt; frameNum &lt;&lt; "-th frame" &lt;&lt; std::endl;
  
          frameNum++;
  
      }
  
  
  
      if( show == 1 )
  
          cvDestroyWindow("Video");
  
  
  
      return 0;
  
  }
  
  </string></list></vector></iostream></fstream></algorithm>

  Then I compile it like :

  g++ test.cpp -o Video -pipe -D __STDC_CONSTANT_MACROS -D STD=std -Wall -I. -I/usr/local/ -O3 -DNDEBUG -ggdb -L/usr/local/ -lopencv_core -lopencv_highgui -lopencv_video -lopencv_imgproc -lavformat -lavdevice -lavutil -lavcodec -lswscale

  Compilation works fine and no errors returned.

  However, when I was running it, I got :

  (Video:5651): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed
  
  Could not initialize capturing..

  Some other information :
  1. I test my opencv and ffmpeg by running simple examples, which work well.
  2. I can stream frames from my camera and display it using opencv.

  Anyone has idea of what causes this ?

  Any idea is appreciated.

• IE9+ not playing portrait video in HTML5 video tag

  12 avril 2017, par ptrn

  For some reason I can’t get IE9/10 to play video that is taller than wide, when using HTML5 video tags.

  Demo :
  http://s.l6.no/demo/video+html5/

  The demo shows one video scaled down from 1280x720, which plays perfectly fine in all tested browsers, and one video scaled down from 720x1280 which plays for all browsers but IE9/10.

  Tested and works for :

  • Chrome 26, Windows 7 64-bit
  • Chromium 24, Ubuntu 64-bit
  • Firefox 14, Windows 7 64-bit

  Tested and does not work for :

  • Internet Explorer 9, Windows 7 64-bit
  • Internet Explorer 10, Windows 7 64-bit

  I’m using FFmpeg to code the videos to MP4(x264) and WebM(VP8), with the current command dummed down to this :

  ffmpeg -i in.mp4 -vcodec libx264 -pix_fmt yuv420p -y -b:v 4000k out.mp4

  The lack of profile settings would be my first point, but since the other video is playing just fine, I can’t see why it should matter.

  Any ideas ?

  Edit : soft rotating the video isn’t really an option, as the user is to be able to download the video to play offline. I could transcode an extra version just for IE, but come on, there’s gotta be another way, no ?