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• ffmpeg : using the returned data in php

  4 décembre 2013, par user1503606

  I have started using ffmpeg and I am very new to it, so please bear with me.

  I have installed ffmpeg on my server and it works great ; I can run certain commands and get output data when logged in via ssh

  For example I can run

  ffmpeg -i Sleep\ Away.mp3 

  Which returns the following :

  ffmpeg version 0.8.5, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 20 2012 09:28:43 with clang 3.1 (tags/Apple/clang-318.0.61)
  
    configuration: --enable-nonfree --enable-gpl --enable-version3 --enable-postproc --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libfaac --enable-libxvid --enable-libx264 --enable-libvpx --enable-hardcoded-tables --enable-shared --enable-pthreads --disable-indevs --cc=clang
  
    libavutil    51.  9. 1 / 51.  9. 1
  
    libavcodec   53.  7. 0 / 53.  7. 0
  
    libavformat  53.  4. 0 / 53.  4. 0
  
    libavdevice  53.  1. 1 / 53.  1. 1
  
    libavfilter   2. 23. 0 /  2. 23. 0
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [mp3 @ 0x7f9694011a00] Header missing
  
      Last message repeated 13 times
  
  [mp3 @ 0x7f9694007c00] max_analyze_duration 5000000 reached at 5007020
  
  [mp3 @ 0x7f9694007c00] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, mp3, from 'Sleep Away.mp3':
  
    Metadata:
  
      track           : 3
  
      album           : Bob Acri
  
      artist          : Bob Acri
  
      title           : Sleep Away
  
      genre           : Jazz
  
      album_artist    : Bob Acri
  
      composer        : Robert R. Acri
  
      date            : 2004
  
    Duration: 00:03:21.77, start: 0.000000, bitrate: 192 kb/s
  
      Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 192 kb/s
  
  At least one output file must be specified

  The question I am asking is, how can I use the output data above ? I am developiong a music website ; say I want to loop through all the MP3 files and save the info about them into a database, so that the above would result in :

  Sleep Away.mp3    mp3    3:21    Jazz    2004     Bob Acri ...

  obviously in a table

  I have tried to use the php backtick operator with no success so far. I just thought I would put a question up here to get some advice from people that have done something similar.

  Thanks

  Update : I have tried the following

  &lt;?php $output = `ffmpeg -i Sleep\ Away.mp3`; echo "<pre>$output</pre>"; ?>
  
  &lt;?php $output = shell_exec(&#39;ffmpeg -i Sleep\ Away.mp3&#39;); echo "<pre>$output</pre>"; ?>

  both don't appear to return anything.

• avcodec/mips : loongson optimize h264pred with mmi v3

  17 mai 2016, par Zhou Xiaoyong

  avcodec/mips : loongson optimize h264pred with mmi v3
  1. no longer use the register names directly and optimized code format
  
  2. to be compatible with O32, specify type of address variable with mips_reg and handle the address variable with PTR_ operator
  
  3. ff_pred16x16_plane_ functions only support N64 ABI now
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mips/constants.c
  • [DH] libavcodec/mips/constants.h
  • [DH] libavcodec/mips/h264pred_init_mips.c
  • [DH] libavcodec/mips/h264pred_mmi.c

• How to open webcam in opencv2.4.6.1 on ubuntu12.04 ?

  20 septembre 2013, par user2079542

  I am using opencv2.4.6.1 on Ubuntu 12.04 LTS. I am new to opencv and have been trying to understand the sample programs in the opencv docs. I am trying to work on a project which takes a picture from a USB webcam (Kinamax Night Vision Camera) and do some image processing on it. I came across a sample code that is shown below :

  #include "cv.h" 
  
  #include "highgui.h" 
  
  #include   
  
  // A Simple Camera Capture Framework 
  
  int main() 
  
  {
  
  CvCapture* capture = cvCaptureFromCAM( CV_CAP_ANY );
  
  if ( !capture ) {
  
   fprintf( stderr, "ERROR: capture is NULL \n" );
  
   getchar();
  
   return -1;
  
  }
  
  // Create a window in which the captured images will be presented
  
  cvNamedWindow( "mywindow", CV_WINDOW_AUTOSIZE );
  
  // Show the image captured from the camera in the window and repeat
  
  while ( 1 ) {
  
   // Get one frame
  
   IplImage* frame = cvQueryFrame( capture );
  
   if ( !frame ) {
  
     fprintf( stderr, "ERROR: frame is null...\n" );
  
     getchar();
  
     break;
  
   }
  
   cvShowImage( "mywindow", frame );
  
   // Do not release the frame!
  
   //If ESC key pressed, Key=0x10001B under OpenCV 0.9.7(linux version),
  
   //remove higher bits using AND operator
  
   if ( (cvWaitKey(10) & 255) == 27 ) break;
  
  }
  
  // Release the capture device housekeeping
  
  cvReleaseCapture( &capture );
  
  cvDestroyWindow( "mywindow" );
  
  return 0;
  
  }

  On compiling using :

  g++ trycam.c -o trycam `--cflags --libs opencv`

  It gives no errors.
  When I try to run it using : ./trycam Nothing shows up ! Literally Nothing.

  On searching google and some other posts in the stackoverflow community, I tried updating the libraries and install other dependencies like ffmpeg,GTK, Gstreamer,etc. I understand that the webcam I have connected via USB is not supported as per the list of webcams supported by linux opencv in the link here. Even my default webcam that is in my HP Pavilion dv6000 is not opening.

  Is there a way I could get around this ? Kindly help me out.