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• ff_put_wav_header : add flag to force WAVEFORMATEX

  30 avril 2014, par Daniel Verkamp

  ff_put_wav_header : add flag to force WAVEFORMATEX
  Partially undoes commit 2c4e08d89327595f7f4be57dda4b3775e1198d5e :
      riff : always generate a proper WAVEFORMATEX structure in
  
      ff_put_wav_header
  A new flag, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX, is added to force the
  
  use of WAVEFORMATEX rather than PCMWAVEFORMAT even for PCM codecs.
  This flag is used in the Matroska muxer (the cause of the original
  
  change) and in the ASF muxer, because the specifications for
  
  these formats indicate explicitly that WAVEFORMATEX should be used.
  Muxers for other formats will return to the original behavior of writing
  
  PCMWAVEFORMAT when writing a header for raw PCM.
  In particular, this causes raw PCM in WAV to generate the canonical
  
  44-byte header expected by some tools.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/asfenc.c
  • [DH] libavformat/avienc.c
  • [DH] libavformat/matroskaenc.c
  • [DH] libavformat/movenc.c
  • [DH] libavformat/riff.h
  • [DH] libavformat/riffenc.c
  • [DH] libavformat/wavenc.c
  • [DH] libavformat/wtvenc.c
  • [DH] tests/fate/filter-audio.mak
  • [DH] tests/ref/acodec/adpcm-adx
  • [DH] tests/ref/acodec/adpcm-ima_qt
  • [DH] tests/ref/acodec/adpcm-ima_wav
  • [DH] tests/ref/acodec/adpcm-ms
  • [DH] tests/ref/acodec/adpcm-swf
  • [DH] tests/ref/acodec/adpcm-yamaha
  • [DH] tests/ref/acodec/alac
  • [DH] tests/ref/acodec/flac
  • [DH] tests/ref/acodec/g723_1
  • [DH] tests/ref/acodec/mp2
  • [DH] tests/ref/acodec/mp2fixed
  • [DH] tests/ref/acodec/pcm-alaw
  • [DH] tests/ref/acodec/pcm-f32be
  • [DH] tests/ref/acodec/pcm-f32le
  • [DH] tests/ref/acodec/pcm-f64be
  • [DH] tests/ref/acodec/pcm-f64le
  • [DH] tests/ref/acodec/pcm-mulaw
  • [DH] tests/ref/acodec/pcm-s16be
  • [DH] tests/ref/acodec/pcm-s16be_planar
  • [DH] tests/ref/acodec/pcm-s16le
  • [DH] tests/ref/acodec/pcm-s16le_planar
  • [DH] tests/ref/acodec/pcm-s24be
  • [DH] tests/ref/acodec/pcm-s24le
  • [DH] tests/ref/acodec/pcm-s24le_planar
  • [DH] tests/ref/acodec/pcm-s32be
  • [DH] tests/ref/acodec/pcm-s32le
  • [DH] tests/ref/acodec/pcm-s32le_planar
  • [DH] tests/ref/acodec/pcm-s8
  • [DH] tests/ref/acodec/pcm-s8_planar
  • [DH] tests/ref/acodec/pcm-u16be
  • [DH] tests/ref/acodec/pcm-u16le
  • [DH] tests/ref/acodec/pcm-u24be
  • [DH] tests/ref/acodec/pcm-u24le
  • [DH] tests/ref/acodec/pcm-u32be
  • [DH] tests/ref/acodec/pcm-u32le
  • [DH] tests/ref/acodec/pcm-u8
  • [DH] tests/ref/acodec/roqaudio
  • [DH] tests/ref/fate/mapchan-6ch-extract-2
  • [DH] tests/ref/fate/mapchan-6ch-extract-2-downmix-mono
  • [DH] tests/ref/fate/mapchan-silent-mono
  • [DH] tests/ref/lavf/w64
  • [DH] tests/ref/lavf/wav
  • [DH] tests/ref/seek/acodec-pcm-s16le
  • [DH] tests/ref/seek/acodec-pcm-u8
  • [DH] tests/ref/seek/lavf-wav

• How to convert video to audio in paperclip [closed]

  7 mai 2014, par jonas_bring

  I upload video files from iOS and need to convert the original file to audio using ffmpeg, but the convert options needed is somewhat over my head. Does anyone know how to do it ?
  Thanks !

  Clarification : How do I write the convert_options for paperclip-ffmpeg to convert a video to audio ?

• OpenCV and Network Cameras

  10 mai 2014, par Alexander

  ---

  So as a bit of context ; this program was built originally to work with USB cameras - but a few things changed. Now I’m trying to convert it to work with networked cameras, but my presence here should make it quite apparent what my level of success has been so far.

  ---

  I’m using :

  • OpenCV v2.4.6.0
  • C++
  • D-Link Cloud Camera 7100 (Installer is DCS-7010L, according to the instructions.)

  ---

  I am trying to access the DLink camera’s video feed through OpenCV.

  I can access the camera through it’s IP address with a browser without any issues. Unfourtunately ; my program is less cooperative. When attempting to access the camera the program gives the OpenCV-generated error :

  warning : Error opening file (../../modules/highgui/src/cap_ffmpeg_impl.hpp:529)

  This error occurs with just about everything I try that doesn’t somehow generate more problems.

  For reference - the code in OpenCV’s cap_ffmpeg_impl.hpp around line 529 is as follows :

  522    bool CvCapture_FFMPEG::open( const char* _filename )
  
  523    {
  
  524        unsigned i;
  
  525        bool valid = false;
  
  526
  
  527        close();
  
  528
  
  529    #if LIBAVFORMAT_BUILD >= CALC_FFMPEG_VERSION(52, 111, 0)
  
  530        int err = avformat_open_input(&ic, _filename, NULL, NULL);
  
  531    #else
  
  532        int err = av_open_input_file(&ic, _filename, NULL, 0, NULL);
  
  533    #endif
  
  ...
  
  616    }

  ...for which I have no idea what I’m looking at. It seems to be looking for the ffmpeg version - but I’ve already installed the latest ffmpeg on that computer, so that shouldn’t be the issue.

  This is the edited down version I tried to use as per Sebastian Schmitz’s recommendation :

   1    #include <fstream>                            // File input/output
  
   2    #include <iostream>                           // cout / cin / etc
  
   3    #include                       // Windows API stuff
  
   4    #include                             // More input/output stuff
  
   5    #include <string>                         // "Strings" of characters strung together to form words and stuff
  
   6    #include <cstring>                            // "Strings" of characters strung together to form words and stuff
  
   7    #include <streambuf>                      // For buffering load files
  
   8    #include <array>                          // Functions for working with arrays
  
   9    #include <opencv2></opencv2>imgproc/imgproc.hpp>        // Image Processor
  
  10    #include <opencv2></opencv2>core/core.hpp>          // Basic OpenCV structures (cv::Mat, Scalar)
  
  11    #include <opencv2></opencv2>highgui/highgui.hpp>        // OpenCV window I/O
  
  12    #include "opencv2/calib3d/calib3d.hpp"
  
  13    #include "opencv2/features2d/features2d.hpp"
  
  14    #include "opencv2/opencv.hpp"
  
  15    #include "resource.h"                     // Included for linking the .rc file
  
  16    #include                             // For sleep()
  
  17    #include <chrono>                         // To get start-time of program.
  
  18    #include <algorithm>                      // For looking at whole sets.
  
  19
  
  20    #ifdef __BORLANDC__
  
  21      #pragma argsused
  
  22    #endif
  
  23
  
  24    using namespace std;                      // Standard operations. Needed for most basic functions.
  
  25    using namespace std::chrono;              // Chrono operations. Needed getting starting time of program.
  
  26    using namespace cv;                           // OpenCV operations. Needed for most OpenCV functions.
  
  27
  
  28    string videoFeedAddress = "";
  
  29    VideoCapture videoFeedIP = NULL;
  
  30    Mat clickPointStorage; //Artifact from original program.
  
  31
  
  32    void displayCameraViewTest()
  
  33    {
  
  34      VideoCapture cv_cap_IP;
  
  35      Mat color_img_IP;
  
  36      int capture;
  
  37      IplImage* color_img;
  
  38      cv_cap_IP.open(videoFeedAddress);
  
  39      Sleep(100);
  
  40      if(!cv_cap_IP.isOpened())
  
  41      {
  
  42          cout &lt;&lt; "Video Error: Video input will not work.\n";
  
  43          cvDestroyWindow("Camera View");
  
  44          return;
  
  45      }
  
  46      clickPointStorage.create(color_img_IP.rows, color_img_IP.cols, CV_8UC3);
  
  47      clickPointStorage.setTo(Scalar(0, 0, 0));
  
  48      cvNamedWindow("Camera View", 0); // create window
  
  49      IplImage* IplClickPointStorage = new IplImage(clickPointStorage);
  
  50      IplImage* Ipl_IP_Img;
  
  51      
  
  52      for(;;)
  
  53      {
  
  54          cv_cap_IP.read(color_img_IP);
  
  55          IplClickPointStorage = new IplImage(clickPointStorage);
  
  56          Ipl_IP_Img = new IplImage(color_img_IP);
  
  57          cvAdd(Ipl_IP_Img, IplClickPointStorage, color_img);
  
  58          cvShowImage("Camera View", color_img); // show frame
  
  59          capture = cvWaitKey(10); // wait 10 ms or for key stroke
  
  60          if(capture == 27 || capture == 13 || capture == 32){break;} // if ESC, Return, or space; close window.
  
  61      }
  
  62      cv_cap_IP.release();
  
  63      delete Ipl_IP_Img;
  
  64      delete IplClickPointStorage;
  
  65      cvDestroyWindow("Camera View");
  
  66      return;
  
  67    }
  
  68    
  
  69    int main()
  
  70    {
  
  71      while(1)
  
  72      {
  
  73          cout &lt;&lt; "Please Enter Video-Feed Address: ";
  
  74          cin >> videoFeedAddress;
  
  75          if(videoFeedAddress == "exit"){return 0;}
  
  76          cout &lt;&lt; "\nvideoFeedAddress: " &lt;&lt; videoFeedAddress &lt;&lt; endl;
  
  77          displayCameraViewTest();
  
  78          if(cvWaitKey(10) == 27){return 0;}
  
  79      }
  
  80      return 0;
  
  81    }
  
  </algorithm></chrono></array></streambuf></cstring></string></iostream></fstream>

  Using added ’cout’s I was able to narrow it down to line 38 : "cv_cap_IP.open(videoFeedAddress) ;"

  No value I enter for the videoFeedAddress variable seems to get a different result. I found THIS site that lists a number of possible addresses to connect to it. Since there exists no 7100 anywhere in the list & considering that the install is labeled "DCS-7010L" I used the addresses found next to the DCS-7010L listings. When trying to access the camera most of them can be reached through the browser, confirming that they reach the camera - but they don’t seem to affect the outcome when I use them in the videoFeedAddress variable.

  I’ve tried many of them both with and without username:password, the port number (554), and variations on ?.mjpg (the format) at the end.

  I searched around and came across a number of different "possible" answers - but none of them seem to work for me. Some of them did give me the idea for including the above username:password, etc stuff, but it doesn’t seem to be making a difference. Of course, the number of possible combinations is certainly rather large- so I certainly have not tried all of them (more direction here would be appreciated). Here are some of the links I found :

  1. This is one of the first configurations my code was in. No dice.
  2. This one is talking about files - not cameras. It also mentions codecs - but I wouldn’t be able to watch it in a web browser if that were the problem, right ? (Correct me if I’m wrong here...)
  3. This one has the wrong error code/points to the wrong line of code !
  4. This one mentions compiling OpenCV with ffmpeg support - but I believe 2.4.6.0 already comes with that all set and ready ! Otherwise it’s not that different from what I’ve already tried.
  5. Now THIS one appears to be very similar to what I have, but the only proposed solution doesn’t really help as I had already located a list of connections. I do not believe this is a duplicate, because as per THIS meta discussion I had a lot more information and so didn’t feel comfortable taking over someone else’s question - especially if I end up needing to add even more information later.

  Thank you for reading this far. I realize that I am asking a somewhat specific question - although I would appreciate any advice you can think of regarding OpenCV & network cameras or even related topics.

  ---

  TLDR : Network Camera and OpenCV are not cooperating. I’m unsure if
  it’s the address I’m using to direct the program to the camera or the
  command I’m using - but no adjustment I make seems to improve the
  result beyond what I’ve already done !