Recherche avancée

Sur d’autres sites (5701)

• fate : add matroska-remux test.

  6 mai 2016, par Ronald S. Bultje

  fate : add matroska-remux test.
  This tests automatic insertion of the vp9_superframe BSF as well as
  
  ensuring that the colorspace properties in the video header can be
  
  modified when remuxing (-c:v copy).
  

  • [DH] tests/Makefile
  • [DH] tests/fate/matroska.mak

• Is there a MS-DRM client library for linux ?

  19 juin 2016, par qrtt1

  I have used the libraries (libavformat and libavcodec) to decode some MMS streaming urls. But some of them are protected by DRM. When I try to decode them, the library will warn about it

  In libavformat/asfdec.c :

  if (!s->keylen) {
  
      if (!guidcmp(&g, &ff_asf_content_encryption)) {
  
          av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
  
      } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
  
          av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
  
      } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
  
          av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
  
      }
  
  }

  The variable s is the struct AVFormatContext. My question is where to get the key ? It seems to decode it with a DRM key.

  ---

  I look the ASF Spec, and try to patch asfdec.c. Now, I have the acquiring license URL and key id. The problem can rewrite as ’Is there a MS-DRM client library for linux ?’ (old : How to decode a MMS streaming url with DRM by ffmpeg ?)

  Is it possible to use the license url and key id to get content key ?

• Redirect ffmpeg console output to a string or a file in C++

  21 juillet 2019, par NeoFahrenheit

  I’m trying to use ffmpeg to do some operations for me. It’s really simple for now. I want to omit the ffmpeg output in my console, either redirecting them to strings or a .txt file that I can control. I’m on Windows 10.

  I have tried _popen (with and "r" and "w") and system("ffmpeg command > output.txt")’, with no success.

  #include <iostream>
  
  #include 
  
  using namespace std;
  
  
  
  #define BUFSIZE 256
  
  
  
  int main()
  
  {
  
      /* 1.
  
      x = system("ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4 > output.txt");
  
      */
  
  
  
      /* 2.
  
      FILE* p;
  
      p = _popen("ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4", "w");
  
      _pclose(p);
  
      */
  
  
  
      /* 3.
  
      char cmd[200] = { "ffmpeg -i video.mp4 -i audio.mp4 -c copy output.mp4" };
  
  
  
      char buf[BUFSIZE];
  
      FILE* fp;
  
  
  
      if ((fp = _popen(cmd, "r")) == NULL) {
  
          printf("Error opening pipe!\n");
  
          return -1;
  
      }
  
  
  
      while (fgets(buf, BUFSIZE, fp) != NULL) {
  
          // Do whatever you want here...
  
          // printf("OUTPUT: %s", buf);
  
      }
  
  
  
      if (_pclose(fp)) {
  
          printf("Command not found or exited with error status\n");
  
          return -1;
  
      }
  
      */
  
  
  
  
  
      return 0;
  
  }
  
  </iostream>

  Further in the development, I would like to know when the ffmpeg process finished (maybe I can monitor the ffmpeg return value ?) or to display only the last line if the some error occurred.