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• Dynamically generate list of arguments for ffmpeg in C

  5 mars 2013, par OregonTrail

  I'm currently writing a video conversion daemon in C. It calls ffmpeg using execvp.

  I've created a struct called "ffmpeg_job" that represents a conversion job to be completed. I'd like to dynamically allocate the arguments to ffmpeg for each job, so that I can free one of these structs and its list of arguments after the job is completed.

  I started writing the function that dynamically allocates the list of arguments, but I feel like the way I'm going about it is quite naive. The code is below.

  Is there a better way to do this ?

  EDIT : I'm thinking now that I will have a static string list of arguments for each level of quality, then sprintf into it and strtok it into a char **

  char ** generate_arguments(
  
      char *filepath,
  
      ph5v_format format,
  
      ph5v_quality quality)
  
  {
  
      char ** arguments;
  
      if (format == ph5v_MP4) {
  
          mp4_arguments = {
  
              "-i", "%%INPUT FILEPATH 1",
  
              "-vcodec", "libx264",
  
              "-preset", "%%X264 PRESET 5",
  
              "-b:v", "%%VIDEO BITRATE 7",
  
              "-strict", "-2",
  
              "-acodec", "aac",
  
              "-b:a", "%%AUDIO BITRATE 13",
  
              "-ar", "%%AUDIO SAMPLERATE 15",
  
              "-ac", "2",
  
              "-y", "%%OUTPUT FILEPATH 19"
  
          }
  
  
  
          arguments = malloc(sizeof(char*) * 20);
  
  
  
          int i;
  
          for (i = 0; i < 20; i++) {
  
              if (i == 1) {
  
                  char *argument = malloc(strlen(filepath) + 1);
  
                  strcpy(argument, filepath);
  
                  arguments[1] = argument;
  
              } else if (i == 5) {
  
                  if (quality == ph5v_LOW || quality == ph5v_MEDIUM) {
  
                      char *argument = malloc(strlen("fast") + 1);
  
                      strcpy(argument, "fast");
  
                      arguments[5] = argument;
  
                  } else if (quality == ph5v_HIGH || quality == ph5v_ULTRA ) {
  
                      char *argument = malloc(strlen("medium") + 1);
  
                      strcpy(argument, "medium");
  
                      arguments[5] = argument;
  
                  }
  
              } else if (i == 7) {
  
                  if (quality ==
  
              .
  
              .
  
              .

• setTimeout() fix for onfinish()-related issue where subsequent play() calls fail when Flash Player 11.6.602.171 is installed, and using soundManager with flashVersion = 8 (which is the default).

  3 mars 2013, par scottschiller

  m script/soundmanager2-jsmin.js
  m script/soundmanager2-nodebug-jsmin.js
  m script/soundmanager2-nodebug.js
  m script/soundmanager2.js
  

  setTimeout() fix for onfinish()-related issue where subsequent play() calls fail when Flash Player 11.6.602.171 is installed, and using soundManager with flashVersion = 8 (which is the default).
  Not sure of exact cause. Suspect race condition resulting in an invalid (NaN-style) position argument trickling down to the next JS -> Flash _start() call.
  Fix : setTimeout() to yield, plus safer null / NaN checking on position argument provided to Flash.
  https://getsatisfaction.com/schillmania/topics/recent_chrome_update_seems_to_have_broken_my_sm2_audio_player

• avcodec/tdsc : use ff_codec_open2_recursive()

  13 mars 2015, par Michael Niedermayer

  avcodec/tdsc : use ff_codec_open2_recursive()
  Fixes assertion failure and race conditions
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/tdsc.c