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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 ==
  
              .
  
              .
  
              .

• mov : fix decryption with edit list

  12 janvier 2017, par erankor

  mov : fix decryption with edit list
  Retain the ranges of frame indexes when applying edit list in
  
  mov_fix_index. The index ranges are then used to keep track of the frame
  
  index of the current sample. In case of a discontinuity in frame indexes
  
  due to edit, update the auxiliary info position accordingly.
  Reviewed-by : Sasi Inguva <isasi@google.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c

• How to use data from list of text files for FFMPEG livestream

  30 août 2022, par Steve Mimshak

  Is it possible to use a list of text files for FFMPEG livestream, i want to be able to update the data in text files in real time during the stream.