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PODynamically generate list of arguments for ffmpeg in C
 

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  1. PODynamically generate list of arguments for ffmpeg in C
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    <p>I'm currently writing a video conversion daemon in C. It calls ffmpeg using execvp.</p> <p>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.</p> <p>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.</p> <p>Is there a better way to do this?</p> <p>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 **</p> <pre><code>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 &lt; 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 == . . . </code></pre>
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