avctx->subtitle_header = av_asprintf(
"[Script Info]\r\n"
"ScriptType: v4.00+\r\n"
+ "PlayResX: 384\r\n"
+ "PlayResY: 288\r\n"
"\r\n"
"[V4+ Styles]\r\n"
"Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n"