OPT_DUR            71 libavfilter/asrc_sine.c     OPT_DUR("duration",          duration,               0, 0, INT64_MAX, "set the audio duration"),
OPT_DUR            72 libavfilter/asrc_sine.c     OPT_DUR("d",                 duration,               0, 0, INT64_MAX, "set the audio duration"),