Demuxer idf [iCE Draw File]:
    Common extensions: idf.
iCE Draw File demuxer AVOptions:
-linespeed         <int>        .D.... set simulated line speed (bytes per second) (from 1 to INT_MAX)
-video_size        <string>     .D.... set video size, such as 640x480 or hd720.
-framerate         <string>     .D.... set framerate (frames per second)

