Muxer image2 [image2 sequence]:
    Common extensions: bmp,dpx,jls,jpeg,jpg,ljpg,pam,pbm,pcx,pgm,pgmyuv,png,ppm,sgi,tga,tif,tiff,jp2,j2c,xwd,sun,ras,rs,im1,im8,im24,sunras,xbm,xface.
    Default video codec: mjpeg.
image2 muxer AVOptions:
-updatefirst       <int>        E..... update the first image file (from 0 to 1)
-start_number      <int>        E..... set first number in the sequence (from 1 to INT_MAX)

