This tool is incomplete. The alternative utility you are probably looking for is ppmtoy4m(1), which is also included in MJPEGtools.

-b num

Frame offset: skip output of the first 'num' frames. (default: 0)

-f num

Set the frame rate of stream accepts the same numbers. Not default, this option has to be specified.

-I num

interlacing mode: p = none / progressive t = top field first b = bottom field first No default, this option has to be specified.

-L num

0 = non-interleaved (two successive fields per PNG file) 1 = interleaved fields

-l num

Specifies the number of loops (default: 0 loops )

-S samp_mode

chroma subsampling mode, only for professionals, for more info see ppmtoy4m and the YUV guide on http://www.mir.com/DMG/. default: 420_jpeg When this option is not used the given range of images is only processed once. If you use this option and as number 1, jpeg2yv will loop forever writing the image to stdout. When you use n > 1 it will loop. n-time till it finishes.

-n num

Specifies the nummber of frames to process. (default: all = -1)

-j {1}%{2}d{3}

Read PNG frames with the name components as follows: {1} PNG filename prefix (e g: picture_ ) {2} Counting placeholder (like in C, printf, eg 06 )) {3} File extension. Something like this: .png A correct description of the files could look like this: picture_%06d.png

-v num

Verbosity level (0, 1 or 2)