It requires: mpeg2enc ppmtoy4m pngtopnm

The first two are in the mjpegtools package for Ubuntu. Not enough pngtopnm. At the moment, I see in the console:

------------------ mkNoSignal.sh: 10: pngtopnm: not found INFO: [ppmtoy4m] Command-line Parameters: INFO: [ppmtoy4m] framerate: 25:1 INFO: [ppmtoy4m] pixel aspect ratio: 4:3 INFO: [ppmtoy4m] pixel packing: RGB INFO: [ppmtoy4m] interlace: none/progressive INFO: [ppmtoy4m] starting frame: 0 INFO: [ppmtoy4m] # of frames: 1, repeat last frame until done INFO: [ppmtoy4m] chroma subsampling: 4:2:0 MPEG-2 (horiz. cositing) **ERROR: [ppmtoy4m] Failed to read first frame. INFO: [mpeg2enc] SETTING EXTENDED MMX for MOTION! INFO: [mpeg2enc] SETTING SSE and MMX for TRANSFORM! INFO: [mpeg2enc] SETTING EXTENDED MMX for PREDICTION! **ERROR: [mpeg2enc] Could not read YUV4MPEG2 header: system error (failed read/write)! mkNoSignal.sh: 19: pngtopnm: not found INFO: [ppmtoy4m] Command-line Parameters: INFO: [ppmtoy4m] framerate: 25:1 INFO: [ppmtoy4m] pixel aspect ratio: 16:9 INFO: [ppmtoy4m] pixel packing: RGB INFO: [ppmtoy4m] interlace: none/progressive INFO: [ppmtoy4m] starting frame: 0 INFO: [ppmtoy4m] # of frames: 1, repeat last frame until done INFO: [ppmtoy4m] chroma subsampling: 4:2:0 MPEG-2 (horiz. cositing) **ERROR: [ppmtoy4m] Failed to read first frame. INFO: [mpeg2enc] SETTING EXTENDED MMX for MOTION! INFO: [mpeg2enc] SETTING SSE and MMX for TRANSFORM! INFO: [mpeg2enc] SETTING EXTENDED MMX for PREDICTION! **ERROR: [mpeg2enc] Could not read YUV4MPEG2 header: system error (failed read/write)! ---------------------- On the home page http://www.libpng.org/pub/png/apps/pnmtopng.html there is something, but I don't understand how is it to compile in linux. Where can I get a binary deb-package pngtopnm/pnmtopng?