Makes an mpeg4 from sequence images in jpegdir, no scaling, use fast encoding
options, set bitrate to 10Mb/s, use 1 for qscale option (high quality),
framerate is 5 fps, force overwrite of existing output file, output file is
Where 2048x1024 is the new size that the image will be (should only be used
to reduce the size of an image, enlarging pictures reduces the quality). If you
use the same file name for the input and output, it will overwrite the input.