I generated thousands of still frames to turn into a video. Most were generated
with POVray under Debian Linux, but a few hundred were done with POVray for
Windows. The format is png. I notice the Windows png files are uniformly 2.6 MB
whereas the Linux png frames are in the range of 1.2 to 1.6MB. I can open the
Windows frames with Gimp under Linux, and then save them under Gimp, which will
reduce their size to the same as the Linux frames, and ffmpeg will then accept
them. But when I try to run ffmpeg, I get an error when it reaches the Windows
frames that have not been converted.

Is there some command or some app such as a Ruby script which will convert all
my Windows frames at once, so that I don't have to convert each one manually and
I don't have to generate them over again? Thanks.

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