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Extracting frames from a video with ffmpeg very slow if not using jpeg
(discuss.tchncs.de)
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PNG is a rather slow algorithm based on the DEFLATE compression from zip/gzip. You could extract to bmp or some other uncompressed format. First, to ensure it is lossless, make sure it supports the video's pix_fmt without needing conversion.
going from YUV->RGB wont incur any meaningful loss, going from RGB -> YUV on the other hand can, but it's rare that it will actually happen so long as you arent messing up your bitdepth too much