Alexei Svitkine <[email protected]> added the comment:

Changed the byte at hex offset 0x14 in an interlaced file from 0x02 to 
0x04 will make it "pixel doubled" instead. This is the only change 
necessary (I confirmed by re-encoding a file twice - with the same 
setting except for these two flags).

I'll spare the upload since its a trivial change that can easily be done 
in a hex editor. (Also my FTP client is getting confused by not being 
able to list the directory to which it needs to upload to.)

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