Imagine you have recorded a longplay, and the video file is 1.5 GB. You painfully upload it to the Longplays.org ftp server using several resumes, and then an admin tells you your file is corrupt.
You can either reupload your whole movie, or you can use PAR2 files.
PAR2 files are small(er) files that can be used to repair a corrupt file. Thus it is faster to upload PAR2 files to correct the corrupt video than to reupload the whole thing.
Here's how to do that:
The total size of the PAR2 files is smaller than the original video file. In this case, you get something like 150 MB. Notice that the first files are very small, and they get bigger and bigger near the end.
If you upload all PAR2 files to the same folder as your longplay, admins can use them to repare any corruption in the longplay file.
If you can afford it, that's the recommended procedure.
If you have a very slow connection, however, you can try and upload the first few (smaller) PAR2 files and keep the larger ones for later. There are chances that admins will be able to fix your longplay anyway. But it's rather a matter of luck, and you might be asked to upload more PAR2 files.
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