repair fails repeatedly

Technical support and discussion of Newsbin Version 6 series.

repair fails repeatedly

Postby RayMark » Sun Dec 09, 2018 12:21 pm

It sometimes happens that repair fails repeatedly, attempt after attempt, keeping downloading more and more par2 files, trying again, and again failing.
And finally I have many files .1, .9,..., .10 and still no successful repair.
While MultiPar successfully repairs the files at the first attempt without any problems.

What is the reason for this?
A bug in NewsBin or something justifiable?

I came across this problem yet again, I will pm you the specifics.

UPDATE:
P.M. sent.

Sometimes there is a different situation - when there are some duplicated files posted and NewsBin gets confused and is not able to repair the files. In such situations sometimes MultiPar just renames some files without any repairing and done - all the files are correct! But NewsBin is not able to keep track of its own renaming, it seems.
But in this case here, there are no duplicate files, and still the repair fails.
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Re: repair fails repeatedly

Postby Quade » Sun Dec 09, 2018 2:55 pm

If there's something wrong with the rars, it'll attempt a repair after each par downloads. Basically a failed unrar will trigger another PAR and repair attempt.

I saw a case the other day where everything was good in the download but it kept trying to repair and unrar. The problem was that a RAR was missing from both the listing AND the PAR files so, there was no possible way to get a good unrar. I've also seen cases where the par was generated over already damaged RARS so any repair would simply re-create the already damaged PARS.

Basically what you're describing is what happens when something goes wrong. Newsbin keeps trying till you run out of PAR files.
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Re: repair fails repeatedly

Postby mimauk » Sun Dec 09, 2018 4:34 pm

I've had this problem a few times over the years due to bad posts.

I go to the download folder with all the rar files and unrar them manually by double clicking on the first rar file, then clicking the "extract to" button and when the popup window appears make sure that "keep broken files" is checked in the miscellaneous section of the popup. You can then look at the unrared file to see if it is worth worrying about.

Is it possible to have the "keep broken files" option enabled in NBPros autounrar?
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Re: repair fails repeatedly

Postby RayMark » Sun Dec 09, 2018 7:51 pm

I am not speaking about such cases here. Yes, I've seen them too. With missing rar parts or "packed data crc failed" in rar parts even when par2 set says everything is OK.
No, here are different cases:

1. When everything is fine with par2 set, enough par2s to repair and the post can be repaired but it is not.
2. Same as 1 but when there are perhaps some reposts or something - some dupes are confusing NewsBin, perhaps because it itself renamed the original files while handling them - and it still cannot successfully repair even when there is nothing to repair - to rename correctly is enough. Or sometimes there is something to repair but those dupes are confusing NewsBin.

In both those cases stand-alone MultiPar solves the problem.
I gave Quade some examples of 1. I do not remember now the cases of 2 (with some dupes), but I had quite a lot of them too. Maybe I will encounter such a case again and will be able to give it to Quade.

Again, when the posted rars cannot be fully repaired by the provided par2s and/or are incorrectly indicated as OK when they are not - I have no questions about those cases.
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