Lots of download that can't be repaired

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dm12345678
Posts: 2
Joined: 05 Nov 2017, 08:30

Lots of download that can't be repaired

Post by dm12345678 » 05 Nov 2017, 08:33

In the last weeks, I see a lot of downloads that fail repair.

Message for these is:
"repair completed but the data files still appear to be damaged"

Running par2 from command line also fails to repair these. Is this a known problem? Is there a new par format that isn't handled correctly?

hugbug
Developer & Admin
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Joined: 09 Sep 2008, 11:58
Location: Germany

Re: Lots of download that can't be repaired

Post by hugbug » 05 Nov 2017, 09:46

Could be disk corruption or memory error.

dm12345678
Posts: 2
Joined: 05 Nov 2017, 08:30

Re: Lots of download that can't be repaired

Post by dm12345678 » 05 Nov 2017, 17:43

Just transfered the files to another computer and tried to repair them with par2 command line tool. Same problem here: the files are being repaired, but still corrupted after the repair has been finished. So it seems to be a general problem.

hugbug
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Re: Lots of download that can't be repaired

Post by hugbug » 05 Nov 2017, 17:48

Of course damaged files will not be magically repaired after transfer on another media.

hugbug
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Re: Lots of download that can't be repaired

Post by hugbug » 05 Nov 2017, 18:11

Try downloading same nzb-files on another computer.

kloaknet
Posts: 329
Joined: 23 Jul 2014, 08:52

Re: Lots of download that can't be repaired

Post by kloaknet » 06 Nov 2017, 11:27

might had something similar lately. During download I turned of the main provider (backups work properly), download didnt continue, restarted, download continued ok, ~99% available, repair fails. Redownloading same nzb again, without interference, worked ok. Have seen this 3 times in the last month or so.

Safihre
Posts: 4
Joined: 06 Apr 2016, 11:38

Re: Lots of download that can't be repaired

Post by Safihre » 06 Nov 2017, 11:58

@hugbug I also have reports of this from SABnzbd and was able to reproduce it.
Par2cmdline/par2tbb/Multipar/NZBGet all fail in same way, repair is started, but after repair they are still damaged.

There is something wrong with these Par2 files. So far I have been able to identify that they were all created using ParPar, so I created an issue with animetosho, also including an example NZB to showcase the problem.
https://github.com/animetosho/ParPar/issues/9

hugbug
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Re: Lots of download that can't be repaired

Post by hugbug » 06 Nov 2017, 12:36

Thanks for the info. I can confirm the test nzb-file isn't repairable.

On the linked GitHub ParPar issue tracker Anime Tosho (the author) has confirmed the issue and hopefully will fix it soon.

hugbug
Developer & Admin
Posts: 7090
Joined: 09 Sep 2008, 11:58
Location: Germany

Re: Lots of download that can't be repaired

Post by hugbug » 06 Nov 2017, 21:59

Implemented a "fix" - https://github.com/nzbget/nzbget/issues/467.
That's not a real fix of course, just an extra info helping to identify such problems in the future.

@Safihre: thanks for the info. I could have long time debugging this.

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