12/13/2022 0 Comments Open rar file using hjsplitSo, whilst getting QuickPar to verify the source files gaurantees that downloaders will be able to verify as well, they might not be able to repair. But since the repair packets never get used, this does not prove that they contain good data as well. If the verification of the original source files succeeds, then that implies that the verification packets in the par2 files must also contain good data. When you use QuickPar to verify, the packets containing verification data get used, but those containing repair data do not. The problem is that whilst the checksum can be used to determine if a packet has been corrupted, it cannot detemine if the data in the packet was good in the first place (i.e. ![]() ![]() The problem is that QuickPar's verification procedure is designed to verify the source files, and not to verify the par2 files.Īs you may know, a par2 file is a collection of packets of data, and every packet has its own checksum so that they can be individually checked for corruption. I definitely have automatic verification after par2 creation on my list of things to do, but there is a problem. > to automatically verify set of PAR2 files. > By the way you should think to add an option within QuickPAR to let the user > "Verify" because an error may have occur and I don't want people complaining > Also it is same when you create PAR2 files. We may forget to verify them ourselves, the eternal problem. )īy the way you should think to add an option within QuickPAR to let the user to automatically verify set of PAR2 files. At the end I always click on "Verify" because an error may have occur and I don't want people complaining about my PAR2 files being corrupted. Before posting 700Mb the least is to test your work, there is no hurry to post, take your time.Įven if you implement the solution you are talking about, posters will have to test their work or at least QuickPAR should implement an option to test files because the splitter, HJ-Split or so, can made an error.Īlso it is same when you create PAR2 files. Of course you can do it after the process, manually, but it may happens you forget to do it and this is what happens to people that never test their RAR files (rar or ACE or ZIP or whatever). When you create RAR, there is an option to tick so that when WinRAR start its job, at the end of the process it will automatically test all files. "some form of corruption occurred and that was never detected before the files were posted"Īs far as I know, this problem only occurs when the one that made rar files didn't test them. The important thing here from the downloaders point of view is that QuickPar both repairs and combines all of the split parts in a single operation. ![]() Obviously if some of the split files are incomplete then QuickPar will say that some recovery blocks are required, and once they have been downloaded, repair will be possible. When someone downloads the small par2 file plus the split files and uses QuickPar, they will be told that the video file is missing but that sufficient useable data has been found in the split files to be able to carry out a repair without the need for any more par2 files. It is vital in this instance to ensure that the split size used is an exact multiple of the par2 block size.ģ) Post the par2 files and the split files. The method I have been told of is as follows:ġ) Create PAR2 files from the original video (using a block size that is either equal to or an exact multiple of the article/segment size).Ģ) Create split files from the original video (using a pure splitter such as HJSplit or MasterSplitter and NOT WinRAR). When the split files are downloaded (and repaired if necessary using the PAR1 or PAR2 files), they must be recombined to obtain the original video. ![]() The normal method of using both PAR1 and PAR2 is to take the original video and split it (using RAR/ACE/HJSplit etc), then create PAR1 or PAR2 files from the split files. The technique described below does not work if RAR is used as the method of splitting files. Some posters have told me about an interesting new way of using PAR2 files when posting on UseNet that removes the need for downloaders to use file joiner to recover the original AVI/MPG etc.
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