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Cannot decode the BD. Decoding stops to save the MKV on aprox. 487 MB.
Is there a solution?

Possibly. But, without information on what errors you're receiving, it's awfully hard to guess.

See the FAQ in my signature for more information on how to help us help you.

Sorry it took so long for my answer...
Of course you need some more informations. Here is the errorlog:

Saving 1 titles into directory F:/FILME und SERIEN/FILME/MUSIC/U2
Error 'Scsi error - MEDIUM ERROR:UNRECOVERED READ ERROR' occurred while reading '/BDMV/STREAM/00000.m2ts' at offset '613871616'
Error 'Scsi error - MEDIUM ERROR:UNRECOVERED READ ERROR' occurred while reading '/BDMV/STREAM/00000.m2ts' at offset '613871616'
DEBUG: Code 0 at Y|IF&],tF&yI9BW_ayAs:121263038
DEBUG: Code 0 at R}R^X=e:}TnPR/)k|fqy:121262302
DEBUG: Code 0 at Y|IF&],tF&yI9BW_ayAs:213130559
DEBUG: Code 299742 at Y|IF&],tF&yI9BW_ayAs:29393286
DEBUG: Code 0 at dTY}Ut\3Z+1[99lR]yBK&:29398967
DEBUG: Code 0 at dTY}Ut\3Z+1[99lR]yBK&:29398967
LIBMKV_TRACE: Exception: Error while reading input
Failed to save title 2 to file F:/FILME und SERIEN/FILME/MUSIC/U2/U2_360_At_the_Rose_Bowl_t02.mkv
0 titles saved, 1 failed


The disk is OK, there are no scratches and in my BR-Player I can play and look the disk.

Thank for your help.

Error 'Scsi error - MEDIUM ERROR:UNRECOVERED READ ERROR' occurred while reading '/BDMV/STREAM/00000.m2ts' at offset '613871616'

Hardware can't read disk.

Just because it "plays in BD player" does not mean the disk has no flaws... BD players, like DVD players, are programmed to ignore errors.

Thanks for your answer.

So the Disk is defect.

You can try cleaning and waxing the disk; I find it works for most "defective" disks my relatives return to me. I use furniture polish (Pledge brand, specifically). Spray on, rub in with a CLEAN finger until it starts to dry, then wipe off with a clean cotton or microfibre cloth.

Anything it does not "fix" probably needs proper resurfacing.