www.makemkv.com

I own the 11-Disc Region-Free Box set - "Harry Potter the Complete 8 Film Collection".
I used MakeMKV (v1.7.9 for winx64, installed under Windows 8 Pro, 64-bit) to make backups of all the disks. I chose the full backup option, just removing the encryption (not making MKVs).

The first 6 movies all worked flawlessly, but I'm having issues with "Harry Potter and the Deathly Hallows Part 1". MakeMKV doesn't generate any errors, but when I play back the file, there are several places where it appears corrupted (the scene freezes and stutters and get pixilation for 1-2 seconds). I encountered about 5 "bad spots" in the first 30 minutes of the movie (I stopped watching at that point and started troubleshooting, so not sure how many more there are).

If I rewind and re-play the "bad" segment, the problem persists in the same spot.
I have tried playing back on two PC's (one Windows 7, and one Windows 8) - problems stay in the same spots.
I have tried playing back with two programs (SageTV, and MPC-HC) - problems stay in the same spots.
I have tried using different codecs with SageTV (Microsoft and ArcSoft) - both exhibit problems in the same spots, but the ArcSoft codecs handle it better (less noticeable).
I tried re-creating the backup with MakeMKV (V1.7.9) - still see the same problems in the same spots.

I tried playing the original BD disc in a stand-alone BD player (Panasonic) and it plays correctly with no issues.

Is it possible that MakeMKV is corrupting the files when it decrypts the BD Disc?
What else can I try?

*Edit 1/22/2013*
I tried to re-create the backup using the new version of MakeMKV (v1.7.10). The results were the same - still having major issues with this disc. Has anyone seen a problem like this before?

Well, I found that Harry Potter and the Deathly Hallows Part 2 has the same symptoms... when I do a full disk back-up with MakeMKV, it corrupts the copy. There are numerous places throughout the movie where it stutters and pixelates like a corrupted h.264 file.

As an additional experiment, I used MakeMKV to create an MKV of the main movie, and guess what? It creates a clean rip with no problems during playback.

Why would it work correctly when creating an MKV, but not when creating a full-disc unencrypted backup?

It's a player problem.
If you created a full disc backup you should have seen a log line "will verify M2TS hashes". If you got no hashcheck errors, then your files are guaranteed not to be corrupt.

mike admin wrote:It's a player problem.
If you created a full disc backup you should have seen a log line "will verify M2TS hashes". If you got no hashcheck errors, then your files are guaranteed not to be corrupt.

But, if it's a player problem, why do I see the same problem in the same locations using multiple software programs with multiple codecs on two different PC's (PC's with different CPU's, graphics cards, and Operating systems)?

And why can I play numerous other BD rips on these same systems without problems?

Since a movie can be broken into multiple files (but doesn't have to be) and a playlist just tells the player which files to play and in what order, is it possible that these are occurring on the boundaries where a playlist stitches together two media files? If so, maybe the BD's that play back OK just happen to contain the complete movie in a single file, and the BD's that glitch have the movie segmented into multiple files? In that case, maybe some players handle those transitions better than others? If this were the case, I could understand your theory that the player is at fault. I wonder if there is an easy way to test this theory or if others have seen similar symptoms.