Alright this is getting out of hand.
I can understand @Cats4U's frustration as i clearly said open a new thread and all that was done was refer to the thread i closed and the title is not even the issue, as stated by @Brozilla
It is not about the Quicktime so the title shouldn't have been quicktime and i believe this whole back and forth would have been avoided. Now let's all move on.
So, let me clarify what steps can be taken to alleviate your concerns @Brozilla :
- Write up a text file with examples of Titles/Episodes where this happens
- Save the FULL TXT output from MediaInfo on a bad file
- Take the StreamFab.log, the list of titles, and the MediaInfo output and zip them up with a Zip password. The password should be the email address associated with your forum account. All lowercase obviously.
- Post it here
Only people who can see your email address are Me, Mona and Wilson so that takes care of your privacy concerns.
For the corruption problem, you have stated it is not reliably reproduceable. That makes it very very difficult to find the root cause. I can tell you some of the steps i would take to try to figure it out...
- Run a chkdsk /f [DRIVE:] drive being the drive letter where you output your media. Cross-linked entries can happen when killing programs, power loss or improper shutdowns
- Run Hard Disk Sentinel on the output drive to see if you have an S.M.A.R.T. issues or bad sectors. If you have bad sectors that have not been marked or reallocated, then that would most certainly be the problem.
I remember having maybe 1-2 corrupted files out of every 100 i would download and once i saw that creep up, i did find some cross-linked entries that chkdsk fixed. They are now much rarer and StreamFab doesn't "charge" you a download credit if you re-download the same thing on the same day. It's of little solace if you just want working files but my routine includes verifying all my downloads but only on the surface. Maybe you can use the same setup so you can quickly find the bad files.
I do this with
Icaros. Icaros will let you display thumbnails in windows explorer for files that are not natively supported by explorer. That's fine but there are a lot of other utilities that do this. The real power of Icaros is adding data in the shell extensions:

As you can see, i have all the fields needed to decide if i need to re-download any file.
The size might seem off, the length might be off, the wrong coded might be used, resolution could be something i didn't select, same for audio, missing subs or crazy low/high bitrates.
Here is an example of a clearly corrupted file:

You can see the episode is only 7 minutes when it should be 40 minutes and the bitrate is ridiculous as it is like a UHD Blu-ray bitrate.
When you install and activate Icaros for MP4 and MKV files, you now have data in a ton more detail fields for explorer. These are the ones i use:

So until StreamFab figures out the issue, that is unfortunately all i can do to help. A quick and easy way to see what files may be corrupted. I apologize for this but as a developer myself, i know all too well those bugs that only happen once in a while and can't be reproduced even if you retry right away are killers.