QuickTime error -50, (only on Mac Pro workstation)

Does anyone know what QuickTime error -50 means?
I'm getting this constantly on my Mac Pro 3.0Ghz workstation, (in Batch Monitor.) At the end of encoding about 3 hours of footage into iPod format, Batch Monitor begins to error on about 3/4 of the encodes left to do, beyond the 3 hours of footage that have already been processed.
I was told, (by Apple support) that it may be something to do with the hard drives, but they all check out just fine. I also have a G5/quad running the exact same version of compressor and there are no errors during processing, (in batch monitor) no matter how much footage is processed.
Here's my hard drive configuration on the Mac Pro as well as the G5/quad.
Boot drive, (running all of my Apps) internal drive on Mac Pro.
Xserve RAID 10TB, (used for source movie storage, in 10bit uncompressed format, AJA I/o codec.)
2nd drive, (used for storage of reference movies stored on RAID) internal drive on Mac Pro.
3rd drive, (used for storing final encoded movies) internal drive on Mac Pro.\
All software and OS X are new installs, (from original disks.) The drives have been completely erased, formated and new installs of all software, using nothing from the original installs on the Mac Pro, as well as updated to all current versions of software and still the problem persists only on the Mac Pro 3.0Ghz, (4 core) workstation.
Any guidance on the source of the QuickTime -50 error would be appreciated.

Thanks for the reply.
I tried a Google search, but to no avail, (no mention of QT error -50.)
I also looked at the error codes list you provided, but it would appear that those codes are related to OS X operation, (unrelated to QuickTime errors) but thanks for trying!
This is a very strange issue that has plagued me for as long as I have had this Mac Pro. I can take those files that failed with QT error -50, run them again and as long as there part of the first 3 hours of footage that is encoded on the Mac Pro, they will encode just fine. It is after that, that the wheels fall off and the QT -50 errors begin. Very frustrating as you can imagine.
I'm forced to run no more that three hours of footage at a time, limiting over the weekend encodes, on large batches of footage that needs to be transcoded into iPod format.
But again, thanks for trying, it is appreciated!

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Memory Module: DIMM Riser B/DIMM 3, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335
Memory Module: DIMM Riser B/DIMM 4, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x0198, -
Memory Module: DIMM Riser A/DIMM 3, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x80AD, 0x48594D5035313241373243503844332D5335
Memory Module: DIMM Riser A/DIMM 4, 1 GB, DDR2 FB-DIMM, 800 MHz, 0x0198, -
Bluetooth: Version 4.3.2f6 15235, 3 services, 26 devices, 1 incoming serial ports
PCI Card: ATI Radeon HD 2600, Display Controller, Slot-1
Serial ATA Device: WDC WD3200AAJS-41VWA0, 320.07 GB
Serial ATA Device: ST1000DM003-1CH162, 1 TB
Parallel ATA Device: OPTIARC DVD RW AD-7170A
USB Device: Hub
USB Device: Apple Cinema Display
USB Device: Keyboard Hub
USB Device: Apple Optical USB Mouse
USB Device: Apple Keyboard
USB Device: Bluetooth USB Host Controller
FireWire Device: built-in_hub, Up to 800 Mb/sec
FireWire Device: unknown_device, Unknown
Thunderbolt Bus:

Kernel panic, machine check, multiple error reporting banks, on a Mac Pro with Xeon processor with Error Correction Code Memory means Uncorrectable RAM memory error.
In a Mac Pro 3,1 your memory is in pairs in adjacent sockets. Single-bit errors are corrected in Hardware without any slowdown. Uncorrectable (double-bit) errors cause this distinctive kernel panic, machine check to keep from poisoning your data.
Use about this Mac > (More info ) > (Report) > Memory to view this STATIC report
Go about your business as usual.
At least every quarter hour, invoke the report again or Refresh its data.
When you get a report like this one, you have found your culprits:
graphic courtesy andandtech.com

How much UPS power for a Mac Pro?

I think if I buy a Mac Pro I'll need up grade my UPS. The electrical requirements don't specify the supply power, so I'm not sure how big my UPS should be. I want to purchase the smallest UPS possible to give me a few minutes of protection, but I don't want to buy a 100-pound monster if I don't have to.
I know that the actual power drawn depends on the specific configuration, so a Mac with four video cards will use more than the base model. I'm just hunting for an estimate.
I plan to get a 2.66GHz with a couple of hard drives and the base 7300 video card.
Thanks.

My personal Pro level favourites are the APC BACK-UPS RS 800VA, 1000VA and 1500VA models…
http://www.apc.com/products/family/index.cfm?id=23
The 800VA model is especially efficient and probably more suited to what you're after. The 1000VA model isn't the smallest UPS I've seen so be sure to clearly check the dimensions.
Remember that your UPS will be supplying power to not only uour Mac Pro but your display and other peripherals as well so stepping up a bit is well worth it.

HT1444 mac pro will not successfully load snow leopard

mac pro will not successfully load snow leopard 10.6 ? presently using 10.5

Haha! That's true. Though I've noted many users here calling a Power Mac a Mac Pro and visa versa.
When my Power Mac died and I brought it into the Apple Store to have them look at it, the first Mac Pros hadn't been out that long. Even the staff didn't know the tower Mac they had out on display was a Mac Pro. I pointed out that it had two optical drive bays in front. Only the Mac Pros have two. All Power Macs have only one.

QuickTime error -50, (only on Mac Pro workstation)

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