Daanvandam wrote:It's obviously not SVP's doing, but I can't figure out what is. Perhaps Avisynth or ffdshow?
Well if it's still happening even with SVP closed then it shouldn't be Avisynth, which would only leave the likes of ffdshow. I have minimal knowledge with ffdshow, so I personally can't help you with that...
However, since it is occurring regardless of whether SVP is open or not, you could probably ask this in the Doom9 MPC-HC thread or similar and get advice from people way more experienced with the likes of ffdshow. Make sure you emphasize that it even happens with a fresh copy of MPC-HC 1.7.8 portable.
Here's a direct link to the thread for your convenience:
http://forum.doom9.org/showthread.php?t=166689
EDIT
Before you do that, in MPC-HC's built-in LAVfilters, try changing the hardware decoder to something other than one of the two "DXVA" options; from best to worst try "Intel QuickSync" (only if you have an LGA 1155 or 1150 Intel CPU), "Nvidia CUVID" (only if you have an Nvidia GPU that isn't ~8 years old), and "None".
Another thing you could always try is a fresh copy of MPC-BE. Note that there's no official portable version, so you'd have to go into the program options and enable "save settings in .ini". Also it does not have any built-in LAVfilters, so you may have to test without that...