i don't know if it's still an issue, but I know few year sago, if they had been encoded "Packed bitstream" they would play back jerky on some files. but if you used mpeg modifier
http://moitah.net/ on the file (on your pc0 it would convert it to non packed bitstream so would play on my divx/xvid standalone players without problem.
my divx player is cheap ~£30 from lidl a few years ago, and it does a great job.
my sitser in law has a LG DVD/hard drive recorder and she says that plays divx xvid files fine to.