AniDB

Well I found it more funny than realy bad but.

avdump marks files with 720x576 (<- DVD PAL Resolution) as "Unkown (aka not common)"

*lol* nice joke DVD PAL should be very very common ^^.

That's likely because of missing A/R information.

PAL doesn't use square pixels and the video usually need to be scaled before viewed on a computer monitor.