Yes, i think it's a bug in Gspot, it thinks that the video must be decoded in the combination of filters it beleives, but in real they can be played fine with Bsplayer with proper filtering route.
I hope you agree.
And some of filter combinations it claims are incorrect and are missing in Gspot, because proper filter combination is done fine by Bsplayer :-)
Note: Even old Gspot (2.2) has one rendering option and it works with no error.