Perhaps the table is not clear enought. I don't know about the exact members of each group, so I have to guess. I hope nobody get offended if misclassified.
Let's put Michael Niedermayer in his own group "A".
Clément Bœsch has no commits in libav and 179 in FFmpeg. So I guess he's in the FFmpeg team.
Andreas Cadhalpun has 21 in libav and 114 in FFmpeg . So I guess he's in the FFmpeg team.
I put all the persons who have more commits in FFmpeg than in libav in the FFmpeg team. Let's call this team "B". The classification is clear, because in all the cases the difference is big.
Vittorio Giovara has 294 commits in libav and 294 in FFmpeg. It's a tie! It's more difficult to guess, but I put him in the libav team. (This choice makes the bus factor bigger.)
Martin Storsjö has 253 in libav and 252 in FFmpeg. It's also difficult to guess, but I put him in the libav team.
I put all the persons who have more commits in libav in FFmpeg in the libav team. Let's call this team "C". Some cases are difficult to classify, but I choose the classification that makes the bus factor bigger.
In the table:
libav FFmpeg
A) 46 1831
B) 37 1071
C) 1074 856
Tot: 1157 3758
Ignoring the group A) and making a lot of assumptions, the table it can be read as
The persons in group B wrote 1071 commits for FFmpeg and 37 of them were copied to libav
The persons in group C wrote 1074 commits for libav and 856 of them were copied to FFmpeg.
The moral is that with the data of the table it's not clear that the group B is much smaller than group C. Only that group A is bigger than both!
Let's put Michael Niedermayer in his own group "A".
Clément Bœsch has no commits in libav and 179 in FFmpeg. So I guess he's in the FFmpeg team.
Andreas Cadhalpun has 21 in libav and 114 in FFmpeg . So I guess he's in the FFmpeg team.
I put all the persons who have more commits in FFmpeg than in libav in the FFmpeg team. Let's call this team "B". The classification is clear, because in all the cases the difference is big.
Vittorio Giovara has 294 commits in libav and 294 in FFmpeg. It's a tie! It's more difficult to guess, but I put him in the libav team. (This choice makes the bus factor bigger.)
Martin Storsjö has 253 in libav and 252 in FFmpeg. It's also difficult to guess, but I put him in the libav team.
I put all the persons who have more commits in libav in FFmpeg in the libav team. Let's call this team "C". Some cases are difficult to classify, but I choose the classification that makes the bus factor bigger.
In the table:
Ignoring the group A) and making a lot of assumptions, the table it can be read asThe persons in group B wrote 1071 commits for FFmpeg and 37 of them were copied to libav
The persons in group C wrote 1074 commits for libav and 856 of them were copied to FFmpeg.
The moral is that with the data of the table it's not clear that the group B is much smaller than group C. Only that group A is bigger than both!