Is Syria's official opposition a serious force?

There are opposition groups inside Syria, but like their counterparts outside the country, they have not managed to come together under a united message.

Then there are other groups who claim to be opposition, and yet seem to be favoured by the regime.

The BBC's Lina Sinjab attends a gathering in Damascus called the Force for Peaceful and Democratic Change, where none of the groups wanted President Bashar al-Assad to go.