This work combines time-resolved PIV and OH-PLIF to analyze the flame dynamics, from kernel initiation to flame stabilization. Ignition experiments are conducted for increasing hydrogen contents at fixed injection flow velocity U b = 5 m.s -1 and constant laminar burning velocity S 0 l = 0.25 m.s -1 . It was found that the trajectories of the flame leading edge after ignition changes as the H 2 content increases. For CH 4 -air mixtures, the flame is quenched near the injector outlet where the strain rate is high. In this case, the flame cannot penetrate inside the premixed jet exhausting from the burner nozzle and the reactive front is advected downstream along the burner axis. When the hydrogen content increases, stretch resistance grows and the flame front is able to propagate across the outer shear layer near the combustion chamber back plane. This difference between methane and hydrogen flame dynamics is found to be likely the cause of the different types of stabilization modes observed.