I forgot to say that g_object_get(my_playbin2, "n-audio", nb_audio, NULL) give 0. But I think it's normal, because playbin2 warn me that he don't find any codec. -- View this message in context: http://gstreamer-devel.966125.n4.nabble.com/playbin-no-mp4-sound-tp4660684p4660904.html Sent from the GStreamer-devel mailing list archive at Nabble.com.