A friend of mine has a film of Django playing. It's what they used to call a "soundie". Today called a music video. The band is in a passenger car of a train while passengers crowd around the door and listen to them play "Dinah". You never get a really clear view of Django's left hand( as is the case with most photographs)but as near as we've been able to determine, when not soloing, he plays double stops, and octaves (much in the same way that Wes Montgomery did years later) with the left hand while strumming a two-beat rhythm with the right. The actual rhythm guitar time-keeping and chord voicing chores were handled by Django's brother Joseph.