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I ended up ripping a movie that offered 2d playback on the same disk and noticed that there's two playlists. One is the 3D segment map which has pairs and the other doesn't have 3D as an option which doesn't have paired segments.

Thanks for the details response Luekg. I wasn't aware that this is primarily a 2D to 3D conversion artifact. I figured since it was only noticeable on the left that maybe it was related to one of the channel creating the depth effect which was possibly the left channel since the right side never mov...

I attempted to rerip the first captain america without the 3d frame and it also did the same thing with a older version of makemkv. 1.10 i think. So i guess this is an issue with 3d movies which do not allow 2D playback on bluray players i'm thinking.

Pic 1 shows the letterbox correctly, then is movies to this position in pic 2

I noticed recently that playback of ripped 3d frame packed movies have an issue with playing back in 2D where the aspect ratio changes, scene to scene. Is this a bug? Or a known issue? Any marvel movie with the opening title sequence will show what i mean. I searched to see if anyone had this issue ...