Do video players automatically force 16:9 to 4:3 until you manually change the aspect to 16:9. |
No, if the video has been encoded as 16:9 (with a pixel aspect ratio to match) then both standalone players and software players should switch.
How have you encoded your video? I'm betting this could be the source of your problem. Additionally, how is the person with the problem viewing the video, and do you have the same problem?