Video Upside down in Avidemux?

[Jsbeckton]

I have several videos that I want to combine in Axidemux and for some reason one of the videos is upside down in the program. This video does not appear upside down in any other media player. What could cause this and how can I fix it? Thanks!

[jagabo]

Vertical Flip or Rotate 180 degrees, whichever is appropriate.

[Jsbeckton]

Vertical Flip or Rotate 180 degrees, whichever is appropriate.

Understand how to fix. Just wondering what caused this?

[jagabo]

Some containers have orientation flags (most smartphone videos for example). But not all players/editors pay attention to those flags. Some containers default to top-to-bottom, others to bottom-to-top. Some indicate bottom-to-top by using a negative height value. For example instead of indicating a frame size of1920 by 1080 they will say 1920 by -1080. Again, some editors/players respond to such indicators, some not.