Back and Forth in a Loop

[jay123210599]

How do I videos go back and forth in a constant loop using ffmpeg and/or Shutter Encoder? Like, it plays normally, then goes reverse, then plays normally again, then goes in reverse again, and it goes on. Is it a lossless process?

See this gif (https://www.deviantart.com/juanrola/art/Nozomi-Ass-969255783) for an example. Now how do I do with this video (https://imgur.com/a/grab-3ZUzHLZ)?

[Selur]

Not totally sure I get what you want to do, but it sounds like to me that this is a player not an encoder problem.
I guess, one could create a video where the original video 1st plays forwards, then backwards and this video then is looped during playback.
Here's a HTML5 example: https://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_video_loop

Cu Selur