Videos Going Back and Forth

[jay123210599]

How do I edit or adjust videos so they go back and forth like in these gifs I've found?

Gif 1 (https://www.deviantart.com/juanrola/art/Nozomi-Ass-969255783)
Gif 2 (https://www.deviantart.com/lavidademi/art/Keijo-butt-1143059281)
Gif 3 (https://www.deviantart.com/lavidademi/art/Keijo-butt-2-1143059521)
Gif 4 (https://www.deviantart.com/lavidademi/art/Keijo-butt-3-1143059919)
Gif 5 (https://www.deviantart.com/lavidademi/art/Keijo-cute-ass-1146539366)

Example videos to test out:
https://www.mediafire.com/file/y2s66vk9bi3j7bm/example_videos.7z/file

[huhn]

by using the original scene and add it in reverse to the end with a loop tag.

and are you alright?

[Z2697]

FFmpeg have a filter called reverse, but be careful it will read all frames into memory

LOL and are you alright?

[GeoffreyA]

Watch out: example 3 is prone to heavy banding :)

[jay123210599]

by using the original scene and add it in reverse to the end with a loop tag.

and are you alright?

How do I do that? And yes, I'm fine.

[jay123210599]

FFmpeg have a filter called reverse, but be careful it will read all frames into memory

LOL and are you alright?

How would that work? Is is a lossless filter? And yes, I'm fine.

[huhn]

the operation is lossless when a lossless encoder is used.
you also need to drop the last frame or it is displayed twice.

i have never done such a thing i only understand the theory.

so you take a clip save it lossless remove a frame from the start and apply the reserve filter and attach both clips, attach is also lossless in this case all is identical resolution frame rate everything.
there are other ways to do it and i have no clue which is faster without trying it out.

and now you have the clip that is about to be turned into a gif like any other clip.

[jay123210599]

the operation is lossless when a lossless encoder is used.
you also need to drop the last frame or it is displayed twice.

i have never done such a thing i only understand the theory.

so you take a clip save it lossless remove a frame from the start and apply the reserve filter and attach both clips, attach is also lossless in this case all is identical resolution frame rate everything.
there are other ways to do it and i have no clue which is faster without trying it out.

and now you have the clip that is about to be turned into a gif like any other clip.

What would the command be for the reverse filter? What can I use to reverse my videos?

[huhn]

ffmpeg -i inputfile -vf reverse outputfile

[jay123210599]

ffmpeg -i inputfile -vf reverse outputfile

Is the reverse filter a lossless one? Do I reverse the video where a cut a frame from the start?

[huhn]

if you use an lossless codec yes.

try it out.