Frame multiplying

[Fantasio]

Hello everybody. I'm going to make a strange request, so please forgive me.

I've got a video, an mkv encoded with h264 (mp4). It's a video I took myself, and shows a chessboard during a game. Problem is, I made use of a webcam and a tablet, and because of several reasons, I could just record one frame per second, sometimes less. What I'd like to do is "inflate" the video in order to make it longer, repeating every single frame several times. That means if the frames in the original video are: 123456789etc., I'd like something like 11111222223333344444etc., that is the same video, but 5 times slower. I need all these frames because I'm doing a certain analysis of the video, that requires the frames not to change too often; usually I'm able to take a video at 6fps, and that's good, but in this specific case something went wrong.
Does anybody know of a software capable of doing such a thing?

Thanks.

[Secoast]

Google Avidemux win64 nightly. Download last in list (portable).

Open file in Avidemux.
Under Video Output change Copy to mpeg4 AVC (x264).
Select Filters, then Resample FPS. Under New Frame Rate multiply current framerate by number of additional frames required.
Save output.

[Fantasio]

Open file in Avidemux...

That works! I had no idea Avidemux could do such a thing. Thanks a lot! The analysis got much better and, where it still fails, I've now got time (and data) to look into.

[Secoast]

You can change the Presentation Time Stamps to slow down without adding additional frames, or re-encoding, but Resample FPS adds additional frames, which can be useful sometimes.