I try running ffmpeg from Java, and for a couple of moments everything is working fine. I want ffmpeg to record my screen, and split the recording into small clips. The command is working fine from the terminal, but when I run it from Java I get at most 3 clips. Ffmpeg doesn’t write anything to the InputStream, so I have no idea what’s going wrong.

My code is :

I have this code that automatically makes a couple of videos using ffmpeg. The result is 2 or 3 .mp4 files that consist of an audio and a still image. I want to concatenate these files automatically by using ffmpeg concat demuxer, but when the concatenation finishes the videos do concatenate, but the images are hyperimposed on top of one another. So instead of having 12 seconds of a cat image and 10 seconds of a skyscraper, I get 22 seconds of a cat image, and when I skip forward in the video the image changes to the skyscraper and doesnt change back.