I have frames extracted from video with 24 fps (I used ffmpeg), now I need to glue them back with the same frame rate. It should be free, preferably for Linux, but Windows or Android are also acceptable.
Why not use ffmpeg also?
For creating a video from many images:
ffmpeg -framerate 24 -i foo-%03d.jpeg foo.avi
edit: removed the -f image2 format as it is now optional, ffmpeg takes the format as guess from the input filename, but its still supported in case your filename does not have extension.
The syntax foo-%03d.jpeg specifies to use a decimal number composed of three digits padded with zeroes to express the sequence number. It is the same syntax supported by the C printf function, but only formats accepting a normal integer are suitable.