I have just a couple of images ( 20-40 ) and I want make movie which plays with frame rate 1-2 fps ( i.e. each image should be visible for 0.5-1 second ) ... so the whole movie should take ~20-40 seconds to play. It seem that video generated using avconv with option -r 1 or -r 2 does not do this job :-( .

If I generate the movie in this way:

avconv -i ./relief_%04d.png -force_fps -r 1 -vf "scale=320:240" test.avi

I also tried option -force_fps it has no effect

it does strange things:

1. the movie plays just ~2 seconds ( instead of 20-40 seconds )


2. it does not show every images ( just 1-2 )


3. it is like very laggy

( and it is also a bit dependent on the player. mplayer do the strange things described above, vlc shows just black screen )