[FFmpeg-user] fps not working as expected

[Andy Civil]

On 2012-10-06 11:14 PM, Carl Eugen Hoyos wrote:

> You want to specify an input frame rate, so please
> try putting "-r 30" in front of "-i".

Henry, the reason Carl told you to do this is that the default input frame rate 
for images is 25fps, so the command is reading your 900 frames, and making a 36 
second movie at 25fps. Then it finds the "-r 30" and duplicates enough frames to 
make a 30fps 36 second movie.

In an FFmpeg command line, order is important.

--
Andy