[FFmpeg-user] Is it possible to just change the fps flags?

[J. Scott Edwards]

Hello,

i have several videos that were created from film, one film frame to one
video frame, so it plays too fast (29.97 fps).  i have tried:

 ffmpeg -i input.avi -r 24 output.avi

But that re-encodes the video and the result is horribly pixelated.  It
seems all i really want to do is change the flag that says what the fps is
to playback, and leave all of the video frames as is.

While searching for a solution it appears that both the container and the
codec have a frame rate, is there some way to change both of them to 24
without changing anything else?

Thanks!