Question about changing framerate without re-encoding (while changing the
duration too). In theory this is a very simple operation, the frame rate
is just an indication for the player. In practice it's no so simple to do
Is there a simpler solution than this two steps command :
'ffmpeg -i 30fps.mp4 -c copy -f h264 30fps.h264'
'ffmpeg -r 120 -i 30fps.h264 -c copy 120fps.mp4' ?
Why -r as an input option only works for raw streams?