I can refer you to some notes I made a while back about using AviSynth and MV tools to create slow motion footage which may help? - you can find them here: http://bit.do/slo-mo
Originally Posted by Francis Boige
Those notes were written for a 'non techy' person (my brother!) hence the 'left click here' - 'right click there' approach. As you will see, there's quite lot to the initial concept, but the actual application is simple enough.
You would need to apply a different script from the one suggested for the 'slo-mo', but the same concepts apply. The frame rate conversion script is much simpler, as you can read below.....
(That text file would need to be saved with an '.avs' extension to work as an AviSynth script)
# convert clip to 25fps
super = MSuper(pel=2)
backward_vec = MAnalyse(super, overlap=0, isb = true, truemotion=true, search=3)
forward_vec = MAnalyse(super, overlap=0, isb = false, truemotion=true, search=3)
MFlowFps(super, backward_vec, forward_vec, num=25,den=1,ml=100)
There should be no reason why the audio should lose sync.. the 25fps file will have the same duration as the 30fps orignal. Where this approach can lose sync is if you are trying to create a 25fps clip from a variable frame rate source. (Variable frame rates are a nightmare for this type fof process!)
As you can see, it's quite a lot to take in at first, but it is simple to do once it's set up .... whether you think it's worth the effort, only you can decide?.....
It's certainly cheaper than using Twixtor