[MPlayer-users] Reverting a bad framerate change
Nicolas George
nicolas.george at normalesup.org
Fri Jun 15 21:02:22 CEST 2007
Hi. Thanks for your reply. But...
Le septidi 27 prairial, an CCXV, RC a écrit :
> -vf framestep if the interval is always consistent,
It only accepts integers.
> otherwise -vf
> decimate with a lot of trial-and-error to get the right parameters.
The transition frame seems to be a mean of its neighbors. Therefore, the
difference of the transition frame in high-motion scenes is higher than the
difference of normal frames in low-motion scenes.
Furthermore, none of your proposals adjust the presentation timestamps, and
this is absolutely necessary: dropping the transition frame without
adjusting the others is worse than nothing.
Let me explain with a 5/4 ratio. Here are the frames:
A B @ C D E F @ G H I J @ K LLLL
On screen, it looks like that (I keep the original for reference):
A B @ C D E F @ G H I J @ K L
AAAABBBB@@@@CCCCDDDDEEEEFFFF@@@@GGGGHHHHIIIIJJJJ@@@@KKKKLLLL
If you just drop the @ frame, you get that:
A B @ C D E F @ G H I J @ K L
A B C D E F G H I J K L
Which, on screen, looks like that:
A B @ C D E F @ G H I J @ K L
AAAABBBBBBBBCCCCDDDDEEEEFFFFFFFFGGGGHHHHIIIIJJJJJJJJKKKKLLLL
What you need is:
A B @ C D E F @ G H I J @ K L
A B C D E F G H I J K L
Alas, do not even know if a video filter can change the presentation
timestamp of the frames.
Regards,
--
Nicolas George
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