[MEncoder-users] 23.976 --> 25 fps conversion problem

[Grozdan]

On Wed, Jun 30, 2010 at 2:51 PM, Tamas Selmeci <tselmeci at open-st.eu> wrote:
> On 06/30/2010 02:42 PM, Grozdan wrote:
>
>>> Is there any way I can produce 25 fps movie output from 23.976 fps
>>> material
>>> with frame interpolation/appropriate telecine/pullup? -vf pullup did not
>>> solve my problem. That annoying "stop" in movie flow must not be present
>>> at
>>> all.
>>
>> Not with mencoder. You can do the reverse (eg, 25 ->  23.976) but not
>> what you ask. There are no filters/ways current to do that with
>> mencoder
>
> That's a pity...
>
>> also note that -mc 0 *completely* disables the mencoder A/V sync algo,
>> so the probability of having sync issues increases (dramatically in
>> some cases)
>
> Yes, I also saw it in the manpage.
>
>>> (My rescue idea is to recode video at 25 fps without frame duplication,
>>> thus
>>> the movie duration will decrease by ~4% [23.976/25], and the audio is
>>> resampled at a 4% higher frequency to keep A/V sync)
>>
>> This is a very common used technique, even by major studios. They just
>> speed it up
>
> A 1-hour movie lasts ~2.5 minutes sooner with this technique, this is not
> that dramatic speedup that a spectator would realize. However, I'd like to
> resample audio to keep the pitch... mencoder refuses to resample my input at
> 50050 Hz (+4%):
>
> -af resample=50050:1:2 -srate 48000

you can use -af scaletempo which maintains the pitch - consult the man
page. Not sure if it works with mencoder, though. I never used it

>
> so I'll have to use other tools too.
>
> Regards,
> --
> Selmeci, Tamas
> http://www.open-st.eu
> _______________________________________________
> MEncoder-users mailing list
> MEncoder-users at mplayerhq.hu
> https://lists.mplayerhq.hu/mailman/listinfo/mencoder-users
>