Most transcoders, like HandBrake, can handle the dimensional and color encoding differences. The real trick is dealing with the 4% speed
up. I use ffmpeg with "-vf setpts=25025/24000*PTS" and "-af atempo=0.959040959040959", to slow the video and audio, respectively. This converts 25 fps to 24. Note that this assumes
the video is progressive. If it is telecined, interlaced, needs decimating, etc., you'll have to deal with those accordingly. Also, if the audio has been pitch-corrected for the speed
up, you may want to correct it again when you slow it down (I've never done this, but I think Audacity can).
Yes he's correct.
http://forum.doom9.org/archive/index.php/t-162343.html
Yeah, had same issue with Star Trek DS9 and Voyager DVDs (Europe). The original film material was filmed in NTSC, unfortunately the film matrial on those Europeen versions of those DVDs-ROMs has been gone through a NTSC-to-PAL conversion.
The conversed PAL version appears (a very little bit) worse than the transcoded film (xvid) from original NTSC-version.
I also bought the PAL-version as it has some Europeen languages. NTSC-version is only in English.
https://natecraun.net/articles/mplayer-tips.html
mplayer.exe -speed 960/1001 -fps 24000/1001
-speed 960/1001 is the PAL-To-NTSC-Speeddown-factor
-fps 24000/1001 is the NTSC framerate
When setting this option it plays with correct original NTSC-speed +correct framerate (in this case) and the audio height frequency went back to lower normal valual,
sounds the same when comparing it to an NTSC version of same episode
Still didn't have to change any monitor refresh rate.
The time display of duration still shows the shorter PAL film length, but the time second intervals in the time-display are actually moving slower, as if doubled (a very little bit)
This should also work:
mplayer.exe -speed 0.95904095904095904095904095904096 -fps 23.976023976023976023976023976024
But writing as ratio perhaps gives as much accurate result as possible (or just for easier writing than that long numbers)
----
PAL Speed =>25 fps
NTSC Speed=>23.976023976023976023976023976024 fps =>24 fps *1000/1001 => 24000fps/1001
NTSC-to-PAL-Speedup (PAL-Speed-result) = NTSC-Speed * (NTSC-to-PAL-Speedup-factor)
NTSC-to-PAL-Speedup-factor:
= PAL-Speed / NTSC-Speed
=>25fps / (24fps *1000/1001)
=>25 *1001 /(24 *1000)
=>25 *1001 /24 /1000
=>[25 *1001 *1/24 *1/1000]
=>1.0427083333333333333333333333333
NTSC-to-PAL-Speedup (PAL-Speedup-conversion-result):
= NTSC-Speed * [NTSC-to-PAL-Speedup-factor]
=>(24 fps *1000/1001) * [25 *1001 *1/24 *1/1000]
=>24 fps/24 *25 *1000/1000 *1001/1001
=>1 fps *25 *1000/1000 *1001/1001
=> 1 fps *25 *1 *1
=>25fps
----
PAL-to-NTSC-Speeddown:
=>PAL-Speed / [NTSC-to-PAL-Speedup-factor]
=>25fps / [25fps *1001 *1/24 *1/1000]
=>(25 fps/25) *24 *1000/1001
=>1 fps *24 *1000/1001
=>24fps *1000/1001
=>24000fps /1001
=>23.976023976023976023976023976024 fps
(Or other "way" for PAL-to-NTSC-Speeddown):
(PAL-Speed * PAL-to-NTSC-Speeddown-Factor)
PAL-to-NTSC-Speedown-Factor:
= NTSC-Speed / PAL-Speed
=>(24fps *1000 /1001) /25fps
=>24 *1000 / (1001*25)
=>24 *1000/ 25025
=>24000 / 25025
=0.95904095904095904095904095904096
=>24 *1000 / (1001*25)
=>24 *1000/25 *(1/1001)
=>24 *40 /1001
=>960 /1001
=0.95904095904095904095904095904096
PAL-to-NTSC-Speeddown ("a bit other" method):
=>PAL-Speed * PAL-to-NTSC-Speeddown-Factor)
=>[(24* fps *1000 /1001) /25fps] *25fps
=>24 fps *1000 /(1001*25)
=>24000fps / 25025
=>23.976023976023976023976023976024 fps
---------------------------
(PAL speedup-factor compared to lower NTSC)
=> 25fps / (24fps*1000/1001)
=> 25*1001/(24*1000)
=> 25 *1001 *1/24 *1/1000
=> 25/24 *(1001/1000)
=> 1.0427083333333333333333333333333 speed up factor
(1.0427083333333333333333333333333 -1) * 100%
=0.0427083333333333333333333333333 *100%
=>PAL 4.27083333333333333333333333333% faster than NTSC
and NTSC is
1 - (1 / 1.0427083333333333333333333333333) slower than PAL
=> 1 - 0.95904095904095904095904095904096
=> 0.04095904095904095904095904095904
=> 0.04095904095904095904095904095904 *100%
=> 4.095904095904095904095904095904%
=> 4.095904095904095904095904095904% slower