Hello ,
i have bought a NTSC DVD specificlly for 24p playback and with Mono Audio track<
now have made a backup copy with makemkv
but the resulting .iso would always "fall back" to playback at 59, fps <
is this a limitation of MakeMkv software or would i need a specific software , hardware to make the backupped .iso playback at 24fps?
thank you very much.
backup .iso / 24p playback
Re: backup .iso / 24p playback
"NTSC 24p" (aka 23.976p) DVD normally (if not always) come with "soft pulldown" which are "instructions" / metadata that are embedded through out the MPEG-2 video stream (for turning the NTSC 24p to some sort of NTSC 30p/60i "hybrid"). The Matroska muxing from MakeMKV would normally store a "default duration" to indicate a frame (interlaced in any sense or not) rate of 29.97 fps.
(Note that in reality, with "soft pulldown" you won't actually see interlaced frames / "weaved fields", at least not with the usual case of 60Hz "progressive scan". Instead of "weaving" lines from them, half of the frames would linger for 3Hz instead of 2Hz: 12*2 + 12*3 = 60.)
The most ideal thing to do is IHMO removing the "soft pulldown" from the raw MPEG-2 video stream (extracted from the original remux) and mux it again (with e.g. mkvtoolnix). However I only faintly remember there's one program (tsmuxer or something, idr) that has such feature. Also this might be what you want to do only if the stream is a "clean pulldown" (i.e. it doesn't have fragments that are actually 60i material or "garbage" resulted in the pulldown process or so). (I actually wrote a little nasty C program myself for the task. IIRC the "public" program I mentioned didn't exactly do everything it should do as per the spec.)
Consumer / hardware player can / will often detect to ignore the pulldown when a disc is being played, but the logic / heuristics often will not be triggered when you play an MKV or so with pulldown. (In my experience)
Not really sure about cases of software players.
(Note that in reality, with "soft pulldown" you won't actually see interlaced frames / "weaved fields", at least not with the usual case of 60Hz "progressive scan". Instead of "weaving" lines from them, half of the frames would linger for 3Hz instead of 2Hz: 12*2 + 12*3 = 60.)
The most ideal thing to do is IHMO removing the "soft pulldown" from the raw MPEG-2 video stream (extracted from the original remux) and mux it again (with e.g. mkvtoolnix). However I only faintly remember there's one program (tsmuxer or something, idr) that has such feature. Also this might be what you want to do only if the stream is a "clean pulldown" (i.e. it doesn't have fragments that are actually 60i material or "garbage" resulted in the pulldown process or so). (I actually wrote a little nasty C program myself for the task. IIRC the "public" program I mentioned didn't exactly do everything it should do as per the spec.)
Consumer / hardware player can / will often detect to ignore the pulldown when a disc is being played, but the logic / heuristics often will not be triggered when you play an MKV or so with pulldown. (In my experience)
Not really sure about cases of software players.
Last edited by tomty89 on Tue Jun 09, 2026 2:32 pm, edited 2 times in total.
Re: backup .iso / 24p playback
thank you,
this does seem a task abov e my current paygrade;
with the older bluray player can playback the dvd in 24p, but the option need to be directly enabled during playback ("24p playback ON")
guess then also commercial solution like zappiteio etc. will not do the feature here at hand,
so the only option would remain to make a 1:1 copy backup copy of the DVD and store it away, should the original go bad;
sadly , the network streaming of the .iso will be harder to achieve, but it seem you have already achieved it once or so.
this does seem a task abov e my current paygrade;
with the older bluray player can playback the dvd in 24p, but the option need to be directly enabled during playback ("24p playback ON")
guess then also commercial solution like zappiteio etc. will not do the feature here at hand,
so the only option would remain to make a 1:1 copy backup copy of the DVD and store it away, should the original go bad;
sadly , the network streaming of the .iso will be harder to achieve, but it seem you have already achieved it once or so.
Re: backup .iso / 24p playback
My only consumer player (Sony UBP-X700) doesn't support ISO playback (AFAIK), which was at least one of the reasons that I wrote a program for removing soft pulldown on MPEG-2 video. The other way to go would be to play the disc or a burnt copy (especially with region code problem considered) directly.
Re: backup .iso / 24p playback
apparentely the UHD Bluray player are no longer capable of playing DVD in 24p;
thats what the infamous AI helper told ;
could verifzy but only for panasonic device , where as on the 450 uhd player it would not function, it would on the older 108ßp bluray like 185 (after enabling the option during playback).
now am wondering if it is legit to make a backup copy of the DVD for home use?
is this even possible with all those DVD copy protection onplace? and the other software anyDVD copy or what gone out of town?
have once inquired if bluray player can playback .iso files, apparently there are none;
maybe someones that have been modified;
thanks.
thats what the infamous AI helper told ;
could verifzy but only for panasonic device , where as on the 450 uhd player it would not function, it would on the older 108ßp bluray like 185 (after enabling the option during playback).
now am wondering if it is legit to make a backup copy of the DVD for home use?
is this even possible with all those DVD copy protection onplace? and the other software anyDVD copy or what gone out of town?
have once inquired if bluray player can playback .iso files, apparently there are none;
maybe someones that have been modified;
thanks.
Last edited by kapqa on Tue Jun 09, 2026 8:53 pm, edited 1 time in total.
Re: backup .iso / 24p playback
Well the Sony player I have is a UHD BD player. IIRC I have once tested it with an NTSC 24p DVD, and it does trigger 24p playback and 24Hz output. (I don't remember if I have tested whether it still does so if I enable 4K upscaling.)
At the end of the day it's all about whether there's any "triggering logic" in the firmware. For example this player I have would do something silly for 25p materials. When I do not enable 4K upscaling it will output at 60Hz and "sync" the video against that, but when I do it will output at 25Hz (instead of 50Hz) if the TV supports that.
When you make "backup" of a DVD, you can either make a "verbatim" one that has the CSS encryption intact. (I don't really know if MakeMKV has that option for DVD but it is generally possible at least.) However when used to create a burnt copy it will likely be useless for "proper" (such as one from big brands like Sony and Panasonic) consumer player (that has no "crack" or whatsoever for CSS). "Legit" CSS decryption requires some data from "non-LBA" area from a disc, which normally cannot be included in a backup / burnt. With that said the encrypted backup can still be decrypted with libdvdcss or so because brute-force attack for CSS is a piece of cake to modern computers.
Therefore if you want to make "generally playable" copy of a disc you should make one from a decrypted backup. (You might still need / want to change the region code that is stored in certain files. I don't know if MakeMKV does that for you.)
P.S. In case you are not aware of it, MakeMKV allows you to make (decrypted) backup of a DVD in addition to making MKV remux of it. There's also libdvdcss frontend like dvdbackup for someone who prefer open source solution.
At the end of the day it's all about whether there's any "triggering logic" in the firmware. For example this player I have would do something silly for 25p materials. When I do not enable 4K upscaling it will output at 60Hz and "sync" the video against that, but when I do it will output at 25Hz (instead of 50Hz) if the TV supports that.
When you make "backup" of a DVD, you can either make a "verbatim" one that has the CSS encryption intact. (I don't really know if MakeMKV has that option for DVD but it is generally possible at least.) However when used to create a burnt copy it will likely be useless for "proper" (such as one from big brands like Sony and Panasonic) consumer player (that has no "crack" or whatsoever for CSS). "Legit" CSS decryption requires some data from "non-LBA" area from a disc, which normally cannot be included in a backup / burnt. With that said the encrypted backup can still be decrypted with libdvdcss or so because brute-force attack for CSS is a piece of cake to modern computers.
Therefore if you want to make "generally playable" copy of a disc you should make one from a decrypted backup. (You might still need / want to change the region code that is stored in certain files. I don't know if MakeMKV does that for you.)
P.S. In case you are not aware of it, MakeMKV allows you to make (decrypted) backup of a DVD in addition to making MKV remux of it. There's also libdvdcss frontend like dvdbackup for someone who prefer open source solution.
Re: backup .iso / 24p playback
glad to hear it could function with the Sony pleayer,
since was pondering to buy one /K version,
have not known previously it exist, and the non-wifi Bluray Player are not so many;
strange thing is, the own Sony AI Agent claims straighforward that Netflix-Prime Apps are enabled for the /K version aswell, but then the service support says otherwise.
Will look for a time when make a backup of a DVD, just for trying;
thank you for sharing , will remember the post and look back if needed.
it would have been nice for the 24p playback over the network, but can understand that the .iso playback is not adopted by the industry.
I live in Europe and hence the NTSC DVD 24p thing is just a niche thing here altogether since it does not apply to PAL DVD ( another hint the moreandmore ubiquitous AI Agent gave).
still learning ways of using makemkv software;
the backup are usually playable , which is very nice;
only one Bluray found that the backup .iso would not play, neighter in CoreElec nor in LibreElec , which are my favorite tool for playback over the network;
the bluray player playback .mkv files quite nicely, but sadly struggle with subtitle support (atleast the Panasonic do, Samsung seem to fare better but may have exited the market).
since was pondering to buy one /K version,
have not known previously it exist, and the non-wifi Bluray Player are not so many;
strange thing is, the own Sony AI Agent claims straighforward that Netflix-Prime Apps are enabled for the /K version aswell, but then the service support says otherwise.
Will look for a time when make a backup of a DVD, just for trying;
thank you for sharing , will remember the post and look back if needed.
it would have been nice for the 24p playback over the network, but can understand that the .iso playback is not adopted by the industry.
I live in Europe and hence the NTSC DVD 24p thing is just a niche thing here altogether since it does not apply to PAL DVD ( another hint the moreandmore ubiquitous AI Agent gave).
still learning ways of using makemkv software;
the backup are usually playable , which is very nice;
only one Bluray found that the backup .iso would not play, neighter in CoreElec nor in LibreElec , which are my favorite tool for playback over the network;
the bluray player playback .mkv files quite nicely, but sadly struggle with subtitle support (atleast the Panasonic do, Samsung seem to fare better but may have exited the market).
Re: backup .iso / 24p playback
If there's just one DVD you particularly want to make 24p playback working (in mkv), you can PM me and share either the backup or mkv remux of it with me (through e.g. Google Drive). (Don't post it in a reply here though.) If it's a clean pulldown I can send you back an mkv with the pulldown removed.