Hello guest, if you like this forum, why don't you register? https://fanrestore.com/member.php?action=register (December 14, 2021) x


Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
NTSC Laserdisc with PAL speedup
#1
So I have an NTSC film laserdisc (29.97) that seems to have been made from a sped up PAL master, and I'm wondering what my options are. The laserdisc is about 5 minutes shorter than it should be (1h40 instead of 1h45), and the audio is also higher pitch than normal. Right now I'm just using:

disc = AVISource("E:\movie.avi")
\.ConvertToYV12()
\.TFM()
\.TDecimate()
\.Levels(16, 1, 255, 0, 255, coring=false)
\.Crop(8,2,-6,-2)
\.Spline36Resize(640, 480)


This of course just gives me NTSC film framerate, but everything is the same length and speed as before. Perhaps AssumeFPS could work to slow it down before applying decimation?
Reply
Thanks given by:
#2
You could use Audacity to fix the audio.

I believe you can change speed and pitch.
Reply
Thanks given by:
#3
(2022-12-22, 06:48 PM)wongfeihung Wrote: You could use Audacity to fix the audio.

I believe you can change speed and pitch.

Yup, Audacity works well and gives you the ability to change it perfectly as PAL speedup can vary a bit. I've never really done any audio stuff in avisynth.
Reply
Thanks given by:
#4
(2022-12-22, 05:58 PM)bronan Wrote: So I have an NTSC film laserdisc (29.97) that seems to have been made from a sped up PAL master, and I'm wondering what my options are. The laserdisc is about 5 minutes shorter than it should be (1h40 instead of 1h45), and the audio is also higher pitch than normal. Right now I'm just using:

disc = AVISource("E:\movie.avi")
\.ConvertToYV12()
\.TFM()
\.TDecimate()
\.Levels(16, 1, 255, 0, 255, coring=false)
\.Crop(8,2,-6,-2)
\.Spline36Resize(640, 480)


This of course just gives me NTSC film framerate, but everything is the same length and speed as before. Perhaps AssumeFPS could work to slow it down before applying decimation?

Are you getting the usual frame repeat pattern you'd expect for an NTSC laserdisc? I know @PDB was working on some NTSC DVDs that were sourced from botched PAL masters and it wasn't as easy as applying TFM/TDecimate. I'm sure he'll give you a better explanation than me but the frame pattern was all over the place and don't think he ever got a resolution.

The videohelp forum has a few users who are very experienced in Avisynth so if you posted a 10 second clip they might be able to help with a custom script.
Reply
Thanks given by:
#5
(2022-12-23, 12:40 AM)alleycat Wrote: Are you getting the usual frame repeat pattern you'd expect for an NTSC laserdisc? I know @PDB was working on some NTSC DVDs that were sourced from botched PAL masters and it wasn't as easy as applying TFM/TDecimate. I'm sure he'll give you a better explanation than me but the frame pattern was all over the place and don't think he ever got a resolution.

The videohelp forum has a few users who are very experienced in Avisynth so if you posted a 10 second clip they might be able to help with a custom script.

I'm going to look at the pattern closer as soon as my break starts, was just hoping there was a canned solution for this Smile And yea, I am afraid the worst case might be that its unrecoverable..
Reply
Thanks given by: alleycat
#6
The only LD I have come across like this was my JP release of Nightbreed, it was PAL speed but interlaced as NTSC with blended fields, so IVTC didn't work. In the end I did a basic deinterlace.
Years ago there was an avisynth script for deblending, I think it was called srestore? I could never get it to work on my system as there were too many additional filters needed, which would throw all sorts of errors.
Reply
Thanks given by: bronan , alleycat
#7
(2022-12-23, 06:50 PM)zoidberg Wrote: The only LD I have come across like this was my JP release of Nightbreed, it was PAL speed but interlaced as NTSC with blended fields, so IVTC didn't work. In the end I did a basic deinterlace.

I ran into this last year when I was working on prepping and then AI upscaling the BMW films. The first series was only released on a non-anamorphic DVD with some crazy interlacing. I'm guessing it was edited after it was telecinced so lots of blended fields and orphans. TFM was also constantly flagging certain frames/scenes as interlaced when it shouldn't have so this seemed like the best solution for me to keep as much of the original detail as possible.

I didn't like the results from QTGMC so I stuck with TFM and built an ovr file for each film. The override file let me choose specific frames or ranges of frames to be flagged as combed, or set as a different type of post-processing.

QTGMC has been the best option for some of my sources though, especially ones that are lower bitrate and/or really noisy.
Reply
Thanks given by: bronan
#8
That sounds like time compression which was sadly ultra common on US discs in the earlier days of the format. It lasted through the late 80’s and affects even some big name titles. Some got stuck this way even on reissues for a while.
Damn Fool Idealistic Crusader
Reply
Thanks given by: dvdmike
#9
Yeah the first PAL release of star wars I have has time compression
Reply
Thanks given by:


Possibly Related Threads…
Thread Author Replies Views Last Post
  PAL to NTSC alexpeden2000 13 11,116 2015-11-07, 04:33 PM
Last Post: Jetrell Fo

Forum Jump:


Users browsing this thread: 1 Guest(s)