Hi everyone,
I changed a 29.97 source to 23.976 and then Decimated. The source is now longer than the same 29.97 source. Do I need to slow down audio to compensate? I remember reading how 23.976 audio is the same as 29.97 audio? But found that confusing as to how that's possible
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What? How did you change it? With an AssumeFPS? If so, bad move. When one talks about changing from 29.97fps to 23.976fps, they usually mean performing an IVTC.
If that's what you're trying to do for a DVD source you first make the D2V project file using 'Honor Pulldown Flags' as the Field Operation, followed by opening the video using MPEG2Source and then do the IVTC using something such as:
TFM().TDecimate()
The framerate changes from 29.97fps to 23.976fps, the length remains the same and the audio remains in synch. If your audio went out of synch you did something different.
As usual, if you're asking for help on what to do with a DVD source you have, cut a small piece using DGIndex and upload it here.
But found that confusing as to how that's possible -
It depends on how you did the frame rate conversion. The 23.976 fps video can have the exactly same running time as the 29.97 fps video, or it can run 25 percent longer, depending on how you did the conversion. Or if you totally screwed up it could be something entirely different.
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How does one decide between Resampling the FPS (which just increases/decreases frames while keeping duration fixed - similar to bob deinterlacers) versus DECIMATING to 23.976?
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Why did you change the fps in the first place?29.97 is better than 23.976 if both are progressive.
I think,therefore i am a hamster. -
Sorry manono! I meant I changed the 29.97 source to 23.976 THROUGH decimation.
Source does not show 3:2 pulldown but a rather odd pattern...1 interlaced frames and 4 uninterlaced frames. -
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It's a tape capture ? How did it become 59. 9 frames per second ?
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Is this your capture? What device and software did you use ?
Is the file you provided the actual capture file? Or some conversion ? -
Here is the raw file...as you all can see it is 29.97. Not sure why it becomes 60p using mkvmerge
http://www.mediafire.com/download/ok563h5heka058k/rawfile.m2ts -
I'm not sure why the frame rate is changed, perhaps somebody who knows more about the file type can explain.
you can access the original m2ts using FFmpegsource in Avisynth, or even directshowsource .
Once you get the proper frame rate you can use tfm().tdecimate() -
The reason it see's it as 59.95 fps is cause it's interlaced,best to leave it as is rather than butchering it.
I think,therefore i am a hamster. -
So it's just a pure interlaced source. I really rather butcher it. Any idea what fps to put it to?
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It's not a pure interlaced source. It was once film. But your capture is so poor the usual ivtc methods don't work right.
Code:LWLibavVideoSource("rawfile.m2ts") TFM(cthresh=15) # field match TDecimate() # restore original 23.976 fps Vinverse() # reduce residual combing from poor horizontal time base
Last edited by jagabo; 14th Jul 2016 at 16:23.
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How can you tell if its film? Most things are film aren't they? At least for cartoon drawn at 8fps and made into film ...
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This appears to work adequately for this clip:
Code:LWLibavVideoSource("rawfile.m2ts") TFM(field=0, pp=0) TFM(field=1, pp=0) # maybe another TFM() here without pp=0 to deinterlace any orphaned fields vInverse() TDecimate()
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