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21st November 2018, 08:09 | #1 | Link |
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De-interlacing dropping single frame
I'm trying to frame match a few widescreen PAL DVD sources to their full frame NTSC DVD cousins, so I can get the proper audio with the proper picture. In some of my sources, I noticed the PAL source having an extra frame or two on scene changes when frame matching in AviSynth. I was using a simple "TFM().TDecimate()" on the NTSC source since they're 100% FILM per DGIndex, so instead I threw in "SeparateFields().SelectEven()" to investigate if it was really missing, and sure enough there's the missing frame in the NTSC source (doesn't show using "SeparateFields().SelectOdd()")
My question is, since I don't really care about the NTSC video being properly preserved, what's the best way to de-interlace it to best match its (NTSC) audio? Ie, would a normal set top DVD player ignore that frame as well during playback/would I want to keep it out of my PAL frame-matched encode to best keep audio sync? Here's my current script I was using to frame match that was working until my trouble discs : Code:
#Sources #PAL source PAL=MPEG2Source("D:\Files to Edit\Source\PAL\S01E01\PALsource.d2v",cpu=0).Crop(2,4,-2,-4).z_Spline36Resize(960,540).AssumeFPS("ntsc_film") #NTSC DVD for frame matching NTSC=MPEG2Source("D:\Files to Edit\Source\NTSC\NTSCsource.d2v",cpu=0).TFM().TDecimate().z_Spline36Resize(768,576).AddBorders(128, 0, 128, 0, color=$000000).z_Spline36Resize(960,540) #Cuts Part01=PAL.Trim(39,20280) Part02=PAL.Trim(20284,37870) Part03=PAL.Trim(37892,53660) Part04=PAL.Trim(53671,67030) Part05=PAL.Trim(67073,74560) Part06=PAL.Trim(74566,91300) Part07=PAL.Trim(91314,105310) Part08=PAL.Trim(105331,124515) #Merge cuts Film=Part01+Part02+Part03+Part04+Part05+Part06+Part07+Part08 #Uncomment for DVD frame matching / comment for final cut #StackVertical(Film,NTSC) #Interleave(Film,NTSC) #Uncomment for final cut / comment for DVD frame matching Film Last edited by dcxero; 21st November 2018 at 08:15. |
21st November 2018, 21:35 | #2 | Link | ||
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Quote:
Quote:
If I'm understanding correctly, you're slowing the PAL source to film speed and hoping to match the NTSC audio with it? And the NTSC audio is longer than is the slowed PAL video? Or shorter? And by about how much by the end? Have you considered stretching the audio to match the video length? |
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22nd November 2018, 00:41 | #3 | Link | |
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Using the picture above as an example, what if the original frame B was the last frame of a scene? SeparateFields().SelectOdd() applied to frame #3 of the telecined version would show you a field from the "current" scene, while SeparateFields().SelectEven() would show you a field from the next scene. I'm wondering if that's partly the sort of thing you're seeing. I assume the extra PAL frames on scene changes are in addition to the frames you've already skipped in your posted script? I'm sure I've seen that sort of thing several times before, and even when comparing progressive 25fps and 23.976fps HD versions. I don't know why, but the last time I combined 25fps video with 23.976fps audio I found the 25fps video often had one less frame at the end of scenes, and they were both 1080p. If decoding with Force Film as manono suggested doesn't make a difference, all you can do is drop or repeat a frame at the beginning or end of scenes as required. If the scene changes are lined up that way it should be close enough. Last edited by hello_hello; 22nd November 2018 at 11:28. |
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