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Post #586212

Author
AntcuFaalb
Parent topic
Film->VHS Question
Link to post in topic
https://originaltrilogy.com/post/id/586212/action/topic#586212
Date created
19-Jul-2012, 4:09 PM

In Film->NTSC_VHS conversions, is the film telecined (to get 29.970fps) and then interlaced? If so, would you deinterlace before or after IVTC'ing?

Wikipedia seems to indicate that all VHSs are interlaced, by design:

Each helical track contains a single field ('even' or 'odd' field, equivalent to half a frame) encoded as an analog raster scan, similar to analog TV broadcasts. The horizontal resolution is 170 lines per scanline, and the vertical resolution (the number of scanlines) is the same as the respective analog TV standard (576 for PAL or 486 for NTSC). In modern-day digital terminology, NTSC VHS is roughly equivalent to 333x480 pixels luma and 40x480 chroma resolutions (333x480 pixels=159,840 pixels or 0.16MP (1/6 of a MegaPixel)).[18], while PAL VHS offers the equivalent of about 335x576 pixels luma and 40x240 chroma (the vertical chroma resolution of PAL is limited by the PAL color delay line mechanism).