Mark Filipak wrote > Deinterlacing is conversion of the i30-telecast (or i25-telecast) to p30 > (or p25) and, optionally, > smoothing the resulting p30 (or p25) frames.
That is the description for single rate deinterlacing. But that is not what a flat panel TV does with interlaced content or "telecast" - it double rate deinterlaces to 50p (50Hz regions) or 59.94p (60Hz regions). The distinction is important to mention; one method discards half the temporal information and motion is not as smooth. Deinterlacing does not necessarily have to be used in the context of "telecast". e.g. a consumer camcorder recording home video interlaced content is technically not "telecast". Telecast implies "broadcast on television" The simplest operational definition is double rate deinterlacing separates and resizes each field to a frame +/- other processing. Single rate deinterlacing does the same as double, but discards either even or odd frames (or fields if they are discarded before the resize) > Combing is fields that are temporally offset by 1/24th second (or 1/25th > second) resulting from > telecine up-conversion of p24 to p30 (or p25). I know you meant telecine up conversion of 23.976p to 29.97i (not "p"). But other framerates can be telecined eg. An 8mm 16fps telecine to 29.97i. "Combing" is just a generic, non-specific visual description. There can be other causes for "combing". eg. A warped film scan that causes spatial field misalignment can look like "combing". Interlaced content in motion , when viewed on a progressive display without processing is also described as "combing" - it's the same underlying mechanism of upper and lower field taken at different points in time > Decombing is smoothing combed frames. Yes, but this is an ambiguous term. "Decombing" can imply anything from various methods of deinterlacing to inverse telecine / removing pulldown . > It seems to me that some people call combing that results from telecine, > interlace. Though they are > superficially similar, they're different. Yes, it's more appropriately called "combing". When writing your book , I suggest mentioning field matching and decimation ( inverse telecine, removing pulldown) in contrast to deinterlacing. I recommend describing the content. That's the key distinguishing factor that determines what you have in terms of interlaced content vs. progressive content that has been telecined -- Sent from: http://www.ffmpeg-archive.org/ _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
