[FFmpeg-trac] #8590(undetermined:closed): 'telecine=pattern' error for p24, soft telecined sources

[FFmpeg]

#8590: 'telecine=pattern' error for p24, soft telecined sources
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             Reporter:  markfilipak  |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by markfilipak):

 Replying to [comment:34 pdr0]:
 > Replying to [comment:32 markfilipak]:
 > > > > The reason I say it's twitter, not judder, is that if you do the
 calculations of average temporal location of the temporal center of the
 pictures and their durations, the cadence really is
 1/15s-1/15s-1/15s-1/15s.
 > > >
 > > > "twitter" is a reserved term for something else
 > >
 > > It is. It is? I've not found a definition for "twitter", though it's
 cited a lot. Got a link?
 >
 > "Twitter" is what kids use these days...joking :). It's a term that
 describes moire and aliasing artifacts in motion . The most common cause
 is interlace and deinterlacing artifacts from  low quality deinterlacing,
 but there are other causes.  If you click on the "show" on the wikipedia
 link, you can see simulated buzzing line "twitter" artifacts . I assumed
 you were looking at the correct file with blend deinterlacing. I wouldn't
 describe that as "twitter" . The combed version would be closer, but still
 not quite what you would call twitter
 > https://en.wikipedia.org/wiki/Interlaced_video#Interline_twitter

 I do some technical writing. I'd appreciate your opinion of the following

 "Twitter is when finely textured areas such as ventilation grates, brick
 walls, and textured paper appear to rapidly flash on-off-on-off or to
 flash changing colors. Twitter can make an actor's face appear to pulsate
 during close-ups. Twitter is actually a milder case of combing, but over
 an area. For uniformly patterned surfaces, twitter can produce moire."

 I'm not sure that twitter applies to faces appearing to pulsate.

 > I guess it comes down personal preference. I'm not a fan of the combed
 version either; to me it's the worst overall because the artifacts are too
 overpowering to ignore. Out of the 3, I prefer the original...

 Meaning: The 24fps video you made, right? That's a good source for testing
 aspects of transcoding animations, but I wonder how applicable it is to
 analog movies. 5-5-5-5 seems to work wonderfully for movies. This brings
 up a bushel basket of issues.

 You know, I pissed off some folks at ffmpeg-user because I don't accept
 expedient answers like, "It's a matter of personal taste." Does such an
 answer really inform?

 When digital TV was introduced, I was surprised that it was architected
 solely as the digital analog of analog TV, that digital TV didn't (and
 still doesn't) support random access. I naively expected that when a
 picture was sent to a digital TV it would remain on the screen awaiting
 changes -- with the addition of just 1 transistor, the pixels of flat
 panel TV screens can be memory cells. I'm confident that you're savvy
 enough to see how efficient that would be regarding streams & compression,
 and how beneficial it would be to free TV from frames and refresh rates. I
 mention this as out-of-the-box (or maybe off-planet) thinking. I
 understand how I can piss people off and I try to not overwhelm, but I
 often fail.

 You folks at ffmpeg are leaders in video. I'd like to contribute but have
 been frustrated.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8590#comment:35>
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