[FFmpeg-user] bwdif filter question

[Paul B Mahol]

On Wed, Sep 23, 2020 at 04:26:27PM -0400, Mark Filipak (ffmpeg) wrote:
> On 09/23/2020 03:53 PM, Carl Eugen Hoyos wrote:
> > Am Di., 22. Sept. 2020 um 00:47 Uhr schrieb Mark Filipak (ffmpeg)
> > <markfilipak at bog.us>:
> > > 
> > > On 09/21/2020 06:07 PM, Carl Eugen Hoyos wrote:
> > > > Am Mo., 21. Sept. 2020 um 14:16 Uhr schrieb Mark Filipak (ffmpeg)
> > > > <markfilipak at bog.us>:
> > 
> > > > > Here is what you wrote:
> > > > > "The following makes little sense, it is just meant as an example:
> > > > > $ ffmpeg -f lavfi -i testsrc2,field -vf bwdif -f null -"
> > > > > 
> > > > > That "explains" nothing. Worse, it seems crass and sarcastic.
> > > > 
> > > > No.
> > > > This was an example to show you how you can feed one field to
> > > > a filter in our system, this is what you had asked for ...
> > > 
> > > I didn't ask for that.
> > 
> > This is not true:
> > > How can a frame contain just one field?
> 
> I did not ask for an example to see "how you can feed one field to a
> filter". I asked how a frame can contain just one field. You have yet to
> answer that. I think it's impossible. You may be referring to a frame that
> is deinterlaced and cut in half (e.g. from 720x576 to 720x288), in which
> case the frame contains no field.
> 
> You wrote: "(If you provide only one field, no FFmpeg deinterlacer will
> produce useful output.)". Of course I agree with the "no...useful output"
> part, however, how can a person "provide only one field"? That implies that
> "provide only one field" is an option. I think that's impossible, so I asked
> you how it was possible. I did not ask how to implement that impossibility
> on the command line (which I think is likewise impossible). It is along
> these lines that misunderstanding and confusion and novice angst ensues.
> 
> Am I nitpicking? I think not. You are an authority. When an authority uses
> loose language, misunderstanding and confusion and angst must follow. But
> MPEG and ffmpeg seems to be primed to require loose language. That needs to
> end.

Try to read and follow separatefields, weave and doubleweave filters documentation.

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