[FFmpeg-devel] [PATCH] lavfi/mp: remove mp=dint

Stefano Sabatini stefasab at gmail.com
Thu Sep 5 16:52:49 CEST 2013

On date Wednesday 2013-09-04 21:19:33 +0200, Reimar Döffinger encoded:
> On Wed, Sep 04, 2013 at 11:50:47AM +0000, Paul B Mahol wrote:
> > Signed-off-by: Paul B Mahol <onemda at gmail.com>
> > ---
> > 
> > I can't comprehend its documentation.
> > Code is extremly unreadable so I can't bother what it actually does.
> > There is better filter that can detect interlaced (among others) frames.
> > There is better filter that can drop any (including interlaced) frames.

> What it does is quite simple: It detects frames that look (still)
> interlaced and tries to drop them.
> I expect is intended to be used with incorrectly inverse telecined content
> to get rid of any bad-looking frames.
> Due to this, it will never drop more than one frame in a row, since
> that would look bad and is likely to mean that the interlace detection
> didn't work right.
> I don't know if the two filters you mentioned can achieve this
> behaviour together, though I would guess it should not be hard to
> implement if they do not.

Theoretically, you could combine idet and select. Practically this
requires at least two steps, mark interlaced frames as such through
metadata, and allow the select filter to access metadata
(e.g. select=if(metadata(lavfi.idet.interlaced))).

As alternative, scripting would allow that easily with user-provided
filtering logic.

I also wonder how the idet detection code compares with the one in
dint (we should probably factorize and pick the best one).
FFmpeg = Fascinating Fierce Maxi Peaceful Enigmatic Glue

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