[FFmpeg-user] Decimate question

[Paul B Mahol]

On Wed, Dec 30, 2020 at 6:44 PM Mark Filipak (ffmpeg) <markfilipak at bog.us>
wrote:

> On 12/30/2020 03:35 AM, Paul B Mahol wrote:
> > On Wed, Dec 30, 2020 at 6:08 AM Mark Filipak (ffmpeg) <
> markfilipak at bog.us>
> > wrote:
> >
> >> Decimate will drop a repeated frame in each sequence of 5 (=default)
> >> frames. I assume the dropped
> >> frame can be any 1 of the 5. Is there a way to discover which of the 5
> >> frames it dropped?
> >>
> >
> > -v debug
>
> May I make a feature request? Could it be added as ... is it called side
> data?
>
> I haven't used side data yet so I'm not quite sure what it is and how it's
> used.
>
> The frame # would need to be readable by follow-on logic inside
> expressions.
>
> This is for processing videos that have previously been telecined, a frame
> dropped, and a frame
> repeated, in various sequences. The sequence of the video destruction is
> not important. What's
> important is the phase of the decimation within the modulo-5 in the video
> that remains. In 4 of the
> 5 cases (phases), it's actually possible to almost completely recover the
> original video (prior to
> the wrecking). 4 out of 5 cases involve the loss of just 1 field in 10.
> The 5th case involves the
> total loss of a whole frame and is not recoverable (but since that case
> would have an amazing amount
> of judder, it's unlikely to be found in the wild). However, I have found
> other cases of this video
> species in the wild.
>

Sorry, but you make nonsense entries, very often and as expected.



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