On 12/30/2020 03:35 AM, Paul B Mahol wrote:
On Wed, Dec 30, 2020 at 6:08 AM Mark Filipak (ffmpeg) <[email protected]>
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.
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