Am 21.04.2020 um 11:07 schrieb Paul B Mahol:
On 4/21/20, Michael Koch <astroelectro...@t-online.de> wrote:
I now appreciate that 'blend' has a "preferred" input similar to
'overlay',
but that behavior is not
documented. In the case of 'overlay', the name "main" doesn't convey that
meaning, and in the case
of 'blend', that behavior is not documented at all. Both documentations
should explain how
timestamps control output and that the 1st filter-input's timestamp
determines the filter-output's
timestamp.
Blend filter does not have preferred input since long time.
If the blend filter gets two input frames with different timestamps,
then what's the timestamp of the output frame?
I can think ot at least 5 possible scenarios:
-- timestamp is copied from the first input
-- copied from the second input
-- the smaller of the two timestamps
-- the larger of the two timestams
-- the artihmetic mean of the two timestamps
It is discouraged to use blend in such case.
How would you solve the problem?
Given is a sequence of frames 1, 2, 3, 4, ...
Wanted is a sequence 1, 1, 1+2, 2, 2, 3, 3, 3+4, 4, 4, ...
where "+" stands for a mix of two frames.
Michael
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