[FFmpeg-trac] #4837(undetermined:closed): itsoffset has no effect for png stream and overlay/blend filter

[FFmpeg]

#4837: itsoffset has no effect for png stream and overlay/blend filter
-------------------------------------+-------------------------------------
             Reporter:  d-fens_      |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:  invalid
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Changes (by michael):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 itsoffset is the wrong tool for this, much more flexible is to
 conditionally enable the filter as in:

 {{{
 ./ffmpeg -r 15 -loop 1  -i background.png -r 15 -loop 1   -i overlay.png
 -filter_complex "[1] [0] blend=addition:enable='between(t,0,1)'" -y -t 10
 test.mp4
 }}}
 of something like this
 {{{
  -filter_complex "[1] setpts=T+5[t],[0][t] blend=addition"
 }}}

 Feel free to reopen the ticket if you belive that theres a bug

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Ticket URL: <https://trac.ffmpeg.org/ticket/4837#comment:1>
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