[FFmpeg-trac] #8459(avfilter:open): V360 + BLEND

[FFmpeg]

#8459: V360 + BLEND
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             Reporter:  villmer      |                    Owner:  villmer
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  v360         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by mkoch):

 I did download the video in size 1280x640. The first command line makes
 only the conversion from dual_fisheye to equirectangular, without
 smoothing. The best in_pad parameter must be found by try and error. That
 should be always the same value, as long as you use the same camera.
 The second command line does the same thing, but including smoothing.
 Unfortunately all these workarounds with geq filter are quite slow. That's
 why I limited the duration to 8 seconds.

 set "FF=c:\ffmpeg\ffmpeg"  :: Path to FFmpeg
 set "IN=dualfisheye.mp4"   :: Input video
 set "B1=320"               :: Left side of first vertical border, right
 side is at B1+1
 set "B2=959"               :: Left side of second vertical border, right
 side is at B2+1
 set "W=25"                 :: Width of interpolation area
 set "T=8"                  :: Duration in seconds

 %FF% -i %IN% -vf "v360=input=dfisheye:output=e:in_pad=0.058" -t %T% -y
 out1.mp4

 %FF% -i %IN% -vf
 "v360=input=dfisheye:output=e:in_pad=0.058,geq=cb_expr='cb(X,Y)':cr_expr='cr(X,Y)':lum_expr='clip(lum(X,Y)+between(X,%B1%-%W%,%B1%)*lerp(0,lum(%B1%+1,Y)-lum(%B1%,Y),(X-%B1%+%W%)/%W%)+between(X,%B2%-%W%,%B2%)*lerp(0,lum(%B2%+1,Y)-lum(%B2%,Y),(X-%B2%+%W%)/%W%),0,255)'"
 -t %T% -y out2.mp4

 pause

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Ticket URL: <https://trac.ffmpeg.org/ticket/8459#comment:18>
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