[FFmpeg-user] Documentation for Ffmpeg remap filter

[Evert Vorster]

Thanks, Paul.
I'll give it a test.

On 6 August 2017 at 21:26, Paul B Mahol <onemda at gmail.com> wrote:

> On 8/6/17, Evert Vorster <evorster at gmail.com> wrote:
> > Hi there.
> >
> > I have been able to use ffmpeg to convert dual fisheye samsung gear 360
> > footage to equirectangular footage with ffmpeg.
> >
> > The example program given in the manual does an OK job of what the remap
> > filter is capable of, however to really get the best from it the .pgm
> maps
> > needs to be created with something that takes lens chataristics into
> > account.
> >
> > Passing the -c parameter to Panotool's nona generates the required
> > translation maps in .tif format, and then it's a doddle to convert to
> .pgm
> > with ImageMagick.
>
> FFmpeg can read tif format just fine last time I checked.
>
> >
> > Is there a way to update the manual a little for other people who wants
> to
> > folow in my footsteps?
> >
> > For the curious, here is the contents of the script that I use.
> > ------------------------------------------------------------
> --------------------------
> > #!/bin/bash
> > #This will split, defish, blend and re-assemble Samsung Gear 360 video
> > map_dir="/data/Projects/RemapFilter"
> > ffmpeg -y -i "$1" \
> > -i $map_dir/lx.pgm -i $map_dir/ly.pgm -loop 1 \
> > -i $map_dir/Alpha-Map.png \
> > -i $map_dir/rx.pgm -i $map_dir/ry.pgm \
> > -c:v hevc_nvenc -rc constqp -qp 26 -cq 26 \
> > -filter_complex \
> > "[0:v]eq=contrast=0.8:brightness=-0.01:gamma=0.7:saturation=0.8[bright];
> \
> >  [bright]split=2[in1][in2]; \
> >  [in1]crop=in_w/2:in_h:0:in_h[l_crop];\
> >  [in2]crop=in_w/2:in_h:in_w/2:in_h[r_crop]; \
> >  [3]alphaextract[alf]; \
> >  [l_crop]vignette=angle=PI/4.6:mode=backward[l_vignette]; \
> >  [l_vignette][1][2]remap[l_remap]; \
> >  [r_crop]vignette=angle=PI/4.8:mode=backward[r_vignette]; \
> >  [r_vignette][4][5]remap[r_remap]; \
> >  [l_remap]crop=in_w:1920:0:(in_h-1920)/2[l_rm_crop]; \
> >  [r_remap]crop=in_w:1920:0:(in_h-1920)/2[r_rm_crop]; \
> >  [l_rm_crop][alf]alphamerge[l_rm_crop_a]; \
> >  [l_rm_crop_a]split=2[l_rm_crop1][l_rm_crop2]; \
> >  [l_rm_crop1]crop=in_w/2:in_h:0:0[l_rm_crop_l]; \
> >  [l_rm_crop2]crop=in_w/2:in_h:in_w/2:0[l_rm_crop_r]; \
> >  [0:v][r_rm_crop]overlay=(1920-(2028/2)):0[ov1]; \
> >  [ov1][l_rm_crop_l]overlay=((1920+2028/2)-(2028-1920)):0[ov2]; \
> >  [ov2][l_rm_crop_r]overlay=0:0[out]" \
> > -map [out] -map 0:a "$1_Remapped.mp4"
> > ------------------------------------------------------------
> --------------------------------
> > I hope this helps somebody.
> >
> > Kind regards
> > --
> > Evert Vorster
> > Isometrix Acquistion Superchief
> > _______________________________________________
> > ffmpeg-user mailing list
> > ffmpeg-user at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >
> > To unsubscribe, visit link above, or email
> > ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".




-- 
Evert Vorster
Isometrix Acquistion Superchief