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• avfilter/vf_curves : add PCHIP interpolator and interp option

  2 octobre 2022, par Takeshi (Kesh) Ikuma

  avfilter/vf_curves : add PCHIP interpolator and interp option
  summary : This patch modifies the `curves` filter with new `interp` option
  
           to let user pick the existing natural cubic spline interpolation
  
           and the new PCHIP interapolation.
  reason :  The natural cubic spline does not impose monotonicity between
  
           the keypoints. As such, the fitted curve may vary wildly against
  
           user's intension. The PCHIP interpolation is not as smooth as
  
           the natural spline but guarantees the monotonicity. Providing
  
           both options enhances users experience (e.g., reduces the number
  
           of keypoints to realize the desired curve). See the related bug
  
           report for the example of an ill-interpolated curve.
  alternate solution :
  
           Both Photoshop and GIMP appear to use monotonic interpolation in
  
           their curve tools, which were the models for this filter. As
  
           such, an alternate solution is to drop the natural spline and
  
           go without the `interp` option.
  related bug report : https://trac.ffmpeg.org/ticket/9947 (filed by myself)
  Signed-off-by : Takeshi (Kesh) Ikuma <tikuma@hotmail.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_curves.c

• Q : ffmpeg drawtext "localtime" video filter - display in custom format

  24 mars 2016, par Kārlis K.

  I’m having issues escaping ’ :’ symbol and displaying localtime in a hms(HH:MM:SS) format for overlay over a Live input(MPEG-TS) which is then pushed out as Live output - I’ve fumbled my way to displaying ’localtime’ in a format which achieves about half of what I’m trying to get to, the code sample of that is :

  ffmpeg -re -hide_banner -i LIVE_INPUT -vf drawtext="fontsize=90:fontcolor=white:fontfile=/Windows/Fonts/arial.ttf:text='%{localtime\:%H %M %S}'" -f LIVE_OUTPUT

  What it achieves is that it displays local time in a "HH MM SS" format instead of "HH:MM:SS"...

  ---

  I did try escaping ’ :’ by writing it like this :

  ffmpeg -re -hide_banner -i LIVE_INPUT -vf drawtext="fontsize=90:fontcolor=white:fontfile=/Windows/Fonts/arial.ttf:text='%{localtime\:%H\\:%M\\:%S}'" -f LIVE_OUTPUT

  and this :

  ffmpeg -re -hide_banner -i LIVE_INPUT -vf drawtext="fontsize=90:fontcolor=white:fontfile=/Windows/Fonts/arial.ttf:text='%{localtime\:%H\:%M\:%S}'" -f LIVE_OUTPUT

  as well as like this :

  ffmpeg -re -hide_banner -i LIVE_INPUT -vf drawtext="fontsize=90:fontcolor=white:fontfile=/Windows/Fonts/arial.ttf:text='%{localtime\:%H \: %M \: %S}'" -f LIVE_OUTPUT

  But none of the above helped as it returns different errors because ffmpeg tries to either parse ’%H’ ’%M’ and ’%S’ as multiple, separate arguments for localtime (localtime then complains that it can only accept x1 argument at most), or ffmpeg complains that there are loose ’%’ characters near "H" ... clearly I’m not escaping it correctly or my argument order is incorrect...

• Q : ffmpeg drawtext "localtime" video filter - display in custom format

  3 janvier 2023, par Kārlis K.

  I'm having issues escaping ' :' symbol and displaying localtime in a hms(HH:MM:SS) format for overlay over a Live input(MPEG-TS) which is then pushed out as Live output - I've fumbled my way to displaying 'localtime' in a format which achieves about half of what I'm trying to get to, the code sample of that is :

  



  ffmpeg -re -hide_banner -i LIVE_INPUT -vf drawtext="fontsize=90:fontcolor=white:fontfile=/Windows/Fonts/arial.ttf:text='%{localtime\:%H %M %S}'" -f LIVE_OUTPUT


  



  What it achieves is that it displays local time in a "HH MM SS" format instead of "HH:MM:SS"...

  



  ---

  



  I did try escaping ' :' by writing it like this :

  



  ffmpeg -re -hide_banner -i LIVE_INPUT -vf drawtext="fontsize=90:fontcolor=white:fontfile=/Windows/Fonts/arial.ttf:text='%{localtime\:%H\\:%M\\:%S}'" -f LIVE_OUTPUT


  



  and this :

  



  ffmpeg -re -hide_banner -i LIVE_INPUT -vf drawtext="fontsize=90:fontcolor=white:fontfile=/Windows/Fonts/arial.ttf:text='%{localtime\:%H\:%M\:%S}'" -f LIVE_OUTPUT


  



  as well as like this :

  



  ffmpeg -re -hide_banner -i LIVE_INPUT -vf drawtext="fontsize=90:fontcolor=white:fontfile=/Windows/Fonts/arial.ttf:text='%{localtime\:%H \: %M \: %S}'" -f LIVE_OUTPUT


  



  But none of the above helped as it returns different errors because ffmpeg tries to either parse '%H' '%M' and '%S' as multiple, separate arguments for localtime (localtime then complains that it can only accept x1 argument at most), or ffmpeg complains that there are loose '%' characters near "H" ... clearly I'm not escaping it correctly or my argument order is incorrect...