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• lavfi/drawutils : improve colorspace support

  2 juin 2022, par rcombs

  lavfi/drawutils : improve colorspace support
   Introduce ff_draw_init2, which takes explicit colorspace and range
  
    args
  
   Use lavu/csp and lavfi/colorspace for conversion, rather than the
  
    lavu/colorspace.h macros
  
   Use the passed-in colorspace when performing RGB->YUV conversions
  The upshot of this is :
  
   Support for YUV spaces other than BT601
  
   Better rounding for all conversions
  
   Particular rounding improvements in >8-bit formats, which previously
  
    used simple left-shifts
  
   Support for limited-range RGB
  
   Support for full-range YUV in non-J pixfmts
  Due to the rounding improvements, this results in a large number of
  
  minor changes to FATE tests.
  Signed-off-by : rcombs <rcombs@rcombs.me>
  

  • [DH] libavfilter/drawutils.c
  • [DH] libavfilter/drawutils.h
  • [DH] tests/ref/fate/filter-chromashift-smear
  • [DH] tests/ref/fate/filter-chromashift-wrap
  • [DH] tests/ref/fate/filter-decimate
  • [DH] tests/ref/fate/filter-fps-down
  • [DH] tests/ref/fate/filter-fps-down-eof-pass
  • [DH] tests/ref/fate/filter-fps-down-round-down
  • [DH] tests/ref/fate/filter-fps-down-round-up
  • [DH] tests/ref/fate/filter-fps-start-drop
  • [DH] tests/ref/fate/filter-fps-start-fill
  • [DH] tests/ref/fate/filter-fps-up
  • [DH] tests/ref/fate/filter-fps-up-round-down
  • [DH] tests/ref/fate/filter-fps-up-round-up
  • [DH] tests/ref/fate/filter-framerate-12bit-down
  • [DH] tests/ref/fate/filter-framerate-12bit-up
  • [DH] tests/ref/fate/filter-framerate-down
  • [DH] tests/ref/fate/filter-framerate-up
  • [DH] tests/ref/fate/filter-metadata-signalstats-yuv420p10
  • [DH] tests/ref/fate/filter-minterpolate-down
  • [DH] tests/ref/fate/filter-minterpolate-up
  • [DH] tests/ref/fate/filter-mpdecimate
  • [DH] tests/ref/fate/filter-overlay_yuv420p10
  • [DH] tests/ref/fate/filter-overlay_yuv422p10
  • [DH] tests/ref/fate/filter-pixfmts-pad
  • [DH] tests/ref/fate/filter-pixfmts-tinterlace_pad
  • [DH] tests/ref/fate/filter-testsrc2-yuv420p
  • [DH] tests/ref/fate/filter-testsrc2-yuv444p
  • [DH] tests/ref/fate/filter-tpad-add
  • [DH] tests/ref/fate/filter-tpad-clone
  • [DH] tests/ref/fate/filter-unsharp-yuv420p10
  • [DH] tests/ref/fate/filter-untile

• MLT How to Mix several audio tracks to play simultaneously ?

  24 septembre 2017, par user2455079

  I need to make video from list of video files, only some of them has sound and for some videos i need to add external soundtrack and for ALL videos and also I need to add global music that fill fade out to low volume on some videos.

  melt
  
  1.mp4" -mix 7 -mixer luma
  
  "2 mute.mp4" -mix 7 -mixer luma  
  
  "4.mp4" -mix 7 -mixer luma 
  
  -audio-track "music.mp3" out=600 -transition mix in=0 out=600 a_track=0 b_track=1  -filter volume level="0=0;68=0;83=-21;160=-21;170=0;470=0;481=-21;500=-21;510=0"
  
  -audio-track -blank 481 "voiceover.mp3" -transition mix in=481  a_track=0 b_track=1 

  Everything works fine except when adding soundtrack to specified position (last string) it overwrites music.mp3 (previous string) so music is muted.
  Everything needs to be mixed...

  How to add several sound tracks so they will play simultaneously ?

• How to slide mutiple images left continuously ?

  2 mai 2024, par mikezang

  I use ffmpeg to slide images from left to center as below :

  


  #slide 1st image from right to center
#countdown 10 seconds
#slide 1st image from center to left and in the same time
#slide 2nd image from right to center
#countdown 10 seconds
#...

ffmpeg -loglevel quiet -loop 1 -i input.png -filter_complex "split=2[bg][slider];[bg]drawbox=c=black:t=fill[bg];[bg][slider]overlay=x='max(W-w*t,0)':y=0" -t 10 -y output.mp4


  


  There is black background between two images, I want to the preious page keep slide from center to left and next page slide fron right to center, what can I do ?