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• avcodec/evc_frame_merge_bsf : make ff_evc_parse_nal_unit() local to the filter

  17 juin 2023, par James Almer

  avcodec/evc_frame_merge_bsf : make ff_evc_parse_nal_unit() local to the filter
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/evc_frame_merge_bsf.c

• avcodec/aacdec_lpd : remove unused local variables

  21 juin 2024, par Leo Izen

  avcodec/aacdec_lpd : remove unused local variables
  int idx, and int first_tcx_flag are set but not used, so this commit
  
  removes their declarations and assignments.
  

  • [DH] libavcodec/aac/aacdec_lpd.c

• ffmpeg is overlying images when making movie from png files of an evolving chart

  15 octobre 2020, par James Carroll

  I am trying to make a movie of a series of charts as they change through time. I have 30 or so still versions of the chart in .png format.

  


  But when I combine them into a movie, the charts are progressively overlaid on top of each other, rather than progressing through time.

  


  I have tried several variations including :

  


  ffmpeg -r 1 -f image2 -start_number 0 -i name%2d.png -q:v 5 movie.wmv


  


  and

  


  ffmpeg -r 1/5 -start_number 1 -i name%2d.png -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4


  


  All do the same thing.

  


  Any idea why this is happening ?

  


  Update 1 :

  


  git repo of sample images and failed movie here : https://github.com/jlc42/MovieTest.git

  


  Update 2 :

  


  Just in case, I tried removing the alpha channel with the following command which I found in another thread Remove alpha channel in an image :

  


  for i in `ls *.png`; do convert $i -background black -alpha remove -alpha off $i; done


  


  because my background is white, I also tried :

  


  for i in `ls *.png`; do convert $i -background white -alpha remove -alpha off $i; done


  


  I THINK I have now successfully removed the alpha channel in the images, but this did not seem to make a difference for what ffmpeg is doing.