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• 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.

  


• improve the performance of making slide video using ffmpeg

  1er juin 2018, par huynq9

  I have 10 images(1080x1920) and 2 video(1080x1920).
  I want to merge all of them to make a final video using command :

  INPUT_DATA=(_img1.jpg vid1.mp4 _img2.jpg vid2.mp4 _img3.jpg _img4.jpg _img5.jpg _img6.jpg _img7.jpg _img8.jpg _img9.jpg _img10.jpg)
  
  IMAGE_TIME_SPAN=5
  
  INPUT_DIR="input"
  
  OUTPUT_DIR="output"
  
  BACKGROUND_MUSIC="$INPUT_DIR/background.mp3"
  
  OUTPUT_STEP1="$OUTPUT_DIR/tmp_video.mp4"
  
  OUTPUT_STEP3="$OUTPUT_DIR/tmp_background.mp3"
  
  OUTPUT_FILE="$OUTPUT_DIR/final.mp4"
  
  SCALE_SIZE="1080x1920"
  
  
  
  ffmpeg -y \
  
      -f lavfi -t 1 -i anullsrc \
  
      -i $INPUT_DIR/${INPUT_DATA[0]} \
  
      -i $INPUT_DIR/${INPUT_DATA[1]} \
  
      -i $INPUT_DIR/${INPUT_DATA[2]} \
  
      -i $INPUT_DIR/${INPUT_DATA[3]} \
  
      -i $INPUT_DIR/${INPUT_DATA[4]} \
  
      -i $INPUT_DIR/${INPUT_DATA[5]} \
  
      -i $INPUT_DIR/${INPUT_DATA[6]} \
  
      -i $INPUT_DIR/${INPUT_DATA[7]} \
  
      -i $INPUT_DIR/${INPUT_DATA[8]} \
  
      -i $INPUT_DIR/${INPUT_DATA[9]} \
  
      -i $INPUT_DIR/${INPUT_DATA[10]} \
  
      -i $INPUT_DIR/${INPUT_DATA[11]} \
  
      -filter_complex \
  
      "[1:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img1]; \
  
       [2:v]fade=t=in:st=0:d=4:alpha=1,scale=$SCALE_SIZE[v1]; \
  
       [3:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img2]; \
  
       [4:v]fade=t=in:st=0:d=4:alpha=1,scale=$SCALE_SIZE[v2]; \
  
       [5:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img3]; \
  
       [6:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img4]; \
  
       [7:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img5]; \
  
       [8:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img6]; \
  
       [9:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img7]; \
  
       [10:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img8]; \
  
       [11:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img9]; \
  
       [12:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img10]; \
  
       [img1][0:a][v1][0:a][img2][0:a][v2][0:a][img3][0:a][img4][0:a][img5][0:a][img6][0:a][img7][0:a][img8][0:a][img9][0:a][img10][0:a]concat=n=12:v=1:a=1" \
  
      -pix_fmt yuv420p -c:v libx264 \
  
      $OUTPUT_STEP1

  I run this command on a virtual machine (Linux, 4GB memories) and it takes 11 min to finish ! It takes too long and I want to reduce the process time to less than 5 min.

  Any suggestion for the better performance.