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• Concatenating multiple videos using opencv

  6 mai 2022, par Anshula

  I am concatenating videos using OpenCV by passing the videos in a list and then concatenating the frames of the videos traversing them frame by frame. But in doing so the audio in the final output video is not present. So, is there a way such that audio is also preserved after concatenation. Other than this I have tried concating using ffmpeg but it is giving non-monotonous DTS error and the output video is much larger(like if a video after concat should be of duration 1hr the actual output video is of 8 hrs).

  


• 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.

• ffmpeg - Merge two audios with different duration

  5 juin 2015, par Andrés

  Is it possible to merge two audio files with different duration (I don’t know which one is the longest) using ffmpeg’s amerge filter ?

  I don’t want to have a final audio only with the shortest duration, I need that the longest audio be complete too.

  I don’t want to use amix, it’s decreasing the volume of the audios.