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• FFmpeg : animate image size to match music loudness

  22 juillet 2019, par skitzo

  This is for a script to generate Instagram video content. I have a script that merges an audio clip, video clip, and a logo centered throughout the whole output video’s duration.

  Goal : make the logo change size to match the audio waveform. The logo should look like it’s reacting to the beat.

  How can I achieve this using FFmpeg ? I don’t know if FFmpeg has this capability. Perhaps I could

  1. Use another library to get a volume array of the audio clip

  2. Generate an array of image sizes for the logo based on that volume array

  3. Read that array with FFmpeg ?

  1 and 2 are definitely possible but I don’t know how to approach step 3.

  Here’s the current command in my script that merges audio, video, logo, and crops the video into a square.

  ffmpeg -i video_path -i logo_path -i audio_path -filter_complex "[0:v]scale=-2:720,crop=500:500[bg];[bg][1:v] overlay=(W-w)/2:(H-h)/2" -      pix_fmt yuv420p -map 0:v -map 2:a -shortest out_path

• FFMPEG. Concatenate videos with a intro and music

  12 juillet 2019, par Micky

  I’m trying to merge videos with an intro and a background music.

  The intro.flv is a short file with video and audio.
  The other videos are without audio.
  ambientmusic.mp3 is audio to add to subsequent videos.
  A short fade for each file.

  ffmpeg -i intro.flv -i 0.mp4 -i 1.mp4 -i 2.mp4 -i ambientmusic.mp3 -filter_complex "[0] fade = in: 0: 25 [v0]; [1] fade = in: 0:25 [v1]; [2] fade = in: 0: 25 [v2]; [3] fade = in: 0: 25 [v3]; [v0] [v1] [v2] [v3] concat = 4 [v] "-map" [v] "-map a ./output/final.mp4

  Unfortunately the code only loads the first audio. Same result as

  -map 0: a

  If I use this instead it loads ambientmusic.mp3 on the whole video.

  -map 4: a

  But I’d like the audio of the Intro followed by the ambientmusic.mp3

  -map 0: a -map 4: a

• how to fade in and out background music when speech play and fade out audio at the end and mix them together using ffmpeg

  3 avril 2019, par Harshil Dholakiya

  I am using below command in my project to mix background music with my speech audio and background music slow down volume level when speech play :

  ffmpeg -y -i speech.mp3 -stream_loop -1 -i music.mp3 -filter_complex "[0:a]asplit=2[sc][mix];[1:a][sc]sidechaincompress=threshold=0.01:ratio=5[bg];[mix][bg]amix=inputs=2:duration=first:dropout_transition=0[final]" -map [final] finalAudio.mp3

  i want to add this two filter to audio :

  1) Fade-in effect to background music for 1.5 sec when speech arrive and fade-out effect when speech is finish for 1.5 sec. speech.mp3 has more than one speech and silence in between speech.

  2) Fade out effect at the end of audio for 1.5 sec.

  can anyone help me to achieve both of above filter using ffmpeg with my above command ?