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• Mix voiceover and background music with delay and volume

  6 août 2019, par oldman

  I don’t master ffmpeg but I really need to mix a voiceover with a background song.

  The voiceover must start 5 seconds after the song, and must end 5 seconds before the song ends.

  The music volume must be loud for the first 5 seconds and the last 5 seconds, but during the voiceover it should remain low.

  Searching the internet, the closest I could come to my goal was this :

  ffmpeg -i music.mp3 -i voiceover.mp3 -filter_complex "[0]asplit[a][b]; [a]atrim=duration=5,volume='1-max(0.25*(t-13),0)':eval=frame[pre]; [b]atrim=start=5,asetpts=PTS-STARTPTS[song]; [song][1]amix=inputs=2:duration=shortest:dropout_transition=0[post]; [pre][post]concat=n=2:v=0:a=1[mixed]" -map " "[mixed]" output.mp3

  Could someone help me complete this script ?

• 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