ffmpeg commands

ffmpeg.sh

# Adding blurred boxes
# - build a layer called b0, a blurred box with size 100x50 and offset 600x50, between 23s and 31s
# - build a layer called b1, a blurred box with size 300x80 and offset 190x270, between 37s and 49s
# - merge the original video and b0 on ovr0
# - merge ovr0 and b1 to build output
ffmpeg -i input.mp4  -filter_complex \
    "[0:v]crop=100:50:600:150,boxblur=10:enable='between(t,23,31)'[b0]; \
    [0:v]crop=300:80:190:270,boxblur=10:enable='between(t,37,49)'[b1]; \
    [0:v][b0]overlay=600:150[ovr0]; \
    [ovr0][b1]overlay=190:270[output]" \
    -map "[output]" -map 0:a -c:v libx264 -c:a copy -movflags +faststart output.mp4

# Slicing a part of a video
# https://stackoverflow.com/questions/30444768/ffmpeg-cut-first-5-seconds
# https://stackoverflow.com/questions/18444194/cutting-the-videos-based-on-start-and-end-time-using-ffmpeg
# - builds a video starting at 0:10:00.123, with duration 00:00:45.466 
ffmpeg -ss 0:10:00.123 -i input.mp4 -t 00:00:45.466 -c copy output.mp4
# - builds a video starting at 0:01:00 and ending at 00:02:00
ffmpeg -ss 0:00:01 -to 00:02:00 -i input.mp4 -c copy output.mp4

# Extracting an image from a specific timeframe
ffmpeg -i input.mp4 -ss 00:00:07.000 -vframes 1 output.jpg

# References
# http://shelleyness.com/questions/814/ffmpeg-aplique-desfoque-no-rosto
# https://medium.com/abraia/basic-video-editing-for-social-media-with-ffmpeg-commands-1e873801659
# http://ffmpeg.org/ffmpeg-filters.html#boxblur
# https://www.bugcodemaster.com/article/extract-images-frame-frame-video-file-using-ffmpeg
# https://gist.github.com/eyecatchup/51ebf27478889a42e07c2baeedebb76b



# Audio filtering
# afftdn filter - https://ffmpeg.org/ffmpeg-filters.html#afftdn
# https://superuser.com/questions/733061/reduce-background-noise-and-optimize-the-speech-from-an-audio-clip-using-ffmpeg
ffmpeg -i original.mp4 -af "afftdn=nf=-25:nr=97:tn=1" output.mp4

# highpass && lowpass
ffplay original.mp4 -af lowpass=2000,highpass=200
ffmpeg -i original.mp4 -af lowpass=2000,highpass=200 output.mp4


# Extract audio from video
# https://stackoverflow.com/a/36324719/823533
ffmpeg -i sample.avi -ss 00:03:05 -t 00:00:45.0 -q:a 0 -map a sample.mp3


# Join audio slices
# https://superuser.com/a/1631198
ffmpeg -i "concat:p1.mp3|p2.mp3|p3.mp3" -acodec copy output.mp3

# Concat video files
# https://stackoverflow.com/a/11175851/823533
cat mylist.txt
file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'
    
ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

# concat reencoding
# http://www.ffmpeg.org/faq.html#Concatenating-using-the-concat-demuxer
ffmpeg -i input1.avi -qscale:v 1 intermediate1.mpg
ffmpeg -i input2.avi -qscale:v 1 intermediate2.mpg
ffmpeg -i concat:"intermediate1.mpg|intermediate2.mpg" -c copy intermediate_all.mpg
ffmpeg -i intermediate_all.mpg -qscale:v 2 output.avi

# other solution
# https://stackoverflow.com/a/67840993/823533
ffmpeg -i jpn_op.m4a -i eng_nop.m4a -filter_complex "[0:a][1:a]concat=n=2:v=0:a=1" final.mp4



# Flip video
ffmpeg \
    -i input_file \
    -filter:v "hflip, vflip" \
    -c:a copy \
    output_file



# Add 5s delay to audio track
# https://gist.github.com/adrienjoly/e5b2db9c9a61f454ed08f56c32999f17
ffmpeg -i input.mp4 -itsoffset 5 -i input.mp4 -map 0:v -map 1:a -vcodec copy -acodec copy delayed.mp4



# Scale
# https://ottverse.com/change-resolution-resize-scale-video-using-ffmpeg/
# https://www.bannerbear.com/blog/how-to-crop-resize-a-video-using-ffmpeg/
# https://trac.ffmpeg.org/wiki/Scaling


# Resize video, adding black boxes around
# https://stackoverflow.com/questions/46671252/how-to-add-black-borders-to-video
ffmpeg -i input.mp4 -filter_complex "[0]pad=w=1920:h=ih:x=96:y=0:color=black" output.mp4
ffmpeg -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1"

# Generic command for scaling - https://superuser.com/a/991412/462292
ffmpeg -i input -vf "scale=w=1280:h=720:force_original_aspect_ratio=1,pad=1280:720:(ow-iw)/2:(oh-ih)/2" output


# Build video with 15 seconds from image
# https://stackoverflow.com/questions/25891342/creating-a-video-from-a-single-image-for-a-specific-duration-in-ffmpeg
ffmpeg -loop 1 -i image.png -c:v libx264 -t 15 -pix_fmt yuv420p -vf scale=320:240 out.mp4

# Build video from single image and audio
# https://superuser.com/questions/1041816/combine-one-image-one-audio-file-to-make-one-video-using-ffmpeg
ffmpeg -loop 1 -i ima.jpg -i audio.wav -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest out.mp4
# https://stackoverflow.com/questions/68153115/ffmpeg-create-mp4-from-mp3-and-jpg
ffmpeg -y -loop 1 -i test.png -i music.mp3 -shortest -c:v libx264 -pix_fmt yuv420p -b:v 5M -preset slow video.mp4


# Add fade
# https://askubuntu.com/questions/1128754/how-do-i-add-a-1-second-fade-out-effect-to-the-end-of-a-video-with-ffmpeg
ffmpeg -i input.mp4 -vf "fade=type=in:duration=1,fade=type=out:duration=1:start_time=9" -c:a copy output.mp4


# Change volume
# https://trac.ffmpeg.org/wiki/AudioVolume
ffmpeg -i input.mp3 -filter:a "volume=0.5" output.mp3


# Reduce noise
# https://onelinerhub.com/ffmpeg/how-to-reduce-background-audio-noise-using-afftdn
# https://superuser.com/questions/733061/reduce-background-noise-and-optimize-the-speech-from-an-audio-clip-using-ffmpeg