This is a collection of command line one-liners for manipulating with audio and video files

audio-video-manipulation.md

Audio/Video Manipulation Command-Line One-Liners

• concatenate-video.sh
• convert-to-h265.sh
• delay-audio.sh
• extract-audio.sh
• image-to-video.sh

concatenate-video.sh

## Write list of videos in a text file

$ cat mylist.txt
file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'

## Concatenate videos

$ ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

# -f concat => filter concatenate
# -safe 0   => safe mode for paths
# -i        => input
# -c copy   => use the same codec as origin

convert-to-h265.sh

## Convert video to H.265/HVEC

ffmpeg -i input.mp4 -c:v libx265 -tag:v hvc1 output.mp4

# -c:v libx265 => for video use codec H.265 (HEVC)
# -c:v hevc_videotoolbox => for video use codec H.265 (HEVC) with hardware acceleration on Apple (faster, but lower quality)
# -tag:v hvc1  => enable playing in Apple QuickTime

delay-audio.sh

## Combine video with audio, audio is delayed (shifted, in offset) 75 seconds

ffmpeg -i video.mp4 -itsoffset 75 -i audio.m4a -c:v copy -c:a copy -map 0:v -map 1:a output.mp4

# -itsoffset 75 => following file input is 75 seconds delayed
# -c:v copy     => copy video codec
# -c:a copy     => copy audio codec
# -map 0:v      => from the first input take a video stream
# -map 1:a      => from the second input take a audio stream
# -i            => input file

extract-audio.sh

## Inspect original audio format

ffprobe video.mp4

## Extract audio

ffmpeg -i video.mp4 -vn -c:a copy audio.m4a

# -vn          => -vn / -an / -sn / -dn options can be used to skip inclusion 
#                 of video, audio, subtitle and data streams respectively
# -c:a copy 5  => audio codec copy

image-to-video.sh

## Convert image to video

convert -quality 100 -delay 5 image.png video.mp4

# -quality 100 => quality of compression (0 worst quality -- 100 best quality)
# -delay 5     => 5 seconds length of video