| 12345678910111213141516171819202122232425262728293031323334353637383940414243 |
- #!/usr/bin/env bash -x
- set -euo pipefail # bash strict mode
- # #!/usr/bin/env bash
- set -euo pipefail # bash strict mode
- basename=${1##*/}
- noext=${basename%.*}
- directory="/tmp/your/path/${noext}"
- mkdir -p "$directory"
- length="$(ffprobe -i "$1" -show_entries format=duration -v quiet -of csv='p=0')"
- image_count=$( echo "l(${length})/l(1.2)" | bc -l)
- framerate=$(ffprobe -v 0 -of csv="p=0" -select_streams V:0 -show_entries stream=r_frame_rate "$1")
- step=$( echo "${length}/${image_count}" | bc -l)
- round(){
- echo "(${1}+0.5)/1" | bc
- }
- # for (( i=0; i<$(round $length) ; i+=$(round $step) )); do
- # for (( i=0; i<$(round $length) ; i+=$(round $image_count) )); do
- # timestamp=$(date -u -d "@${i}" "+%H:%M:%S")
- # ffmpeg -y -i "$1" -ss "$timestamp" -vframes 1 -vcodec png -an -y "${directory}/${timestamp}.png"
- # mogrify -fill red -pointsize 100 \
- # -draw "text 50,50 '${timestamp}'" \
- # "${directory}/${timestamp}.png"
- # done
- # montage "${directory}/*" -geometry +10+10 grid.png
- # https://askubuntu.com/questions/874042/how-to-make-screenshot-gallery-from-command-line
- rows=$(round "sqrt(${image_count})")
- cols=$((rows + 1))
- frames=$(round "(${framerate})*${image_count}")
- ffmpeg -i "$1" -frames 1 \
- -vf "select=not(mod(n\,${frames})),scale=-1:240,tile=${rows}x${cols}" \
- grid.png
- # ffmpeg -i "$1" -frames 1 -vf "select=not(mod(n\,1000)),scale=-1:240,tile=2x3" out.png
- # I'd use "ffmpeg" to do this. A command to extract PNG images at X intervals can be as simple as this...
- # ffmpeg -i input.mp4 -r 1 out%04d.png
- # Using the option -r 1 will set the output frame rate to 1 every second. Assuming the input video has a frame rate of 25 per second, the option -r 1 will output about every 25th frame. Calculate the interval you need according to the frame rate of the input. For example, to get approximately every 10th frame, use -r 2.5.
- # The output file name in this example contains %04d, which creates a numbered sequence with four digits, padded with leading zeros.
|
