FFMPEG commands for creating a video containing a sequence of images with the original video's audio.

ffmpeg-commands.md

Turn a video into an MP3:

ffmpeg -i filename.mp4 filename.mp3

combine video from first file and audio from second file:

ffmpeg -t 12:54.00 -i mash.mp4 -i dat_beat.mp4 -acodec copy -vcodec copy final-skies.mp4

concat one or more video files:

fffmpeg -f concat -safe 0 -i meta.txt -c copy mash.mp4

where list.txt contains:

file 'file1.mp4'
file 'file2.mp4'
file 'file3.mp4'
file 'file3.mp4'

Also see: http://trac.ffmpeg.org/wiki/Slideshow:

In this example the input images are sequentially named img001.png, img002.png, img003.png, etc.

ffmpeg -framerate 24 -i img%03d.png output.mp4

installing FFMPEG

https://github.com/adaptlearning/adapt_authoring/wiki/Installing-FFmpeg

mp3-video-combinator.sh

#!/usr/bin/env bash

set -o errexit
set -o pipefail
set -o nounset
set -x

export IFS=$'\n'

mkdir -p out

nextFileIndex=1

for mp3 in songs/*; do
    # Convert non-MP3 files to MP3.
    if ! [[ "${mp3}" =~ \.[mM][pP]3$ ]]; then
        ffmpeg -y -i "${mp3}" -map 0:a audio-input.mp4
        songDuration="$(ffmpeg -i audio-input.mp4 2>&1 | grep Duration | awk '{print $2}' | tr -d , || true)"
        mp4="$(basename "$(echo "${mp3}" | sed 's/\.[^\.]*$/.mp4/')")"
        if ! [[ "${mp4}" =~ \.mp4$ ]]; then
            mp4="${mp4}.mp4"
        fi
    else
        songDuration="$(mp3info -p "%S" "${mp3}")"
        # Convert the mp3 to mp4.
        ffmpeg -y -i "${mp3}" -map 0:a audio-input.mp4
        mp4="$(basename "$(echo "${mp3}" | sed 's/\.[mM][pP]3$/.mp4/')")"
    fi

    # Select a video file.
    i=1
    for vidSource in video-sources/*; do
        if [[ $i -eq $nextFileIndex ]]; then
            break
        fi
        i=$(($i+1))
    done
    nextFileIndex=$(($nextFileIndex+1))

    outFile="out/${mp4}"

    # Skip if destination already exists.
    if [[ -f "${outFile}" ]]; then
        echo "[info] Skipping song='${mp3}' because outFile='${outFile}' already exists"
        continue
    fi

    echo "MP3=${mp3} VID-SOURCE=${vidSource}"

    # Convert gif video inputs to mp4.
    if [[ "${vidSource}" =~ \.[gG][iI][fF]$ ]]; then
        ffmpeg -y -f gif -i "${vidSource}" video-source.mp4
    elif [[ "${vidSource}" =~ \.[wW][eE][bB][mM]$ ]]; then
        ffmpeg -y -fflags +genpts -i "${vidSource}" -r 24 video-source.mp4
    else
        ffmpeg -y -i "${vidSource}" -map 0:v -vcodec copy video-source.mp4
    fi

    # Build "filenames" list for input video.
    i=0
    rm -f meta.txt && touch meta.txt
    while [[ $i -lt 500 ]]; do
        echo "file 'video-source.mp4'" >> meta.txt
        i=$(($i+1))
    done

    # Concat video input to ensure it's long enough.
    ffmpeg -y -f concat -safe 0 -i meta.txt -c copy video-input.mp4

#    duration="$(ffmpeg -i audio-input.mp4 2>&1 | grep Duration | awk '{print $2}' | tr -d , )"
#    echo $duration

    ffmpeg -y -t "${songDuration}" -i video-input.mp4 -i audio-input.mp4 -acodec copy -vcodec copy "${outFile}"

    # Check for blank frame.
    #ffmpeg -i "${outFile}" -vframes 1 -r 1 -s WxH -f image2 foo-%03d.jpeg
    ffmpeg -y -i "${outFile}" -ss 00:00:01 -vframes 1 test.jpg || :
    if ! [[ -f test.jpg ]]; then
        continue
    fi

    rm -f audio-input.mp4 video-input.mp4 video-source.mp4 test.jpg
done

rm -f meta.txt