#! /bin/zsh
#
# this file:
#   http://user.it.uu.se/~embe8573/conf/.zsh/audio
#   https://dataswamp.org/~incal/conf/.zsh/audio

space () {
    local snd=~/mm/white/space.webm
    pl --volume=30 --loop $snd
}

rm-audio () {
    local file=$1

    local name=${file:r}
    local ext=${file:e}

    local video=${name}-mute.${ext}

    ffmpeg -i $file -an $video
}

put-audio-into-video () {
    local audio=$1
    local video=$2
    local start=${3:-0}

    local audio_name=${audio:r}

    local video_name=${video:r}
    local video_ext=${video:e}

    ffmpeg                    \
        -i  $audio            \
        -ss $start            \
        -i  $video            \
        -strict experimental  \
        ${video_name}-${audio_name}.${video_ext}
}

# does this work?
img-audio () {
    local img=$1
    local img_name=${img:r}

    local audio=$2
    local audio_name=${audio:r}

    local sec=$(video-seconds $audio)

    local out=${audio_name}-${img_name}.mp4

    ffmpeg -y                    \
           -loop 1               \
           -i $img               \
           -i $audio             \
           -c:v libx264          \
           -tune stillimage      \
           -t $sec               \
           -c:a aac              \
           -strict experimental  \
           -b:a 192k             \
           -pix_fmt yuv420p      \
           -vf scale=1280:720    \
           -shortest             $out
}