"Convert video from Dolby Vision profile 7 to 8. Requires dovi_tool, mkvtoolnix-cli, and ffmpeg.

dv_p7_to_p8.fish

#!/usr/bin/env fish

function dv_p7_to_p8 -a input output skip_clean -d "Convert video from Dolby Vision profile 7 to 8"
    if test -z $input || test -z $output
        return
    end

    set -l container (path extension "$output")
    set -l video_stream_p8 (path normalize "$(pwd)/$(path change-extension '' $(path basename $input))_video_p8.hevc")
    set -l contained_video_stream (path normalize "$(pwd)/$(path change-extension '' $(path basename $input))_video_p8.mkv")
    if test container = mp4
        echo "Output container is MP4, skipping subtitles..."
    else
        set -l subflag "-map 1:s?"
    end

    if not test -f "$video_stream_p8"
        echo "Extracting video and converting at path: $video_stream_p8"
        mkvextract tracks "$input" 0:/dev/stdout | dovi_tool --mode 2 convert - --output "$video_stream_p8"
    end

    if not test -f "$contained_video_stream"
        echo "Building contained video stream at path: $contained_video_stream"
        mkvmerge -o "$contained_video_stream" "$video_stream_p8"
        if test -z $skip_clean
            rm -vf "$video_stream_p8"
        end
    end

    if not test -f "$output"
        echo "Writing final output at path: $output"
        ffmpeg -i "$contained_video_stream" -i "$input" -strict experimental \
            -map 0:v -map 0:d? \
            -map 1:a? $subflag \
            -vcodec copy -acodec ac3 -b:a 640k \
            "$output"

        if test -z $skip_clean
            rm -vf "$contained_video_stream"
        end
    end
end