###### ---- SNIP ----- #######
# make a fifo to send raw yuv to, to be encoded by ffmpeg
mkfifo "$WORK_DIR/enc.fifo"
#cat "$WORK_DIR/enc.fifo" | yuvcorrect | "${IMGENC_CMD[@]}"  &
"${IMGENC_CMD[@]}" < "$WORK_DIR/enc.fifo" &
exec 3> "$WORK_DIR/enc.fifo"

##### ---- SNIP ----- ######

# effects unfinished - only dissolve in/out for now
for f in ${!INFILES[@]}; do
    # encode still frames
    if ((f==0)); then
        ppmtoy4m -n $SLIDE_FRAMES -A 10:11 -I p -r -S 420mpeg2 -r "${INFILES[f]}"
    else
        ppmtoy4m -n $SLIDE_FRAMES -A 10:11 -I p -r -S 420mpeg2 -r "${INFILES[f]}" | yuvcorrect -T NO_HEADER
    fi

        base_ppm="$WORK_DIR/${f}.ppm"
        if ((f == (${#INFILES[@]} - 1) )); then
            overlay_ppm="$WORK_DIR/0.ppm"
        else
            overlay_ppm="$WORK_DIR/$((f+1)).ppm"
        fi

        [[ $TV_STANDARD = "ntsc" ]] && fade_frames=30 || fade_frames=25
        fade_incr=$(bc -l <<< "scale=2; 100 / $fade_frames") >&2
        fade_slide=0
        echo >&2
        for ((i=0; i<fade_frames; i++)); do
            BLEND_AMT=$(bc -l <<< "scale=2; $fade_slide * $fade_incr") >&2
            composite_cmd=(composite -blend $BLEND_AMT -depth 8 "$overlay_ppm" \
            "$base_ppm" "$WORK_DIR/animenu/$(printf %06d%s $i .ppm)")
            "${composite_cmd[@]}" >&2
            spin "Compositing ${overlay_ppm##*/} over ${base_ppm##*/} with -blend $BLEND_AMT" >&2
            let fade_slide=fade_slide+1
        done
        echo >&2
        echo "Running ppm2y4m to encode ppms" >&2
        #ffmpeg -f image2 -i "$WORK_DIR/animenu/%06d.ppm" -pix_fmt yuv420p -f yuv4mpegpipe -
        cat "$WORK_DIR"/animenu/*.ppm | ppmtoy4m -n $fade_frames -A 10:11 -I p -r -S 420mpeg2 | yuvcorrect -T NO_HEADER
        rm -f "$WORK_DIR"/animenu/*.ppm
        if ((f == (${#INFILES[@]} - 1) )); then
            ppmtoy4m -n $SLIDE_FRAMES -A 10:11 -I p -r -S 420mpeg2 -r "${INFILES[0]}" | yuvcorrect -T NO_HEADER
        fi
done >&3


# close the pipe
exec 3>&-