vidterm.sh

#!/bin/bash

if [[ $# -ne 1 ]]; then
    printf "Usage: %s VIDEO_FILE\n" $0
    exit 1
fi

SOURCE=$1

FRAMERATE=$(ffmpeg -i test.mp4 2>&1 | grep -oE '[0-9]+ fps' | grep -oE '^[0-9]+')

MICROSECONDS_PER_FRAME=$((1000000 / $FRAMERATE))
TEMP_FRAME=/tmp/frame.jpg
TEMP_FRAME_ASCII=/tmp/frame-ascii.txt
SECONDS=0
MINUTES=0
POSITION=0
POSITION_IN_MICROSECONDS=0

function microtime() {
    echo $(($(date +%s%N)/1000))
}

function render_frame() {
    ffmpeg -y -loglevel quiet -i $SOURCE -r $FRAMERATE -ss "$POSITION" -frames: 1 -s 320x240 $TEMP_FRAME
    jp2a -z $TEMP_FRAME > $TEMP_FRAME_ASCII
}

render_frame

# play audio in background
ffplay -hide_banner -loglevel panic -nodisp $SOURCE &

while [[ true ]]; do
    
    cat $TEMP_FRAME_ASCII

    START_TIME=$(microtime)

    CURRENT_TIME=$(microtime)
    ELAPSED_TIME=$((CURRENT_TIME - START_TIME))

    render_frame

    while [[ ELAPSED_TIME -lt MICROSECONDS_PER_FRAME ]]; do
        CURRENT_TIME=$(microtime)
        ELAPSED_TIME=$((CURRENT_TIME - START_TIME))
    done
    
    POSITION_IN_MICROSECONDS=$((POSITION_IN_MICROSECONDS + ELAPSED_TIME))

    POSITION=$( echo "scale=2; ($POSITION_IN_MICROSECONDS) / 1000000.0" | bc -l)
    
    echo $POSITION | grep -q -E "^\."

    if [[ $? -eq 0 ]]; then
        POSITION="0$POSITION"
    fi
done