Record YouTube streams

INSTALLATION (Windows)
1. Install streamlink: https://github.com/streamlink/streamlink
2. Install PHP 7 and make sure .php files are opened by php.exe. If you don't know what you're doing, XAMPP should install everything properly: https://www.apachefriends.org/download.html
3. Copy the code below into a file named whatever.php in notepad. Adjust the first two lines ($dir and $format) to specify the directory to save files and the default format.

USAGE
4. Run whatever.php, paste the video URL in the command line that opens and press enter. It will start recording to the directory you specified.













<?php
$dir = 'C:/Users/K/Videos'; # directory to save video
$format = '720p'; # default format

echo 'Enter URL: ';
$url = trim(fgets(STDIN));
$args = explode(' ', $url);
$url = explode('&', $args[0])[0]; # Remove stuff after &
/* There are a few arguments that you can optionally add after the URL (no hyphens):
   480/720/1080 : Choose a non-default format.
   p (play) : Open the video in VLC.
   q (quick) : Use an ugly filename instead of spending a second fetching the meta info.
   For example, you could type:
     https://www.youtube.com/watch?v=sEYzlLfLn-Y 1080 q p
   To record that video in 1080p, play it in VLC and use an ugly filename.
*/

# If the URL is a /channel/.../live style URL, get the video URL.
if(strpos($url, '/live') !== false) {
    $page = file_get_contents($url);
    preg_match('!"video_id":"(.*?)"!', $page, $matches);
    if(empty($matches[1])) {
        exit("Could not get real video URL.\n");
    }
    $url = 'https://www.youtube.com/watch?v=' . $matches[1];
}

# Format: 480, 720 or 1080
foreach(array('480', '720', '1080') as $option) {
    if(in_array($option, $args)) {
        $format = $option . 'p';
    }
}

# Play in VLC only if "play" or "p" is present in the arguments
$play = 'output';
if(in_array('play', $args) || in_array('p', $args)) {
    $play = 'record';
}

# Get video title and author.
function get_meta_info($url) {
    # Alternative: https://www.youtube.com/oembed?url=https://www.youtube.com/watch?v=lUOhCtXPN40&format=json
    $info = json_decode(file_get_contents('https://noembed.com/embed?url=' . urlencode($url)), true);
    $return = array();
    if( ! empty($info['title'])) {
        $return['title'] = $info['title'];
        $return['author'] = $info['author_name'];
    }
    else if(isset($info['error']) && $info['error'] == '401 Unauthorized') {
        # Embedding disabled. Fetch the info through a slightly slower method.
        $page = file_get_contents($url);
        preg_match('!"title":"(.*?)"!', $page, $matches);
        if( ! empty($matches[1])) {
            $return['title'] = stripslashes($matches[1]);
            preg_match('!"author":"(.*?)"!', $page, $matches);
            $return['author'] = stripslashes($matches[1]);
        }
    }
    return $return;
}

# Fetch full title for filename if "quick" and "q" are not present
$code = explode('=', $url)[1];
$title = date('Y-m-d H.i.s') . ' ' . $code;
if( ! in_array('quick', $args) && ! in_array('q', $args)) {
    $info = get_meta_info($url);
    if(empty($info)) {
        echo "Failed to fetch info.\n";
    } else {
        echo "Retrieved meta info.\n";
        $video_title = $info['title'];
        $video_author = $info['author'];
        $title = date('Y-m-d') . ' - ' . $video_author . ' - ' . $video_title . ' - ' . $code . ' (' . date('H.i.s') . ')';
        # Replace characters not allowed in filenames
        $find = array(
            '/',
            '<',
            '>',
            ':',
            '\\',
            '|',
            '?',
            '*'
        );
        $replace = array(
            '／',
            '＜',
            '＞',
            '：',
            '／',
            '｜',
            '？',
            '＊'
        );
        $title = str_replace($find, $replace, $title);
    }
}

while(true) {
    echo "Attempting to start recording.\n";
    $response = exec('streamlink ' . $url . ' ' . $format . ' --' . $play . ' "' . $dir . '/' . $title . '.mp4"');

    # If stream hasn't started, sleep until its scheduled time. After that, reattempt every 10 seconds.
    if(strpos($response, 'error: No playable streams found') !== false) {
        if( ! isset($start_time)) {
            $json = json_decode(file_get_contents('https://www.youtube.com/heartbeat?video_id=' . $code), true);
            if(isset($json['liveStreamability']['liveStreamabilityRenderer']['offlineSlate']['liveStreamOfflineSlateRenderer']['scheduledStartTime'])) {
                $start_time = (int) $json['liveStreamability']['liveStreamabilityRenderer']['offlineSlate']['liveStreamOfflineSlateRenderer']['scheduledStartTime'];
            } else {
                echo "Start timestamp not found.\n";
                break;
            }
        }
        if(time() > $start_time) {
            $start_time = time() + 10;
        }
        $remaining = $start_time - time();
        echo "Waiting " . $remaining . " seconds...\n";
        time_sleep_until($start_time);
    }
    else {
        # Stream finished.
        break;
    }
}

sleep(5);