youtube buffer

// Youtube for peoples with extremely slow connexion. Like me.
// All hacks like media.mediasource.enabled, media.cache_readhead_limit, etc. don't work ?
// This is a manual JS way to force it.

/*
What it does :
It pauses your youtube video. When video stop buffering it manually move the seeker to force the download.
When the download is finished, it place the cursor back to it's original position. You are then ready to play a fully buffered video.
*/

/*
How to use :
Paste this script in the console of your browser (F12 > Console). Tested on Firefox Linux.
*/

// Note : Maximize your "browser.cache.disk.capacity" (type "about:config" in Firefox) if you are loading long videos

const success = [
 'background: rgba(0,204,0,0.2)',
 'color: yellow',
 'display: block',
 'text-align: left'
].join(';');

const failure = [
 'background: rgba(255,0,0,0.2)',
 'color: yellow',
 'display: block',
 'text-align: left'
].join(';');

const warning = [
 'background: rgba(55, 102, 0,0.2)',
 'color: orange',
 'display: block',
 'text-align: left'
].join(';');

console.info('%c Youtubeforce ftw!', success);
var current_download = 0;
var previous_download = 0;
var loop_since_download = 0;
var loop = 1;
var player = document.getElementById('movie_player');
var duration = player.getDuration();
var first_chunk_loaded =  Math.round((player.getVideoBytesLoaded() / player.getVideoBytesTotal())*100);
var last_chunk_loaded = 0;
var first_buffer_time = false;
var waiter = 0;
var total_restart_buffer = 0;
if(player){
    var inter = setInterval(function(){
        var d = new Date();
        current_download = player.getVideoBytesLoaded();
        if(waiter > 0) waiter--;
        if(waiter <= 0){
            if(player.getVideoBytesLoaded() != "NaN"){
                // Try to buffer if buffer is not at the end
                if(player.getVideoBytesLoaded() < (player.getVideoBytesTotal() - 0.09)){
                    // Video is not loading anymore...
                    if(current_download == previous_download){
                        // Video buffer is stop. wait a bit.
                        loop_since_download++;
                        if(loop_since_download > 10){
                            if(loop_since_download > 30){
                                console.log("%c Slow connexion..., pause for 20 loops "+d, error);
                                waiter = 20;
                            }
                            if(!first_buffer_time){
                                first_buffer_time = player.getCurrentTime();
                            }
                            console.log("%c Restart buffer (10 loops since last download), and pause for 10 loops... (already restarted "+total_restart_buffer+" times "+d, warning);
                            // sectotal * byteLoaded / byteTotal = sec loaded
                            var current_time_loaded = player.getDuration() * (player.getVideoBytesLoaded() / player.getVideoBytesTotal());
                            player.seekTo(current_time_loaded - 2); // - 2sec
                            player.pauseVideo();
                            waiter = 10;
                            total_restart_buffer++;
                        }
                    // Video is still loading...
                    }else{
                        previous_download = player.getVideoBytesLoaded();
                        loop_since_download = 0;
                        var current_chunk_loaded =  Math.round((player.getVideoBytesLoaded() / player.getVideoBytesTotal()) * 100);
                        console.info("%c Video is buffering properly ("+current_chunk_loaded+"%). "+loop+" loops, and "+loop_since_download+" iteration since last chunk, wait 10 loops "+d, success);
                        waiter = 10;
                    }
                    loop++;
                }else{
                    last_chunk_loaded =  Math.round((player.getVideoBytesLoaded() / player.getVideoBytesTotal())*100);
                    console.log("%c Everything is loaded or the tab is inactive... Wait 50sec. Total number of buffer restart : "+total_restart_buffer+" and Total buffered : "+last_chunk_loaded+"%. Buffered on launch : "+first_chunk_loaded, success);
                    waiter = 50;
                    // restarting to first buffer and play
                    if(first_buffer_time){
                        player.seekTo(first_buffer_time);
                        first_buffer_time = false;
                    }
                }
            }else{
                console.log("%c Error getting stream. Waiting..., wait 10 loops", error);
                waiter = 10;
            }
        }else{
                //console.log("We are waiting...");
            }
    },1000);
}