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• How to collect specific Youtube channel uploaded videos and use FFMPEG to convert to MP3 [on hold]

  6 novembre 2014, par Daniel Kirkby

  I am currently attempting to create a php script that can crawl a Youtube channel’s uploaded videos and parse them through FFMPEG to a mp3.

  .eg (https://www.youtube.com/user/PandoraMuslc/videos) download each .flv then convert to mp3 using a script that can do the whole channel instead of one at a time as there are a few hundred uploads. while I have found scripts that can make FFMPEG convert to mp3 and scripts to show the uploaded videos in XML I kinda just want to figure out how to get each video automaticly, Maybe a script that can be cron’d ?

• Capture Thumbnail Whilte Downloading Youtube Video

  31 décembre 2012, par Minime

  I want to capture a thumbnail of Youtube video on certain timeline. (e.g. 3.2sec)
  I used ytdl and fluent-ffmpeg with node.js to implement it.
  It was possible to capture a thumbnail when the downloading has finished.

  var fs = require('fs');
  
  var ytdl = require('ytdl');
  
  var ffmpeg = require('fluent-ffmpeg');
  
  var videostream = fs.createWriteStream('video.flv');
  
  var myytdl = ytdl('http://www.youtube.com/watch?v=A02s8omM_hI');
  
  myytdl.pipe(videostream);
  
  videostream.on('close',function() {
  
    console.log('Downloading complete...');
  
    var proc = new ffmpeg({ source: 'video.flv', nolog: true })
  
    .withSize('150x100')
  
    .takeScreenshots(1, '/home/test', function(err) {
  
      console.log(err || 'Screenshots were saved');
  
    });
  
  });

  However, I couldn't implement to capture a thumbnail while downloading. Basic idea of what I want to do is as below.

  1. Download Youtube video starting at X sec. (Worked)
  2. Pipe it to Readable/Writable(Duplex) Memory Stream (Need Advise)
  3. During downloading, check if stream has enough data to capture the first frame, which is at X sec. (Need Advise)
  4. Capture the first frame, then stop downloading

  For 2, I've realized that node.js will have Duplex Stream on coming v0.9.x, but it seems not working properly. Anyone who has good idea to implement bullet 2,3 ?

• Is "begin" param dead in Youtube's *.c.youtube.com/videoplayback ?

  23 janvier 2013, par Minime

  I tested Youtube video download with begin param using ytdl, and realized that it's not working properly. Below is an URL with begin param. (It won't work on your side because it's session-IP address based.)

  http://r4---sn-o097znee.c.youtube.com/videoplayback?ratebypass=yes&cp=U0hUTVNOT19JTENONF9LSFNIOmtjaWozaFd5Vnhl&newshard=yes&source=youtube&ipbits=8&fexp=916600%2C906072%2C923114%2C914093%2C916626%2C920704%2C912806%2C922403%2C922405%2C929901%2C913605%2C925710%2C929104%2C929110%2C908493%2C920201%2C913302%2C919009%2C911116%2C926403%2C910221%2C901451&id=58dafac107cd7cae&key=yt1&mt=1358307193&gcr=us&ms=au&itag=46&upn=efQT2cDue5M&ip=xxxx&sparams=cp%2Cgcr%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&expire=1358331742&sver=3&mv=m&signature=C957313FEC2AC174F72CEFE52BF663ABAC8D0E4B.27F8485A36BE654CA25D3CA75A927D443523CA68&begin=12000

  I traced Youtube site by myself to see if there are any recent changes on their black boxed
  API. And I found that begin param is no longer put in videoplayback, but put in user_watch as below.

  http://www.youtube.com/user_watch?video_id=-YFiHW59ASs&ptk=StyleHaul&referrer=None&t=vjVQa1PpcFPiDK6v9s-rWrDn8gNv0QvpjyCIjiAgsm0=&asv=3&fmt=34&cpn=BOOMP-Bzbv1jikj9&el=detailpage&plid=AATTaqGSIR9CQ-MJ&begin=70000

  Its response is

  <?xml version="1.0" encoding="utf-8"?>

  And videoplayback only has range param, which indicate byte range where to pull. However, I couldn't figure out exact mechanism how new begin param works.

  http://r8---sn-p5q7yne6.c.youtube.com/videoplayback?algorithm=throttle-factor&burst=40&cp=U0hUTVNSVl9IT0NONF9LTFpGOlY5MU5RYVYtWHFw&cpn=BOOMP-Bzbv1jikj9&expire=1358378535&factor=1.25&fexp=919361%2C910207%2C916612%2C913112%2C912806%2C922403%2C922405%2C929901%2C913605%2C925710%2C929104%2C929110%2C908493%2C920201%2C913302%2C919009%2C911116%2C910221%2C901451&gcr=us&id=f981621d6e7d012b&ip=xxxx&ipbits=8&itag=34&keepalive=yes&key=yt1&ms=au&mt=1358354777&mv=m&newshard=yes&ratebypass=yes&signature=AA38C7074D8FA9DA44D01D9BB3675C78D05B9794.66D67C5AB111D8FB9EC3C8A141BBB11D9D70545D&source=youtube&sparams=algorithm%2Cburst%2Ccp%2Cfactor%2Cgcr%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&sver=3&upn=aLby9GtO0sU&range=3563520-5345279

  Can anyone explain how to pull a video starting from specific position(msec) in new API ?