[YouTube] Feature request, force download.

[zillionn]

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First of all thank you for your hard work making this software so good!

So, let's get straight to the point. What I need is an URL to the YouTube video that will force the browser to download it with a custom name, not playing it, so the user will be able to download the video with one click. Let's say I have this URL:
https://www.youtube.com/watch?v=pSqeQlnOhJQ

Running the following command I get the URL to the best mp4 video:

youtube-dl --skip-download -g -f mp4 https://www.youtube.com/watch?v=pSqeQlnOhJQ

Which looks something like this:
https://r4---sn-ab5l6nzd.googlevideo.com/videoplayback?mt=1480783546&expire=1480805390&nh=IgpwcjA2LmxnYTA3KgkxMjcuMC4wLjE&sparams=clen%2Cdur%2Cei%2Cgcr%2Cgir%2Cid%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&clen=20832787&requiressl=yes&ratebypass=yes&ipbits=0&itag=18&upn=w2HNKIqTxpQ&lmt=1428137939371231&gcr=us&mv=u&ei=rvdCWMKLDoGD8wSil5aYCQ&id=o-AOzRUsXVe3m6sOS4bm6IJalJG2EBfGkD0YfmokiOa6UT&ms=au&source=youtube&pl=20&dur=392.556&key=yt6&ip=X.X.X.X&gir=yes&mm=31&mn=sn-ab5l6nzd&mime=video%2Fmp4&signature=76982B58B469AC887AECEDE95D11D38A43BDEFA8.7218B84E1E8F8DB00BEA6F29A03BD1F4795E0CD1

Opening that URL on a different machines is returning 403 Forbidden, but we could use "redirector.googlevideo.com" to fix this. So the new video URL will be:
https://redirector.googlevideo.com/videoplayback?mt=1480783546&expire=1480805390&nh=IgpwcjA2LmxnYTA3KgkxMjcuMC4wLjE&sparams=clen%2Cdur%2Cei%2Cgcr%2Cgir%2Cid%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&clen=20832787&requiressl=yes&ratebypass=yes&ipbits=0&itag=18&upn=w2HNKIqTxpQ&lmt=1428137939371231&gcr=us&mv=u&ei=rvdCWMKLDoGD8wSil5aYCQ&id=o-AOzRUsXVe3m6sOS4bm6IJalJG2EBfGkD0YfmokiOa6UT&ms=au&source=youtube&pl=20&dur=392.556&key=yt6&ip=X.X.X.X&gir=yes&mm=31&mn=sn-ab5l6nzd&mime=video%2Fmp4&signature=76982B58B469AC887AECEDE95D11D38A43BDEFA8.7218B84E1E8F8DB00BEA6F29A03BD1F4795E0CD1

Which plays fine on different machines, but I need an URL that will force the browser to download the video. I found out that adding "&title=" at the end of the URL changes the filename but doesn't force download it. And I know it is possible because I'm using one site that generates exactly the URL I need. For instance, this URL will force the browser to download the video with filename "Test 123.mp4":
http://redirector.googlevideo.com/videoplayback?ratebypass=yes&mime=video%2Fmp4&ipbits=0&mm=31&mn=sn-5hne6nlr&itag=18&dur=392.556&mt=1480781984&mv=m&ms=au&ip=X.X.X.X&lmt=1428137939371231&gcr=it&id=o-AHYW4_sjmE7BnsIRkMtHQhxU_k9lVrPaozJhsLbFxjO5&expire=1480803893&upn=b-WaaAQcc34&nh=IgpwZjAxLmFtczE1Kg4xNDkuMTQuMTQyLjEwNQ&key=yt6&pl=24&sparams=dur%2Cgcr%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cnh%2Cpl%2Cratebypass%2Csource%2Cupn%2Cexpire&source=youtube&initcwndbps=2930000&signature=B02CBC1C64A130E7F00F4297F79137A4C4332B62.73E09C5AD4B31FD2B6AE291F99AE0A73F6CBFE0A&title=Test%20123

I see that some params are missing from this URL, but if I try to remove them from the URL that youtube-dl is generating, I'm again getting 403 Forbidden.

Thank you for your help.

[dstftw]

Out of scope of youtube-dl.