Youtube Downloader in Pascal
lazarus / 38-Networking and Web Programming

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tjpren · 2012-01-27 10:59

Hello Forum,

I was wondering if anyone had success writing a youtube download app.

I've written a little app using synapse, that can download a variety
of files - even flv's - from a web server, but when I try to download
a link from Youtube, my file is empty.

I've looked over some source code that was in a Delphi package and a
python app, and think that the issue is in the header info?

Any thoughts.

Code: [Select]procedure TForm1.Button1Click(Sender: TObject);
var
  fs : TFileStream;

begin
   fs := TFileStream.Create('C:\Download\Youtube', fmOpenWrite or
fmCreate);
   try
      HttpGetBinary('http://192.168.1.4/Test/Songs/abc.flv', fs);
   finally
      fs.Free;
   end;

end;

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typo · 2012-01-27 16:21

http://sourceforge.net/projects/cac/?source=directory

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tjpren · 2012-01-28 00:19

Thanks Typo,

It would appear as though somewhere within the YouTube URL, is an
actual location, from which you can initiate a download.  I've read
that YouTube regularly change the method of hiding this link.  A lot
of CAC's code is spent on getting this link using RegExpr.pas.  I
noticed a similar approach in a Delphi.

From a learing perspective, I'm going to look more deeply into how
this is accomplished.

When I tried CAC, it failed to download, so in the 8months since the
last release, youtube have changed their method again.

However, apart from hiding the link, the actual method of download is
accomplished with Synapse.

Thanks for the help.

Regards

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mica · 2012-01-28 14:56

Look at the SVN

the Youtube issue seems to be fixed

http://cac.svn.sourceforge.net/viewvc/cac/source/

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CFA2k · 2012-02-14 21:29

@tjpren
I´m the Developer of CaC.
If you have any questions, feel free to send me a message

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cdbc · 2019-05-18 07:47

VLC...... :-)

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Thaddy · 2025-07-03 17:04

Are you still in win95 era by commenting on a 13 + year old thread?

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yus · 2025-07-16 23:40

Hello.
I haven't tested it in a while, but it used to work.
https://github.com/seryal/wevido

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delphius · 2025-07-18 17:18

Quote from: yus on July 17, 2025, 01:40:58 amI haven't tested it in a
while, but it used to work. https://github.com/seryal/wevido

And what about decoding Youtube cipher signature?