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• Autogenerate HTML5 tags from YouTube-DL

  13 novembre 2015, par Terence Eden

  I’m using youtube-dl to download videos I’ve stored on YouTube. It gives me the ability to download various formats, thumbnails, and subtitles.

  Is there any way I can automatically generate an HTML5 <video></video> snippet from the downloaded files ?

  For example, I’d like the end result to be .txt file containing :

  <video poster="file-160.jpg">
  <source src="file-135.mp4" type="video/mp4; codecs=mp4a.40.2, avc1.42001E">
  <source src="file-43.webm" type="video/webm; codecs=vorbis, vp8.0">
  ...
  <track kind="subtitles" src="file-160.en.srt">
</track></source></source></video>

  At the moment, I have a file list like :

  • file-135.mp4
  • file-18.mp4
  • file-134.mp4
  • file-160.mp4
  • file-43.webm
  • file-5.flv
  • file-36.3gp
  • file-17.3gp
  • file-160.jpg
  • file-160.en.srt

  I can run some Python/Ruby/bash over them to generate the <source src="..."></source>code>, but the problem is, I don't know what codecs each of those videos are, so I can't generate the <code>; codecs= portion.

  Using avconv or ffmpeg I can get the codecs, but not in a suitable format for embedding into HTML.

  I’m wary of asking "what tool should I use" - but is there any way to get avconv/ffmpeg/youtube-dl to spit out the codec information in a format I can put into an HTML5 tag ?

  Or, is there a way to get YouTube-DL only to spit out HTML5 compatible files with known codecs ?

• Converting youtube videos to mp3 in golang using a ffmpeg binary

  19 août 2015, par Bera

  With golang it’s possible to extract a mp3 file from a given youtube video url ?

  Is needed to download a video in mp4 format and then extract the audio in the mp3 format.

  Would be better to use a lib like youtube-dl to download the video in mp4 and after invoke a ffmpeg binary to extract the audio or there is a easy way using only go libraries or binds ?

  thanks for your help.

• Can I make calls to APIs such as youtube-dl and ffmpeg from a chrome-app ?

  8 janvier 2015, par ErickR

  First of all, I haven’t started the implementation of the system I’m about to describe, as I didn’t want to commit on implementing something I did not know if was possible.

  So, what I’m trying to achieve is to build a chrome-app to download the audio from certain websites (e.g. youtube and soundcloud) using youtube-dl, post process it using ffmpeg and then upload it to a cloud service via some api. The reason I want to do it via a chrome-app is because I could do all the work on the client side (no need for servers) and I’d have the ability to insert javascript into the pages using content scripts, which would make the app pretty simple to use (I could create buttons such as ’download song’ and stuff like that).

  Although I have already read the documentation explaining the NaCl Technical Overview and some of the Application Structure, I still am not sure as to whether I would be able to make these calls via some C/C++ module or if I would get denied due to security reasons.

  To summarize : considering that the user has the needed dependencies in his system (youtube-dl, python, ffmpeg and etc.), is it possible to make calls to third party APIs such as the ones described before via a chrome-app using NaCl ?

  Thank you all in advance,