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• Extract just the audio link from a youtube video without converting

  19 janvier 2017, par kamron shaw

  I know there are hundreds of sites to convert youtube video to mp3. Most of them do it by first downloading the video and then converting it to mp3(or any other audio format) on their server using youtube-dl, ffmpeg or similar programs.

  What I want to know is, is there any way I can just extract the audio link for any youtube video ? I don’t know if it’s possible but I saw a couple of websites doing it .

  First Website : Openaisearch.com
  This website simply gives a download link for the audio(getting it from youtube videos). I searched for a song and saw the download url, it looked something like this :

  https://redirector.googlevideo.com/videoplayback?source=youtube&requiressl=yes&clen=3814013&upn=dzwY9aUVYME&lmt=1469875393441562&expire=1484854959&mime=audio%2Fmp4&nh=IgpwcjAxLnNlYTA5Kg01Mi45NS4yMTYuMTAy&itag=140........... 

  I believe that this is not done by first downloading and converting the video to audio format(Correct me if I am wrong).
  Although the file which gets downloaded after using this link is without any extension, but adding ".m4a" at the end of downloaded file does the work.

  Second Website : http://keepvid.com/ ?url=https ://www.youtube.com/watch?v=PT2_F-1esPk

  Again similar website with similar audio link. You can check by visiting the URL and see link of audio files.

  Any idea how these websites get that "googlevideo.com" link ? Do they scrap the youtube video links or something ?

  Thanks.

• Fail to get the statistics of https video using ffprobe

  23 janvier 2017, par amith

  I want to collect the statistics of a video stream backed by https url.

  on executing
  ffprobe https://www.youtube.com/watch?v=YbYjtSFa5Fs

  I get the following output

  vagrant@kaybus:/vagrant/kaybus$ ffprobe https://www.youtube.com/watch?v=YbYjtSFa5Fs
  
  ffprobe version N-80901-gfebc862 Copyright (c) 2007-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 48.101 / 57. 48.101
  
    libavformat    57. 41.100 / 57. 41.100
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 47.100 /  6. 47.100
  
    libavresample   3.  0.  0 /  3.  0.  0
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  [tls @ 0x3547140] A TLS packet with unexpected length was received.
  
  https://www.youtube.com/watch?v=YbYjtSFa5Fs: Input/output error

  [tls @ 0x3547140] A TLS packet with unexpected length was received.
  How to fix the above error ?

  https is listed in ffprobe’s supported input and output protocols.

  ffprobe -version

  vagrant@kaybus:/vagrant/kaybus$ ffprobe -version
  
  ffprobe version N-80901-gfebc862 Copyright (c) 2007-2016 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)

  Thanks

• appending a string constant selectively within a while loop in bash

  29 janvier 2017, par Maxwell Chandler

  I have a script called automateutube that I edit in VIM and execute in the terminal with sh ./automateutube.sh This script pulls youtube links from a file called songs.txt and downloads the video from youtube then extracts the audio.

  The songs.txt file looks like this

  https://www.youtube.com/watch?v=IxQOlZ3pqtI
  
  https://www.youtube.com/watch?v=IxQOlZ3pqtI
  
  https://www.youtube.com/watch?v=IxQOlZ3pqtI
  
  https://www.youtube.com/watch?v=IxQOlZ3pqtI

  It is just a bunch of links, one per line.

  The script looks like this

  #!/bin/bash
  
  
  
  while read p; do    
  
  
  
  x=/tmp/.youtube-dl-$(date +%y.%m.%d_%H.%M.%S)-$RANDOM.flv
  
  
  
  youtube-dl --audio-quality 160k --output=$x --format=18 "$p"
  
  
  
  ffmpeg -i $x -acodec libmp3lame -ac 2 -ab 128k -vn -y "$p"
  
  
  
  rm $x
  
  
  
  done code>

  Now the first part executes. It downloads the video and starts to unpack it.

  It is the second part that fails. ffmpeg -i $x -acodec libmp3lame -ac 2 -ab 128k -vn -y "$p"

  This is because "$p" is supposed to be in format "filename.mp3" However as it is p takes the value of a youtube link, without ".mp3" appended.

  This works for the first line

  youtube-dl --audio-quality 160k --output=$x --format=18 "$p"

  because "$p" is supposed to be in the form of a link there.

  Now I have tried adding three lines in

  a="$.mp3"
  
  b="$p"
  
  c=$b$a

  and making ffmpeg -i $x -acodec libmp3lame -ac 2 -ab 128k -vn -y "$p"

  into ffmpeg -i $x -acodec libmp3lame -ac 2 -ab 128k -vn -y "$c"

  but I am still getting an error. Any ideas ?

  parse error, at least 3 arguments were expected, only 1 given in string ’om/watch ?v=sOAHOxbMOJY’