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• Adobe connect video : FLV to MP4 (export, convert)

  8 février 2017, par Guillaume Chevalier

  I would like to convert an adobe connect video from .flv in the downloaded zip to .mp4. I have already done the steps explained in this question and answer, however I get .flv files organised like this inside the .zip :

  

  Moreover, I know that ffmpeg can merge video and sound files together as well as concatenating resulting clips directly from the command-line which could be quite useful : https://www.labnol.org/internet/useful-ffmpeg-commands/28490/

  I can’t ask the owner of the video to make it available as an .mp4 from within the adobe connect admin interface. Briefly, I would like to listen to those videos in x2 speed in VLC (just like what I do when listening to random math classes on YouTube - I put ON the x2 speed). The amount of time I would gain to watch adobe connect videos in x2 speed is MASSIVE.

  I think I am not the only one that would like to do this. There are a lot of questions on forums about downloading adobe connect videos, but the .flv format mixed with some .xml is generally a killer when the host does not make the videos properly available in .mp4.

  Dealing with the order of the .flv files is a puzzle. At least, I would not care to flush the chat away and leave some details like that behind, that would help to reconstruct the videos. Any scripts to automate the process would be useful.

• 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’

• 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