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• ffmpeg to rip mp3 from mp4 in ruby

  11 septembre 2014, par RichardC

  Trying to make basic Ruby script utilising ffmpeg to download a video from Youtube and then rip the mp3 from that video.
  Problem is each time the script fails when trying to separate the two, even though the command themselves run fine outside of the.
  I think the issue is that Ruby is treating the video as a string, but I’m not sure.

  def input
  
      #print "Enter Video URL: "
  
      #@target_video = gets
  
      #@target_video ||= ''
  
      #@target_video.chomp
  
      @target_video = 'https://www.youtube.com/watch?v=bYG1qccSUAw'
  
  end
  
  
  
  def grab
  
      #@video = `viddl-rb #{@target_video}`
  
      `viddl-rb #{@target_video}`
  
  end
  
  
  
  def rip
  
      `ffmpeg -i #{grab} new.mp3`
  
  end
  
  
  
  input
  
  rip

  I tested it in irb and when I tried @video.class it returned string, I think this is where it’s going wrong but I’m not certain.
  The video does download successfully but fails on teh rip.

  Output and error :

  ruby youtube_downloader.rb 
  
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
  
                                   Dload  Upload   Total   Spent    Left  Speed
  
  100 30.4M  100 30.4M    0     0  2580k      0  0:00:12  0:00:12 --:--:-- 2683k
  
  ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug 25 2014 19:47:15 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libavresample   1.  3.  0 /  1.  3.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Loading: No such file or directory
  
  sh: line 1: Plugins: command not found
  
  sh: line 2: Will: command not found
  
  sh: line 3: Analyzing: command not found
  
  sh: line 4: Using: command not found
  
  sh: line 5: [YOUTUBE]: command not found
  
  sh: line 6: [YOUTUBE]: command not found
  
  sh: line 7: Using: command not found
  
  sh: line 8: Download: command not found
  
  sh: line 9: Error:: command not found
  
  sh: line 11: Backtrace:: command not found
  
  sh: -c: line 12: syntax error near unexpected token `:27:in'
  
  sh: -c: line 12: `(eval):27:in `initialize''

• FFmpeg Negative Duration [migrated]

  22 septembre 2014, par filby

  i have a large number of small videos (parts of a larger) of the form :

  Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder         : Lavf55.43.100
  
  Duration: 00:00:05.53, start: -1.831497, bitrate: 3355 kb/s
  
  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 4760 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 157 kb/s (default)
  
  Metadata:
  
    handler_name    : SoundHandler

  I want to completely discard the negative start, the 1.83 seconds, and keep only the 3.67 seconds in the positive ’axis’.

  I cut the videos with the correct duration however i believe due to some sync i did in sound (in the original), resulted in me having a video of 5.53 second, of which 1.83 is audio only, and the last 3.67 seconds are the ones i want to keep (and the ones i did cut).

  In a video player i can watch the 3.67 seconds i want to however if i extract the audio i get +1.83 seconds of audio at start from the original video (from which i cut the parts) which i didnt intend to cut. What can i do ;

  P.S.
  Example of the command i used to cut the part :

  ffmpeg -ss 818 -i input -t 3.67 -codec:v libx264 -profile:v high -preset slow -b:v 5000k -maxrate 5000k -threads 0 -codec:a copy output

• FFMPEG : How To Break steam and Retry Again Automatically

  8 décembre 2019, par Varun

  The Live Stream is in m3u8 format
  I am Using youtube-dl with --no-part to record the video.

  The problem is that I can’t watch the video while it’s recording. I need to Stop Recording with Ctrl+C to watch the recorded video.

  So I am thinking if there could be a python script with a loop that will break the live stream on every 1 hr of recording automatically and run the same code again with the different filename in output.

  In this way, I will get a recording of every one hr separately.