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• 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.

• ffmpeg how to extract X frames every Y interval from url efficiently

  13 décembre 2018, par Luay Gharzeddine

  I’m trying to gather data for a datascience project, and am downloading frames from online videos using ffmpeg. I want to download a subset of the frames in the video, without needing to be precise about which, the only requirement is that they are reasonably spaced apart from each other.

  I have tried

  ffmpeg -i "http://www.somevideo.com" -r 1 -f image2 "image%06d.jpg"

  and

  ffmpeg -i "http://www.somevideo.com" -vf fps=1 "image%06d.jpg"

  and eventually found the following method

  ffmpeg -ss offset1 -i "http://www.somevideo.com" -ss offset2 -i "http://www.somevideo.com" -map 0:v -frames:v 10 -start_number 0 "image%06d.jpg" -map 1:v -frames:v 10 -start_number 10 "image%06d.jpg"

  and all work, but are slow. I have found a hack where I run the following command multiple times, at different offsets, and it seems to be the fastest (where each ffmpeg command is run in parallel multithreaded)

  ffmpeg -ss offset -i "http://www.somevideo.com" -vframes frames_per_fragment -an -start_number start_index "image%06d.jpg"

  this about 25% faster than the previous method

  Is there a faster way to do this ? The issue is that downloading over a network is a bottleneck, so I want to download only the frames I need. I’m looking to download videos/frames in bulk, so any speed improvement would be helpful.

• Pushing data while downloading to ffmpeg

  5 avril 2019, par Nguyễn Thành Đạt

  I have try to relivestream video to facebook with source from youtube.

  I use the ytdl to download video from youtube.
  I want to during the video download process, i will livestream

  When i run my source in blow by nodejs then the error appears :

  var url = 'https://www.youtube.com/watch?v=CTL_5dqDOyc';
  
  var ffmpeg = spawn('ffmpeg', ['-re', '-i', 'pipe:0', '-i', 'logo.png',' acodec', 'libmp3lame',  '-ar', '44100', '-b:a', '128k', '-profile:v', 'baseline', '-s', '854x480', '-bufsize', '6000k', '-vcodec', 'libx264', '-preset', 'veryfast', '-g', '30', '-r', '30', '-f', 'flv', 'rpmt link']);
  
  ytdl(url).pipe(ffmpeg.stdin);