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• FFmpeg - convert 2 audio tracks from video to 5.1 audio, (play video with different languages to different devices) [closed]

  10 février, par Sandre

  How to watch a movie with one language playing through the speakers and another through the headphones ?

  


  Disclaimer : I know nothing about audio conversion, and don't want to study ffmpeg. I spend a few hours searching how to do, actually much more than I want. I found a bunch of questions from different people and not a single working solution, so I made a clunky but working solution. If someone helps me make it more elegant, I'll be happy. If my question just gets downvoted like most ffmpeg newbie questions, it probably deserves it. And I hope my question can help people who want enjoy video with 2 different languages.

  


  A clumsy but working solution.

  


  


  1. Setup Aggregate Audio Device to play 2 channels of 5.1 through speakers and 2 through bluetooth headphones. (On screenshot Audio MIDI Setup for MacOS)


     


  


  2. Use ffmpeg to convert 2 audio tracks into 5.1 audio.

     


  


  3. Play video with new external audio track.

     


  


  


  # print list of channels
ffprobe INPUT.mkv 2>&1 >/dev/null | grep Stream

--- sample output ---
    Stream #0:0(eng): Video: h264 (High), yuv420p(progressive), 1280x544, SAR 1:1 DAR 40:17, 23.98 fps, 23.98 tbr, 1k tbn (default)
    Stream #0:1(rus): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s (default)
    Stream #0:2(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 640 kb/s

# extract audio
ffmpeg -i INPUT.mkv -map 0:1 -acodec copy ru.ac3
ffmpeg -i INPUT.mkv -map 0:2 -acodec copy en.ac3

# extract only front_center channel from 5.1 - speach
ffmpeg -i en.ac3 -filter_complex "channelsplit=channel_layout=5.1:channels=FC[center]" -map "[center]" en_front_center.wav
ffmpeg -i ru.ac3 -filter_complex "channelsplit=channel_layout=5.1:channels=FC[center]" -map "[center]" ru_front_center.wav

# join to 5.1
ffmpeg -i en_front_center.wav -i ru_front_center.wav -filter_complex "[0:a][0:a][0:a][0:a][1:a][1:a]join=inputs=6:channel_layout=5.1[a]" -map "[a]" output.wav


  


  Is it possible to avoid re-encoding the audio and copying the same channel many times to reduce the file size ?

  


• Multimedia Exploration Journal : The Past Doesn’t Die

  12 juillet 2011, par Multimedia Mike — Game Hacking

  New haul of games, new (old) multimedia formats.

  Lords of Midnight
  Check out the box copy scan for Lords of Midnight in MobyGames. In particular, I’d like to call your attention to this little blurb :

  
  
  

  Ahem, "Journey through an immense world — the equivalent of 8 CD-ROMs." Yet, when I procured the game, it only came on a single CD-ROM. It’s definitely a CD-ROM (says so on the disc) and, coming from 1995, certainly predates the earliest DVD-ROMs (which can easily store 8 CD-ROMs on a disc). Thus, I wanted to jump in a see if they were using some phenomenal compression in order to squeeze so much info into 600 or so megabytes.

  I was surprised to see the contents of the disc clocking in at just under 40 megabytes. An intro movie and an outro movie account for 75% of that. Format ? None other than that curious ASCII anomaly, ARMovie/RPL with Escape 122 codec data.

  Cyclemania

  
  
  

  Cyclemania is one of those FMV backdrop action games, but with a motorcycle theme. I had a good feeling I would find some odd multimedia artifacts here and the game didn’t disappoint. The videos are apparently handled using 3-4 discrete files per animation. I’ve documented my cursory guesses and linked some samples at the new MultimediaWiki page.

  Interplay ACMP
  This is unrelated to this particular acquistion, but I was contacted today about audio files harvested from the 1993 DOS game Star Trek : Judgment Rites. The files begin with the ASCII signature "Interplay ACMP Data". This reminds me of Interplay MVE files which begin with the similar string "Interplay MVE File". My theory is that these files use the ACOMP compression format, though I’m still trying to make it fit.

  Wiki and samples are available as usual if you’d like to add your own research.

• How do I make ffmpeg not open a window when used in Python (Discord Bot Youtube Audio Player Pytube)

  20 juin 2019, par Brandalf

  I am using pytube to create a Discord bot that gets audio from a YouTube video and plays it in the voice channel using the code below. The code works perfectly fine and does what I want which is playing audio from YouTube with a link. The issue is that it uses ffmpeg and when it does, it opens the ffmpeg.exe window. Having a window constantly pop up on my screen is kind of annoying but what’s worse is that if I am playing a game in full screen, when ffmpeg is run, it will tab out of my game. So I’m wondering if there is a way to prevent ffmpeg from opening the window or if there is an alternative to playing youtube audio in Discord with a bot that doesn’t use ffmpeg.

  user=ctx.message.author
  
  voice_channel=user.voice.voice_channel
  
  vc = await client.join_voice_channel(voice_channel)
  
  player = await vc.create_ytdl_player(videoLink)
  
  video = pafy.new(videoLink) #runs ffmpeg
  
  player.start()