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• Proprietary codecs on Linux. What is legal ?

  17 octobre 2016, par George Eco

  So, assuming we got a distribution without proprietary codecs installed.
  Let’s take Linux Mint for example. I want to store and playback wav and ogg format sounds, either by using my own software, or by using another developer’s software. So far so good right ?

  Imagine now that we have the following scenario. For some reason, I wanna playback a file that is either an mp4 or mp3 or mpeg or any other format, made by proprietary codecs. Instantly, I will need a codec for these formats.

  I read somewhere that Fluendo sells solutions for "legal codec usage" for linux distros.
  URL of fluendo : http://www.fluendo.com/en/

  So here comes the questions :

  Using VLC and ffmpeg is enough for me to convert a file to an ogg or ogv so I can playback a song or a video using an open format. You can also playback playback files made by proprietary formats. But are VLC and ffmpeg legal to use, to playback such files made by proprietary codecs ? For example, ss VLC codecs okay to be used without paying anyone for mp4 playback ? Is it okay to convert a file from mp4 to ogv ?
  If not, are there any legal and open source and free (as in freedom) codecs around that can solve the issue, or does someone have to pay a product, to be ethically correct, to the developers of the proprietaty codecs ?

  Note that I do not ask for Windows, since codec licenses are included to the price of the operating system. I ask exclusively for a free linux distribution.

• ffmpeg slideshow coding errors [closed]

  22 juin 2022, par pentrell

  I'm trying to make an ffmpeg slideshow. I want it to include 'original_aspect_ratio' and each jpg must 'crossfade'. The following code partially works but the first 2 images don't display properly.
What is wrong with my coding please ? :-

  


  FFMPEG SLIDESHOW

  


  ffmpeg
  
-loop 1 -t 5 -i Image1.jpg
  
-loop 1 -t 5 -i Image2.jpg
  
-loop 1 -t 5 -i Image3.jpg
  
-loop 1 -t 5 -i Image4.jpg
  
-loop 1 -t 5 -i Image5.jpg
  
-i Song.mp3
  
-filter_complex
  
"[1:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720 :(ow-iw)/2 :(oh-ih)/2,setsar=1,format=yuva444p,fade=d=1:t=in:alpha=1,setpts=PTS-STARTPTS+4/TB[f0] ;
  
[2:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720 :(ow-iw)/2 :(oh-ih)/2,setsar=1,format=yuva444p,fade=d=1:t=in:alpha=1,setpts=PTS-STARTPTS+8/TB[f1] ;
  
[3:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720 :(ow-iw)/2 :(oh-ih)/2,setsar=1,format=yuva444p,fade=d=1:t=in:alpha=1,setpts=PTS-STARTPTS+12/TB[f2] ;
  
[4:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720 :(ow-iw)/2 :(oh-ih)/2,setsar=1,format=yuva444p,fade=d=1:t=in:alpha=1,setpts=PTS-STARTPTS+16/TB[f3] ;
  
[f0]overlay[bg1] ;[bg1][f1]overlay[bg2] ;[bg2][f2]overlay[bg3] ;
  
[bg3][f3]overlay,format=yuv420p[v]" -map "[v]" -map 5:a -shortest -movflags +faststart Output.mp4

  


• FFmpeg doesn't play any audio through Discord.py BOT

  12 mai 2019, par Lewis H

  Here is my code for my Discord bot’s play function :

  @bot.command()
  
  async def play(ctx, url:str = None): # DOESN'T WORK, DOWNLOADS BUT DOESN'T PLAY
  
  
  
          ...
  
  
  
          ytdl_options = {
  
              'format': 'bestaudio/best',
  
              'postprocessors': [{
  
                  'key': 'FFmpegExtractAudio',
  
                  'preferredcodec': 'mp3',
  
                  'preferredquality': '192',
  
              }],
  
          }
  
          ytdl = youtube_dl.YoutubeDL(ytdl_options)
  
  
  
          loop = asyncio.get_event_loop()
  
          data = await loop.run_in_executor(None, lambda: ytdl.extract_info(url))
  
  
  
  
  
          if 'entries' in data:
  
              data = data['entries'][0] # taking top item from a YT playlist
  
  
  
          source = ytdl.prepare_filename(data)
  
  
  
          vc.play(discord.FFmpegPCMAudio(source)) #play audio
  
          print(vc.is_playing())
  
          await ctx.send("Now playing: " + data.get('title')) #now playing
  
          asyncio.sleep(3)
  
          print(vc.is_playing())

  When I call the function, it runs fine and downloads the video from youtube-dl, then sends the message "Now playing : X", but doesn’t play any audio.

  I added the two print(vc.is_playing()) lines and what is returned in the shell is :

  True
  
  False

  So clearly it tries to play the song but immediately fails.

  There are no exceptions thrown, so I can’t understand why FFmpeg doesn’t want to play the audio.