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• Ffmpeg gdigrab records black window when capturing graphics-intensive flight simulator

  23 mars 2021, par iter

  I am trying to capture video from XPlane, a popular flight simulator. I'm running on Windows.

  



  Normally, I can capture individual windows using gdigrab, but when I use it on an XPlane window like so...

  



  ffmpeg -f gdigrab -framerate 30 -i "X-System" -b:v 300K capture.mp4


  



  ...I get a video file that's the right dimensions but is all black. I imagine this may have something to do with how XPlane talks directly to the GPU. I should add that if I capture the entire desktop like so...

  



  ffmpeg -f gdigrab -framerate 30 -i desktop -b:v 300K capture.mp4


  



  ...I get everything including the simulator window, but naturally with unrelated windows in the capture, including windows sitting on top of the simulator window.

  



  Is there a way for gdigrab to capture video this GPU-intensive window alone ? Is there a different tool I can use ?

  


• How to correctly detect window with xdotool in bash script

  24 mai 2020, par wasd

  I'm trying to record screen and also input from my webcam. To show image from a webcam I use ffplay. However I want it to be placed in a specific location of my screen. To do so I use xdotool and following bash script :

  



   #!/bin/bash                                                                                                                                                                                                                                   
 ffplay -i /dev/video0 &                                                                                                                                                                                       
 res=$!                                                                                                                  
 echo $res                                                                                                               
 window_pid=$(xdotool search --pid $res)                                                                                       
 echo $window_pid
 xdotool windowmove $window_pid 1200 200                                                                                                       
 wait


  



  For some reason I get correct process id res but nothing for the window_pid. If I run similar commands in terminal it works correctly (I run ffplay in one terminal instance and the rest of commands in another). What am I missing here ?

  


• Why does this ffmpeg,exe window keep opening when I run my command ?

  5 avril 2020, par John

  I'm making a discord bot and for this aspect of the bot, I wanted it to play music in the voice channel. Here is my code for it :

  



  @client.command(pass_context=True)
async def play(ctx, url: str):

    song_there = os.path.isfile("song.mp3")
    try:
        if song_there:
            os.remove("song.mp3")
            print("Removed old song file")
    except PermissionError:

        await ctx.send("`There's already a song playing, request your song after!`")
        return

    await ctx.send("`Getting your song ready...`")

    voice = get(client.voice_clients, guild=ctx.guild)

    ydl_opts = {
        'format': 'bestaudio/best',
        'postprocessors': [{
            'key': 'FFmpegExtractAudio',
            'preferredcodec': 'mp3',
            'preferredquality': '192',
        }],
    }

    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        try:
            print("Downloading audio now\n")
            ydl.download([url])
        except:
            await ctx.send("`Error, that was not a valid url.`")
            return

    for file in os.listdir("./"):
        if file.endswith(".mp3"):
            name = file
            os.rename(file, "song.mp3")

    voice.play(discord.FFmpegPCMAudio("song.mp3"), after=lambda e: print("Song done!"))
    await ctx.send("`Everything went well. Enjoy!`")
    voice.source = discord.PCMVolumeTransformer(voice.source)
    voice.source.volume = 0.07

    nname = name.rsplit("-", 2)
    await ctx.send(f"`Playing: {nname[0]}`")
    print("playing\n")


  



  I got most of it from online sources to be honest. However, whenever someone plays a song, this pops up throughout the song download process. It can be seen here : https://imgur.com/a/iRr0qwj

  



  I don't mind them coming up, but when they do, they override all of my other tabs and pop up so they're the main screen. I'd like for them to pop up in the background, if I can't remove them fully. Can anyone help ? This would be pretty unpractical for me for when multiple use the function, and I can't use my computer anymore (as of now the bot is ran on my computer) without constantly minimizing that screen.

  



  I'm using windows 10, Python 3.7