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• Ffmpeg : How to transition 2 videos together with a custom alpha channel video

  9 janvier 2023, par Daniel Enrico Botta

  I have these files :

  


  

  • 1.mp4, 2.mp4 (video files)

  


  • wipe.mov (alpha channel wipe)

  


  


  I want to use the wipe.mov as a transition between 1.mp4 and 2.mp4
The wipe.mov should replicate the same feeling as the xfade=transition=wipeleft with the only difference that it should use wipe.mov as input

  


  I have tried to use alphaextract to extract the alphachannel from the wipe.mov and this seems to work well.

  


  The problem is I can't figure out how to overlay and make transparent the correct portions in order to make this.

  


  Unfortunately xfade does not accept a video as input... I had tried something like this :

  


  ffmpeg -y -hide_banner -i 1.mp4 -i 2.mp4 -i wipe.mov -filter_complex \ "[0:v]settb=AVTB,setpts=PTS-STARTPT[v0];[1:v]settb=AVTB,setpts=PTS-STARTPTS\[v1]; \ [v1]scale=1280x720,format=yuva420p,alphaextract[alpha]; \ [v0][alpha]xfade=transition=custom:duration=1[out]" -map "[out]" output.mp4

  


  Does anyone know a way to make this work ?

  


  I have also been looking into lumakey...

  


  UPDATE :

  


  this is what I want to achieve :

  


  https://drive.google.com/file/d/1fBu3bVmtbu5DtxEWAzADRmoVCeCg—tD/view?usp=share_link

  


  this is the wipe.mov :

  


  https://drive.google.com/file/d/1z83chzDe0Iw-oTEduWXBpueIAoZezODD/view?usp=share_link

  


• ffmpeg - Overlay webm video (with alpha channel) over a static background image

  24 février 2023, par Aran

  I'm trying to overlay a webm video over an image. The video has opacity where the image should show through. All my attempts to do this via ffmpeg so far have shown the image in the first frame, then cut to the video only where the alpha part shows black (image behind is not visible).

  


  The resolutions of the overlay and background image are both the same (1920x1080).

  


  The closest command I've had was this however all transparency is lost and you just see the background image :

  


  ffmpeg -y \
  -i transparent_overlay_video.webm \
  -i background_image.png \
  -filter_complex "[0:v]format=argb,geq=r='r(X,Y)':a='1.0*alpha(X,Y)'[zork]; \
  [1:v][zork]overlay" \
  -vcodec libx264 outputvideo.mp4


  


  Solution

  


  ffmpeg -y \
  -c:v libvpx \
  -i transparent_overlay_video.webm \
  -i background_image.png \
  -filter_complex "[0:v]format=argb,geq=r='r(X,Y)':a='1.0*alpha(X,Y)'[zork]; \
  [1:v][zork]overlay" \
  -vcodec libx264 outputvideo.mp4


  


  Thanks to Баяр-Гончикжапов below for the solution

  


• FFmpeg doesn't play audio, yet no error shown

  4 août 2023, par Kristupas

  So i'm learning Python and don't know much about FFmpeg. I am following a tutorial, which explains everything very clearly. Everything is working, with one exception. Whenever I try to get it to play a sound, it won't.. Here's what it is saying :

  


  INFO     discord.player ffmpeg process 2540 successfully terminated with return code of 1.

  


  And here's my code (forgive me for all of the childish things in there, i'm just trying out different features) :

  


  
import discord
import discord.ext
from discord import FFmpegPCMAudio
from discord.ext import commands
import random


Token = "No token for you :)"
client = commands.Bot(command_prefix = '!', intents=discord.Intents.all())


@client.event
async def on_ready():
    print(f"we're rolling as {client.user} \n")
    channel = client.get_channel(1022535885851459727)
    await channel.send("Tremble before my might hoomans😤😤")

#Member events:

@client.event
async def on_member_join(member):
    await member.send("Ok comrade, welcome to bot lab, pls not leave. Anways here rules \n1. No swearing \n2. No cursing \n3. No bullying, the owner is a crybaby \n4. No following the rules (u get banned if this one is broken)")
    channel = client.get_channel(1136658873688801302)
    jokes = [f"A failure known as {member} has joined this chat!", 
             f"Another {member} has joined the channel", 
             f"A {member} spawned", 
             f'cout << "{member} has joined teh chat" << endl;', 
             f"OUR great {member} has come to save us" ]
    await channel.send(jokes[random.randint(0,len(jokes))])

@client.event 
async def on_member_remove(member):
    await member.send("Bye our dear comrade")
    channel = client.get_channel(1136663317738442752)
    await channel.send(f"{member} has left the chat :(.)")

#Client commands:
    
@client.command()
async def hello(ctx):
    await ctx.send("Hello, I am pro bot")

@client.command()
async def byelol(ctx):
    await ctx.send("Bye, I am pro bot")
@client.command()
async def ping(ctx):
    await ctx.send(f"**pong** {ctx.message.author.mention}")


@client.event
async def on_message(message):
    message.content = message.content.lower()
    await client.process_commands(message)


#voice channel commands:

@client.command(pass_context = True)
async def micup(ctx):
    if (ctx.author.voice):
        await ctx.send(f"Joining on {ctx.message.author}'s command")
        channel = ctx.message.author.voice.channel
        voice = await channel.connect()
        source = FFmpegPCMAudio('Bluetooth.wav')
        player = voice.play(source)
        
        
        
    else:
        await ctx.send("No.")



@client.command(pass_Context = True)
async def leave(ctx):
    if (ctx.voice_client):
        await ctx.send(f"Leaving on {ctx.message.author}'s command")
        await ctx.guild.voice_client.disconnect()
    else:
        await ctx.send("Nyet. Im not in voice chat u stoopid hooman")


@client.command(pass_Context = True)
async def pause(ctx):
    voice = discord.utils.get(client.voice_clients, guild = ctx.guild)
    if voice.is_playing():
        await ctx.send("Pausing..⏸")
        voice.pause()
    else:
        await ctx.send("I don't think I will.")

@client.command(pass_Context = True)
async def resume(ctx):
    voice = discord.utils.get(client.voice_clients, guild = ctx.guild)
    if voice.is_paused():
        await ctx.send("My ears are bleeding")
        voice.resume()
    else:
        await ctx.send("ALREADY BLASTING MUSIC")

@client.command(pass_Context = True)
async def stop(ctx):
    voice = discord.utils.get(client.voice_clients, guild = ctx.guild)
    await ctx.send("You can stop the song, but you can't stop me!")
    voice.stop()

@client.command(pass_Context = True)
async def play(ctx, arg):
    await ctx.send("Playing..")
    voice = ctx.guild.voice_client
    source = FFmpegPCMAudio(arg)
    player = voice.play(source)

if '__main__' == __name__:
    client.run(Token)


  


  I tried installing different versions of ffmpeg, still nothing. I tried to run the code outside of my venv, but still nothing (i doubt that it's the problem). I changed the path to it to different folders, still nothing.
The only time it DID work is when i entered a full path, but then when you want to play something, you wouldn't want to say " !play D:_Python\DiscordBot\Bluetooth.wav". From what i've seen, it's possible to play it by just saying " !play Bluetooth.wav".

  


  So long story short : I want to make it so that the path i have to specify is just the file name. And when I do, it doesn't play the sound.
(sorry if this is a dupe question, i just couldn't find anything understandable for my amateur brain)