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• Surfaceview for subtitles alpha does not work

  27 mai 2018, par user654628

  Goal : trying to build video player with subtitles for android. Video can be low resolution but the subtitles should be resolution of phone (such that if video is 720p, the subtitles should render to screen size say 1080p).

  Issue : I am using FFMPEG to render a frame at say 720p but phone device is 1080p. I need to display subtitles that are different resolution than the subtitles resolution so pixel blending is difficult.

  I first tried to scale the frame (AVFrame) with sws_convert but each frame took 80ms so that is not an option (since it is running software).

  Then I tried two surface views, one for the video and one for subtitles where video would be 720p and subtitles SurfaceView is 1080p, then the video scales up to the phone size. The issue here is that the subtitles are not translucent. Black opacity 0 would be transparent but white with alpha 0 is still white. Why is this ?

  //Code from Java, the view that extends FrameLayout
  
  public VideoView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
  
      super(context, attrs, defStyleAttr);
  
      mVideoSurface = new SurfaceView(context);
  
      mSubtitlesSurface = new SurfaceView(context);
  
      addView(mVideoSurface);
  
      addView(mSubtitlesSurface);
  
      mVideoSurface.getHolder().addCallback(mSurfaceCallback);
  
      mSubtitlesSurface.getHolder().addCallback(mSurfaceCallback);
  
      mSubtitlesSurface.setZOrderMediaOverlay(true);
  
      mSubtitlesSurface.getHolder().setFormat(PixelFormat.TRANSLUCENT);
  
      //etc
  
  }

  Eventually I tried as a test to render a square to the subtitle surface view (C++)

  // Render the video frame, now render the subtitle frame
  
  ANativeWindow_Buffer buffer;
  
  ANativeWindow_setBuffersGeometry(subWindow, width, height, WINDOW_FORMAT_RGBA_8888);
  
  if ((ret = ANativeWindow_lock(subWindow, &buffer, NULL)) < 0) {
  
      return ret;
  
  }
  
  for (int j = height/2; j < height/2 + 100; j++) {
  
      for (int i = width/2; i < width/2 + 100; i++) {
  
          uint8_t * d =  (uint8_t*)buffer.bits + j * (buffer.stride * 4) + i * 4;
  
          d[0] = 0xff;
  
          d[1] = 0xff;
  
          d[2] = 0xFF;
  
          d[3] = 0;           /* alpha */
  
  
  
      }
  
  }
  
  ANativeWindow_unlockAndPost(subWindow);

  So above code should render a white square in the image with 0 alpha (so should be invisible), but it is shown. If I change it to yellow with alpha 0 it will be visible but not the correct color. If I change to white with 1 alpha, it is white and opaque. If I use black with alpha 0xCC, it is invisible, only if alpha is 0xFF then it is visible as black. Seems to have no translucency even though I added it to the SurfaceHolder. Why is it like this ? I can add more code if needed.

  Is my only option to do what I want to render frame as a texture in OpenGL and (GLSurfaceView), resize the image to phone resolution and blend the alpha subtitles onto the frame as a texture ?

  Thanks in advance.

• ffmpeg on replit (discord audio player)

  11 mai 2022, par mohammad5615

  im trying to make discord audio file player on Replit but i cant install ffmpeg

  


  my bot source

  


  import discord
import discord.ext
from time import sleep
import os
import ffmpeg
import replit
#from keep_alive import keep_alive


client = discord.Client()


@client.event
async def on_ready():
  channel = client.get_channel(714375630233403442)
  voice = await channel.connect()

  
  voice.play(discord.FFmpegPCMAudio('song.mp3'))
  print('Done')

#keep_alive()

client.run(os.getenv('TOKEN'))


input('Press Enter to Exit (5):')
input('Press Enter to Exit (4):')
input('Press Enter to Exit (3):')
input('Press Enter to Exit (2):')
input('Press Enter to Exit (1):')


  


  The cod image

  


  i run this cod on replit and i get this error

  


  Ignoring exception in on_ready
Traceback (most recent call last):
  File "/home/runner/Discord-Bot-2/venv/lib/python3.8/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "main.py", line 19, in on_ready
    voice.play(discord.FFmpegPCMAudio('song.mp3'))
  File "/home/runner/Discord-Bot-2/venv/lib/python3.8/site-packages/discord/player.py", line 225, in __init__
    super().__init__(source, executable=executable, args=args, **subprocess_kwargs)
  File "/home/runner/Discord-Bot-2/venv/lib/python3.8/site-packages/discord/player.py", line 138, in __init__
    self._process = self._spawn_process(args, **kwargs)
  File "/home/runner/Discord-Bot-2/venv/lib/python3.8/site-packages/discord/player.py", line 147, in _spawn_process
    raise ClientException(executable + ' was not found.') from None
discord.errors.ClientException: ffmpeg was not found.


  


  The error cod image (cant find ffmpeg)

  


• My music doesn't play correctly and other problems - Discord.py

  24 mars 2021, par Diacono

  So, I'm triying to let my bot play songs directly from the url (without downloading them like the song.mp3 method) but I'm having a hard time. The bot plays only 1 song and when I try to play another song it doesn't play it.
I'm also getting 2 errors : video_link is not defined and self is not defined.
Also when I try to play live music like "lofi hip hop radio - beats to relax/study to" nothing happens.
Can you help me please ???

  


  This is my code

  


  import asyncio
import discord
from discord.ext import commands, tasks
import requests
import json
from random import choice
from discord.utils import get
from discord import FFmpegPCMAudio
import youtube_dl
bot = commands.Bot(command_prefix="!")



ytdl_format_options = {
    'format': 'bestaudio/best',
    'outtmpl': '%(extractor)s-%(id)s-%(title)s.%(ext)s',
    'restrictfilenames': True,
    'noplaylist': True,
    'nocheckcertificate': True,
    'ignoreerrors': False,
    'logtostderr': False,
    'quiet': True,
    'no_warnings': True,
    'default_search': 'auto',
    'source_address': '0.0.0.0' # bind to ipv4 since ipv6 addresses cause issues sometimes
}

ffmpeg_options = {
    'options': '-vn'
}

ytdl = youtube_dl.YoutubeDL(ytdl_format_options)

class YTDLSource(discord.PCMVolumeTransformer):
    def __init__(self, source, *, data, volume=0.5):
        super().__init__(source, volume)

        self.data = data

        self.title = data.get('title')
        self.url = data.get('url')

    @classmethod
    async def from_url(cls, url, *, loop=None, stream=False):
        loop = loop or asyncio.get_event_loop()
        data = await loop.run_in_executor(None, lambda: ytdl.extract_info(url, download= not stream))

        if 'entries' in data:
            data = data['entries'][0]

        filename = data['url'] if stream else ytdl.prepare_filename(data)
        return cls(discord.FFmpegPCMAudio(filename, **ffmpeg_options), data=data)


@bot.command()
async def play(ctx, url):
    voice = await ctx.author.voice.channel.connect()
    player = await YTDLSource.from_url(url, loop=client.loop)
    ctx.voice_client.play(player, after=lambda e: print('Player error: %s' % e) if e else None)
    ydl_opts = {'format': 'bestaudio'}
    FFMPEG_OPTIONS = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'}
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
         info = ydl.extract_info(video_link, download=False)
         URL = info['formats'][0]['url']
    voice = get(self.bot.voice_clients, guild=ctx.guild)
    voice.play(discord.FFmpegPCMAudio(URL, **FFMPEG_OPTIONS))