Recherche avancée

Sur d’autres sites (8088)

• Slightly wrong color in MP4 videos written by PyAV

  26 septembre 2024, par Yossi Kreinin

  I am writing MP4 video files with the following PyAV-based code (getting input frames represented as numpy arrays - the sort produced by imageio.imread - as input) :

  


  class MP4:
    def __init__(self, fname, width, height, fps):
        self.output = av.open(fname, 'w', format='mp4')
        self.stream = self.output.add_stream('h264', str(fps))
        self.stream.width = width
        self.stream.height = height
        # these 2 lines can be removed and the problem still reproduces:
        self.stream.pix_fmt = 'yuv420p'
        self.stream.options = {'crf': '17'}
    def write_frame(self, pixels):
        frame = av.VideoFrame.from_ndarray(pixels, format='rgb24')
        packet = self.stream.encode(frame)
        self.output.mux(packet)
    def close(self):
        packet = self.stream.encode(None)
        self.output.mux(packet)
        self.output.close()


  


  The colors in the output MP4 video are slightly different (apparently darker) than the colors in the input images :

  


  Screen grab of an image viewer showing an input frame :

  


  

  


  Screen grab of VLC playing the output MP4 video :

  


  

  


  How can this problem be fixed ? I variously fiddled with the frame.colorspace attribute, stream options and VideoFrame.reformat but it changed nothing ; of course I could have been fiddling incorrectly.

  


  As you can see, the input has simple flat color regions, so I doubt it's any sort of compression artifact, eg YUV420 dropping some of the chroma info or other such.

  


• Why i get error when i try to run command play in python script of discord bot

  30 mai 2022, par UNDERTAKER 86

  My code of music discord bot :

  


  import ffmpeg
import asyncio
import discord
from discord.ext import commands
import os
import requests
import random
import json
from replit import db
import youtube_dl
from keep_alive import keep_alive

class music(commands.Cog):
    def __init__(self, client):
        self.client = client

    @commands.command()
    async def join(self, ctx):
        if ctx.author.voice is None:
            await ctx.send(f'{ctx.message.author.mention}, Ты не подключён к голосовому чату!')
        voice_channel = ctx.author.voice.channel
        if ctx.voice_client is None:
            await voice_channel.connect()
        else:
            await ctx.voice_client.move_to(voice_channel)
  
    @commands.command()
    async def leave(self, ctx):
        if ctx.author.voice is None:
            await ctx.send(f'{ctx.message.author.mention}, Ты не подключён к голосовому чату!')
        else:
            await ctx.voice_client.disconnect()
            await ctx.send(f'{ctx.message.author.mention}, Пока!')

    @commands.command()
    async def play(self, ctx, *, url):
        if ctx.author.voice is None:
            await ctx.send(f'{ctx.message.author.mention}, Ты не подключён к голосовому чату!')
        ctx.voice_client.stop()
        ffmpeg_options = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'}
        YDL_OPTIONS = {'format': 'bestaudio/best', 'noplaylist': 'True', 'simulate': 'True',
                       'preferredquality': '32bits', 'preferredcodec': 'wav', 'key': 'FFmpegExtractAudio'}
        vc = ctx.voice_client

        with youtube_dl.YoutubeDL(YDL_OPTIONS) as ydl:
            if 'https://' in url:
                info = ydl.extract_info(url, download=False)
            else:
                info = ydl.extract_info(f'ytsearch:{url}', download=False)['entries'][0]
            url2 = info['formats'][0]['url']
            source = await discord.FFmpegOpusAudio.from_probe(url2, **ffmpeg_options)
            vc.play(source)

    @commands.command()
    async def pause(self, ctx):
        if ctx.author.voice is None:
            await ctx.send(f'{ctx.message.author.mention}, Ты не подключён к голосовому чату!')
            await ctx.voice_client.pause()
            await ctx.send(f'{ctx.message.author.mention}, Пауза')

    @commands.command()
    async def resume(self, ctx):
        if ctx.author.voice is None:
            await ctx.send(f'{ctx.message.author.mention}, Ты не подключён к голосовому чату!')
            await ctx.voice_client.resume()
            await ctx.send(f'{ctx.message.author.mention}, Играет')

#    @commands.command()
 #   async def stop(self, ctx):
  #      await ctx.voice_client.stop()
   #     ctx.send(f'{author.mention}, Остановлен')

#   @commands.command()
 #  async def repeat(self, ctx):
  #    await ctx.voice_client.repeat()
   #   ctx.send(f'{author.mention}, Повтор')

#   @commands.command()
 #  async def loop(self, ctx):
  #    await ctx.voice_client.loop()
   #   ctx.send(f'{author.mention}, Повтор')

keep_alive()
def setup(client):
    client.add_cog(music(client))


  


  But i get error when i write in discord command play :

  


  [youtube] rUd2diUWDyI: Downloading webpage
[youtube] Downloading just video rUd2diUWDyI because of --no-playlist
[youtube] rUd2diUWDyI: Downloading webpage
[youtube] Downloading just video rUd2diUWDyI because of --no-playlist
Ignoring exception in command play:
Traceback (most recent call last):
  File "/home/runner/MBOT/venv/lib/python3.8/site-packages/discord/ext/commands/core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "/home/runner/MBOT/music.py", line 51, in play
    source = await discord.FFmpegOpusAudio.from_probe(url2, **ffmpeg_options)
  File "/home/runner/MBOT/venv/lib/python3.8/site-packages/discord/player.py", line 387, in from_probe
    return cls(source, bitrate=bitrate, codec=codec, **kwargs)
  File "/home/runner/MBOT/venv/lib/python3.8/site-packages/discord/player.py", line 324, in __init__
    super().__init__(source, executable=executable, args=args, **subprocess_kwargs)
  File "/home/runner/MBOT/venv/lib/python3.8/site-packages/discord/player.py", line 138, in __init__
    self._process = self._spawn_process(args, **kwargs)
  File "/home/runner/MBOT/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.


  


  I try install ffmpeg in console python, but this dont helped me. Please, give me answer on my question. I use service replit.com to coding on python. Because i want to install this script on server. How i can solve this problem ?

  


• FFMPEG command to mux video stream into HLS fMP4

  16 décembre 2020, par LinuxVirgin

  I have been trying to display my IP Cameras output onto a webpage to be viewed on a iThing (ipad or iphone)

  


  Im diplaying the output below in a video tag like below

  


  <video class="video-js vjs-default-skin" width="400" height="300" controls="controls">&#xA;       <source type="application/x-mpegURL" src="http://127.0.0.1/wordpress/prog_index.m3u8">&#xA;</source></video>&#xA;

  


  Im using ffmpeg to mux/convert (I may have my terminology wrong) the cameras http stream (not RTSP stream).

  


  Ive tried multiple commands below and some commands work on a PC/Chrome but none of them work on a ipad/safari or chrome.

  


  All the files are being generated in the correct locations on the webserver to allow them to be diplayed

  


  ffmpeg -i http://username:password@192.168.102.92/ISAPI/Streaming/channels/102/httpPreview  -force_key_frames "expr:gte(t,n_forced*2)" -sc_threshold 0 -s 640x480 -c:v libx264 -b:v 1536k -c:a copy -hls_time 6 -hls_playlist_type vod -hls_segment_type fmp4 -hls_segment_filename "fileSequence%d.m4s" -hls_wrap 3 prog_index.m3u8


  


  ffmpeg -i http://username:password@192.168.102.92/ISAPI/Streaming/channels/102/httpPreview  -force_key_frames "expr:gte(t,n_forced*2)" -sc_threshold 0 -s 640x480 -c:v libx264 -b:v 1536k -c:a copy -hls_time 6 -hls_playlist_type vod -hls_segment_type fmp4 -hls_segment_filename "fileSequence%d.m4s" -hls_list_size 10 prog_index.m3u8


  


  ffmpeg -i http://username:password@192.168.102.92/ISAPI/Streaming/channels/102/httpPreview  -force_key_frames "expr:gte(t,n_forced*2)" -sc_threshold 0 -s 640x480 -b:v 1536k -c:a copy -hls_time 6  -hls_segment_type fmp4 -hls_segment_filename "fileSequence%d.m4s" -hls_list_size 10 prog_index.m3u8


  


  ffmpeg -i http://username:password@192.168.102.92/ISAPI/Streaming/channels/102/httpPreview -force_key_frames "expr:gte(t,n_forced*2)" -sc_threshold 0 -s 640x480 -b:v 1536k -c:a copy -hls_time 3 -hls_flags delete_segments -hls_segment_type fmp4 -hls_segment_filename "fileSequence%d.m4s" prog_index.m3u8


  


  Can someone point out where Im going wrong, I think its the FFMPEG cmd ?