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• Resizing 360 stereoscopic video with FFMPEG

  13 mars 2018, par Miriam Tschanen

  I’m trying to prepare a 360 stereoscopic video from our VR app for streaming. We’d like to offer the video in different resolutions to accomodate varying internet speeds. The original file is 3840x2160 and 463MB large.

  I tried using the naive FFMPEG command :
  ffmpeg -i video_3840.mp4 -vf scale=2560:1440 video_2560.mp4

  However, this seems to remove the stereoscopic / 360 properties of the video, at any rate the Windows video player no longer lets me pan around the view and the file size is down to 74MB, which seems a bit extreme.

  Does anyone know which other flags I should set ? Note that I have absolutely no clue about filming or video formats, so I don’t even know what the original file is encoded as. Ideally I’d like to copy over as many settings as possible. The only thing I want to change is the resolution.

  Any help would be greatly appreciated.

• ffmpeg doesn't work, when starting up it doesn't play music, it gives errors

  14 août 2024, par Оля Михеева

  import discord
from discord import FFmpegPCMAudio
import os
import random
from gtts import gTTS
import asyncio

TOKEN="***"
VOICE_CHANNEL_ID=11122224444

class Voice_Bot(discord.Client):
    def __init__(self):
        intents = discord.Intents.default()
        intents.message_content = True
        intents.voice_states=True
        super().__init__(intents=intents)
        print(os.getcwd())
        self.sounds_hello = os.listdir(os.path.join('sounds','hello'))
        self.sounds_bye = os.listdir('sounds\\bye')
        self.sounds = os.listdir('sounds\\nature')

    async def on_ready(self):        
        self.voice_channel = self.get_channel(VOICE_CHANNEL_ID) 
        if self.voice_channel == None:
            print('Не удалось подключиться к голосовому каналу.')
            return
        self.voice_client = await self.voice_channel.connect()
        print('Бот подключен к голосовому каналу')
        await self.text_to_speech("Lets play Guess the Tune")
        
    async def on_message(self,message):
        if message.author==self.user:
            return
        if message.content.startswith("game"):
            await self.text_to_speech("let's start the game guess the melody")
            music=os.listdir("sounds\\music")
            self.melody=random.choice(music)
            await self.play_sound(f"sounds\\music\\{self.melody}")
        elif message.content==self.melody[0:len(self.melody)-4]:
            if (self.voice_client.is_playing()):
                self.voice_client.stop()
            await self.text_to_speech(f"Congratulations, {message.author.name} answered correctly! To continue, type game")
        else:
            if (self.voice_client.is_playing()):
                self.voice_client.stop()
            await self.text_to_speech(f"Unfortunately, {message.author.name} did not guess. To continue, write game")


    async def on_voice_state_update(self,member,before,after):
        if member.id ==self.user.id:
            print('Someone entered or left the voice channel.')
        else:
            try:
                if before.channel == None:
                    print(f'{member.name} entered the voice channel {after.channel}.')
                    await self.play_sound(f'sounds\\hello\\{random.choice(self.sounds_hello)}')
                elif after.channel == None:
                    print(f'{member.name} left the voice channel {before.channel}.')
                    await self.play_sound(f'sounds\\bye\\{random.choice(self.sounds_bye)}')
            except Exception as e:
                print(f"Error in on_voise_state_update: {e}")

    async def text_to_speech(self,text):
        try:
            tts = gTTS(text=text, lang ="en")
            tts.save("text.mp3")
        except Exception as e:
            print(f"Error e: {e}")
        await self.voice_channel.send(text)
        await self.play_sound("text.mp3")

    def play_sound(self,path):
        print(path)
        source=discord.FFmpegPCMAudio(source=path, executable="ffmpeg\\bin\\ffmpeg.exe")
        if (self.voice_client.is_playing()):
            self.voice_client.stop()
        self.voice_client.play(source)                

client = Voice_Bot()
client.run(TOKEN)


  


  [enter image description here](https://i.sstatic.net/ys8Xza0w.jpg)

  


• ffprobe returns coded_picture_number with a frame missing

  26 janvier 2018, par Hélder

  While using ffprobe to get the pict_type and coded_picture_number I noticed while doing a for loop in python that one of the coded_picture_number was missing.

  This is the command used :

  ffprobe foreman.m4v -show_frames | grep -E 'pict_type|coded_picture_number' > output.txt

  And I get returned all frame number with exception of one :

  coded_picture_number=290
  
  pict_type=P
  
  coded_picture_number=289
  
  pict_type=B
  
  coded_picture_number=292
  
  pict_type=P
  
  coded_picture_number=291
  
  pict_type=B
  
  coded_picture_number=294
  
  pict_type=P
  
  coded_picture_number=293
  
  pict_type=B
  
  coded_picture_number=297
  
  pict_type=B
  
  coded_picture_number=296

  The total is 297 coded_picture_number, where does the 295 go ? Does anyone know how to get it ? It causes errors in python when taking ranges and trying to read the image from the data frame.

  If it is possible to have a smooth numbering per pict_type would be perfect. Any clue ?