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• How to access compressed stream from webcam with ffmpeg

  17 octobre 2014, par grzebyk

  I want to stream webcam live with ffmpeg. My Logitech c920 webcam has an output stream of raw and compressed data. The command ffmpeg -f v4l2 -list_formats all -i /dev/video1 produces the following console output :

  [video4linux2,v4l2 @ 0x26709e0] Raw       :   yuyv422 :     YUV 4:2:2 (YUYV) : 640x480 160x90 160x120 176x144 320x180 320x240 352x288 432x240 640x360 800x448 800x600 864x480 960x720 1024x576 1280x720 1600x896 1920x1080 2304x1296 2304x1536
  
  [video4linux2,v4l2 @ 0x26709e0] Compressed:      h264 :                H.264 : 640x480 160x90 160x120 176x144 320x180 320x240 352x288 432x240 640x360 800x448 800x600 864x480 960x720 1024x576 1280x720 1600x896 1920x1080
  
  [video4linux2,v4l2 @ 0x26709e0] Compressed:     mjpeg :                MJPEG : 640x480 160x90 160x120 176x144 320x180 320x240 352x288 432x240 640x360 800x448 800x600 864x480 960x720 1024x576 1280x720 1600x896 1920x1080

  I would like to copy compressed h264 image and send it to ffserver.

  When I use this command ffmpeg -r 25 -f v4l2 -i /dev/video0 -c:v libx264 -b:v 2500k http://localhost:8090/feed1.ffm program gets the raw data and transcode it with h264 codec.

  When I change the -c:v libx264 to -c:v copy I get an error because ffmpeg tries to copy raw camera image.

  How can I access h264 compressed image and send it to server ?

• How do i get access to subproccess.py ?

  6 décembre 2023, par Kronik71

  So, my bot for some reason wants to access a folder in \WindowsApps\PythonSoftwareFoundation.Python.bunch_of_numbers\Lib called subproccess.py but it always gives the error : PermissionError: [WinError 5] Access is denied. I think it has to do with ffmpeg.

  


  Here's the full traceback (kinda long) :

  


  Traceback (most recent call last):
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\interactions\client\client.py", line 1900, in __dispatch_interaction
    response = await callback
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\interactions\client\client.py", line 1771, in _run_slash_command
    return await command(ctx, **ctx.kwargs)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\interactions\models\internal\command.py", line 132, in __call__
    await self.call_callback(self.callback, context)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\interactions\models\internal\application_commands.py", line 802, in call_callback
    return await self.call_with_binding(callback, ctx)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\interactions\models\internal\callback.py", line 43, in call_with_binding
    return await callback(*args, **kwargs)
  File "C:\Users\myuser\OneDrive\Desktop\button.py", line 38, in press
    voice_client.play(discord.FFmpegPCMAudio(executable=r"C:\Users\myuser\OneDrive\Desktop\ffmpeg-6.1-essentials_build\bin", source=audiosource))
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.Bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\discord\player.py", line 290, in __init__
    super().__init__(source, executable=executable, args=args, **subprocess_kwargs)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\discord\player.py", line 166, in __init__
    self._process = self._spawn_process(args, **kwargs)
  File "C:\Users\myuser\AppData\Local\Packages\PythonSoftwareFoundation.Python.bunch_of_numbers\LocalCache\local-packages\Python310\site-packages\discord\player.py", line 180, in _spawn_process
    process = subprocess.Popen(args, creationflags=CREATE_NO_WINDOW, **subprocess_kwargs)
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.bunch_of_numbers\lib\subprocess.py", line 971, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.bunch_of_numbers\lib\subprocess.py", line 1456, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
PermissionError: [WinError 5] Access is denied


  


  heres my code :

  


  import interactions
import discord
from discord import FFmpegPCMAudio
import tracemalloc

ffmpegexec = r"C:\Users\myuser\OneDrive\Desktop\ffmpeg-6.1-essentials_build\bin\ffmpeg.exe"

audiosource = r"C:\Users\myuser\Downloads\seatbelt-online-audio-converter.mp3"

source = discord.FFmpegPCMAudio(audiosource)

token = "my_token"

bot = interactions.Client(token=token)

tracemalloc.start()

@interactions.slash_command(
    name="joinvc",
    description="starts the game"
)

async def joinvc(ctx: interactions.ComponentContext):
    await ctx.send("Joining vc. Please make sure you are currently in a vc!")
    vc = ctx.author.voice.channel
    await vc.connect()

@interactions.slash_command(
    name="press",
    description="Press the button"
)

async def press(ctx: interactions.ComponentContext):
    await ctx.send(f"{ctx.author.mention} has pressed the button")
    vc = ctx.author.voice.channel
    voice_client = await vc.connect()  # Connect to the voice channel

voice_client.play(discord.FFmpegPCMAudio(executable=r"C:\Users\myuser\OneDrive\Desktop\ffmpeg-6.1-essentials_build\bin", source=audiosource))


bot.start(token)


  


• matroskadec : prevent access of elements after freeing

  25 novembre 2016, par Michael Schenk

  matroskadec : prevent access of elements after freeing
  Using the decode interrupt feature of ffmpeg may cause crashes by
  
  accessing previously freed pointers in matroska_read_close.
  To prevent this reset nb_elem to zero after freeing the elements,
  
  because ffmpeg normally tests for nb_elem.
  Signed-off-by : Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
  

  • [DH] libavformat/matroskadec.c