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• Read partial H.264 stream (starting at random position) and convert to MP4

  27 mars 2020, par Ercksen

  I need to capture a live stream using raspivid on the Raspberry Pi and deliver this stream to multiple players using HTTP. Each player gets is own ffmpeg instance to individually adjust the video parameters.

  Currently, a single raspivid instance writes it’s output into a common ring buffer and any client connected via HTTP reads the buffer.

  This works fine for the first time, because this is when raspivid starts. I think that important control frames are written when the raw H.264 stream starts. But when a HTTP client connects later, it’s ffmpeg instance will receive the H.264 stream at a random position. This will cause ffmpeg to abort with the message pipe:: Invalid data found when processing input.

  Is there any way to start reading at a random position ?

• Command raised an exception : NameError : name 'player' is not defined

  20 mars 2023, par baartys

  I finally got myself a hosting for my project, but got into an error and I don't know how to resolve it.
I ran command !play to start streaming in vc, but I got this error :

  


  2023-03-19 18:36:04 INFO     discord.client logging in using static token
2023-03-19 18:36:04 INFO     discord.gateway Shard ID None has connected to Gateway (Session ID: f983009c9f2881b87ee119278692efc9).
Eurobeat Radio is running!
2023-03-19 18:36:10 ERROR    discord.ext.commands.bot Ignoring exception in command play
Traceback (most recent call last):
  File "/home/container/.local/lib/python3.10/site-packages/discord/ext/commands/core.py", line 229, in wrapped
    ret = await coro(*args, **kwargs)
  File "/home/container/radio.py", line 44, in play
    player.play(FFmpegPCMAudio('http://stream.eurobeat.xyz'))
NameError: name 'player' is not defined
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/home/container/.local/lib/python3.10/site-packages/discord/ext/commands/bot.py", line 1350, in invoke
    await ctx.command.invoke(ctx)
  File "/home/container/.local/lib/python3.10/site-packages/discord/ext/commands/core.py", line 1023, in invoke
    await injected(*ctx.args, **ctx.kwargs)  # type: ignore
  File "/home/container/.local/lib/python3.10/site-packages/discord/ext/commands/core.py", line 238, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: NameError: name 'player' is not defined


  


  I tried running it on my pc and that was without error, but once it was on the hosting it ran in to the error up the page.

  


  Here is the code :

  


  import discord
import urllib.request, json 
from discord import FFmpegPCMAudio
from discord.ext import commands
from discord.ext import tasks
client= commands.Bot(command_prefix="er!", intents=discord.Intents.all(), help_command=None)

@tasks.loop(seconds=10.0)
async def my_background_task():
    """Will loop every 60 seconds and change the bots presence"""
    with urllib.request.urlopen('https://api.laut.fm/station/eurobeat/current_song') as url:
        data = json.load(url)
        global namestatus
        global artiststatus
        namestatus = data['title']
        artiststatus = data['artist']['name']
    await client.change_presence(activity=discord.Activity(type=discord.ActivityType.listening, name="Eurobeat FM"))
    await client.change_presence(activity=discord.Game(name="Para para dancing ~"))
    await client.change_presence(activity=discord.Activity(type=discord.ActivityType.listening, name=f"{namestatus} by {artiststatus}"))


@client.event
async def on_ready():
    print('Eurobeat Radio is running!')
    await client.wait_until_ready()
    my_background_task.start()


@client.event
async def on_voice_state_update(member, prev, cur):
    if client.user in prev.channel.members and len([m for m in prev.channel.members if not m.bot]) == 0:
        channel = discord.utils.get(client.voice_clients, channel=prev.channel)
        await channel.disconnect()

@client.command(aliases=['p', 'pla', 'join', 'j'])
async def play(ctx, url: str = 'http://stream.eurobeat.xyz'): 
    channel = ctx.message.author.voice.channel
    global player
    try:
        player = await channel.connect()
    except:
        pass
    player.play(FFmpegPCMAudio('http://stream.eurobeat.xyz'))
    embedVar = discord.Embed(title="Started Playing!", color=discord.Color.random())
    await ctx.send(embed=embedVar)


  


  Would be very grateful for your help !

  


• Python pipe ffmpeg stream to numpy in realtime

  29 mai 2020, par Dadidum

  im trying to get the frames out of a rtp stream via ffmpeg in realtime in python. At my server the frames are piped from numpy arrays into ffmpeg and should be at the client piped back to numpy for further manipulation. The server creates a sdp file which is given as input to the client. 
It looks like this :

  



  v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 127.0.0.1
t=0 0
a=tool:libavformat 58.42.102
m=video 5004 RTP/AVP 96
b=AS:19000
a=rtpmap:96 H265/90000


  



  With ffplay or VLC the stream can be received but with my python code not, at first needs ca. 5sec for each frame and the image is just some random coloured pixels.
The client :

  



  dimension = '{}x{}'.format(480, 240)
sdf_file = "video.sdp"

command = ['FFMPEG',
           '-protocol_whitelist', 'udp,rtp,file,pipe,crypto,data',
           '-i', sdf_file,
           '-pix_fmt', 'bgr24',
           '-r', '24',
           '-video_size', dimension,
           '-f', 'image2pipe', '-']

size = 480 * 240 * 3
proc = sp.Popen(command, stdout=sp.PIPE)

while True:
    try:
        tic = time.perf_counter()
        frame = proc.stdout.read(size)
        print(frame)
        if frame is None:
            print('no input')
            break
        image = np.frombuffer(frame, dtype='uint8').reshape(240, 480, 3)
        toc = time.perf_counter()
        print(f"performed calc in {(toc - tic) * 1000:0.4f} miliseconds")
        cv2.imshow('received', image)
    except Exception as e:
        print(e)

cv2.destroyAllWindows()
proc.stdin.close()
proc.wait()


  



  Any ideas, how i can get the frames in realtime ? Thanky for your help