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• lavc/vvc : Prevent overflow in chroma QP derivation

  9 juin 2024, par Frank Plowman

  lavc/vvc : Prevent overflow in chroma QP derivation
  On the top of p. 112 in VVC (09/2023) :
  It is a requirement of bitstream conformance that the values of
  
  qpInVal[ i ][ j ] and qpOutVal[ i ][ j ] shall be in the range
  
  of −QpBdOffset to 63, inclusive for i in the range of 0 to
  
  numQpTables − 1, inclusive, and j in the range of 0 to
  
  sps_num_points_in_qp_table_minus1[ i ] + 1, inclusive.
  Additionally, don't discard the return code from sps_chroma_qp_table.
  Signed-off-by : Frank Plowman <post@frankplowman.com>
  

  • [DH] libavcodec/vvc/ps.c

• Video Encoded using FFmpeg is not being played in Azure Kinect Viewer

  4 octobre 2023, par Ashutosh Singla

  I captured a video using a Kinect Azure SDK device and extracted the RGB (Color) track using MKVToolNIX. I could playback this RGB track using Azure Kinect Viewer (v.1.4.1). However, when I encode a video using FFmpeg, the command is given below. I can not playback the video using Azure Kinect Viewer. I get a message :

  


  


  Failed to open Recording

  


  


  ffmpeg -i .\RGB.mkv -c:v libx264 -preset veryfast -crf 18 -c:a aac -b:a 128k RGG_Enc.mkv


  


  I tried with different codecs (H.264, H.265, VP9, VP10, MJPEG) and different settings, but could not play the video in Azure Kinect Viewer. Can someone suggest to me what to do ?

  


  Here is the output of the FFprobe for the original video.

  


    C:\Users\Ashutosh\Desktop\RGB_Encoding> ffprobe -i .\RGB.mkv
  ffprobe version 6.0-full_build-www.gyan.dev Copyright (c) 2007- 
 2023 the FFmpeg developers
 built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static -- 
 disable-w32threads --disable-autodetect --enable-fontconfig -- 
 enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp -- 
 enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib -- 
 enable-librist --enable-libsrt --enable-libssh --enable-libzmq -- 
 enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 
 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable- 
 libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 -- 
 enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 
 --enable-libxvid --enable-libaom --enable-libjxl --enable- 
 libopenjpeg --enable-libvpx --enable-mediafoundation --enable- 
 libass --enable-frei0r --enable-libfreetype --enable-libfribidi -- 
 enable-liblensfun --enable-libvidstab --enable-libvmaf --enable- 
 libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable- 
 ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable- 
 dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan -- 
 enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme 
 --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb 
 --enable-libmp3lame --enable-libshine --enable-libtheora --enable- 
 libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable- 
 libgsm --enable-libopencore-amrnb --enable-libopus --enable- 
 libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b -- 
 enable-libflite --enable-libmysofa --enable-librubberband -- 
 enable-libsoxr --enable-chromaprint

 libavutil      58.  2.100 / 58.  2.100
 libavcodec     60.  3.100 / 60.  3.100
 libavformat    60.  3.100 / 60.  3.100
 libavdevice    60.  1.100 / 60.  1.100
 libavfilter     9.  3.100 /  9.  3.100
 libswscale      7.  1.100 /  7.  1.100
 libswresample   4. 10.100 /  4. 10.100
 libpostproc    57.  1.100 / 57.  1.100

 [matroska,webm @ 0000018ef5f4e240] Could not find codec parameters 
 for stream 1 (Attachment: none): unknown codec
 Consider increasing the value for the 'analyzeduration' (0) and 
 'probesize' (5000000) options

 Input #0, matroska,webm, from '.\RGB.mkv':
 Metadata:
 title           : Azure Kinect
 encoder         : libebml v1.4.4 + libmatroska v1.7.1
 creation_time   : 2023-08-04T11:52:43.000000Z
 Duration: 00:00:40.03, start: 0.033000, bitrate: 126708 kb/s
 Stream #0:0(eng): Video: mjpeg (Baseline) (MJPG / 0x47504A4D), 
 yuvj422p(pc, bt470bg/unknown/unknown), 2048x1536, SAR 1:1 DAR 4:3, 
 30 fps, 30 tbr, 1k tbn (default)
 
 Metadata:
 title           : COLOR
  BPS             : 126696930
  DURATION        : 00:00:40.029000000
  NUMBER_OF_FRAMES: 1201
  NUMBER_OF_BYTES : 633943931
  _STATISTICS_WRITING_APP: mkvmerge v76.0 ('Celebration') 64-bit
  _STATISTICS_WRITING_DATE_UTC: 2023-08-04 11:52:43
  _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

Stream #0:1: Attachment: none
Metadata:
  filename        : calibration.json
  mimetype        : application/octet-stream
 Unsupported codec with id 0 for input stream 1

     


  


  This example video contains only one channel (RGB) from the original video. I am able to play this video using Azure Kinect Viewer.

  


• 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 !