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• Why does my discord bot not able to find the file that is there when I open the folder manually ?

  22 juin 2021, par Toma

  I made a discord bot that should play music using ffmpeg.

  


  It's connecting and downloading the youtube webm file after which it should convert and rename it to song.mp3 but it doesn't manage to do so. I check the folder and the error message doesn't match what I see - the file is there and has been renamed.

  


  

  1. Am I using the replace command correctly to move the file ?

  


  2. I'd note that I'm using windows10 and that the folders are all read only and that although I'm the admin I can't change that no matter what I do (I guess it's a win10 bug). Does that have anything to do with it ?

  


  3. Is there another mistake in the code that'd prevent the file from being found by the bot ?

  


  


  My code :

  


  import discord
from discord.ext import commands
import youtube_dl #for url music command
import os

client = commands.Bot(command_prefix = '><')

#connect to voice channel
@client.command(aliases = ['c'])
async def connect(ctx, vcName):
    voice = discord.utils.get(client.voice_clients, guild=ctx.guild)
    voiceChannel = discord.utils.get(ctx.guild.channels, name=str(vcName))
    if voice == None: #if voice is not connected to any channel
        await voiceChannel.connect()
    else:
        if voice.channel == vcName: #if trying to connect to the same channel
            await ctx.send('already connected to this channel')
        else:
            await voice.move_to(vcName)

@client.command(aliases = ['d'])
async def delFile(ctx):
    song_there = os.path.exists(os.getcwd()+'/music/current/song.mp3') #true when song.mp3 exists in 'current' folder in 'music' folder
    if song_there:
        await ctx.send('song was detected')
        os.remove('song.mp3')
        if song_there:
            await ctx.send('song was not deleted')
    else:
        await ctx.send('File is not found. check the name again')

#play music from url

@client.command(aliases = ['p'])
async def playMusic(ctx, vcName, url : str): #play music file
    song_there = os.path.exists(os.path.join(os.getcwd(),'/music/current/song.mp3'))
    try:
        if song_there:
            print('previous song found')
            os.remove(os.path.join(os.getcwd(),'/music/current/song.mp3')) #removes the song in current to make room for a new song
            if song_there:
                print('song was not deleted')
            else:
                print('song deleted')
    except PermissionError:
        await ctx.send('A song is currently playing')
        return
    voiceChannel = discord.utils.get(ctx.guild.channels, name=str(vcName))
    ydl_opts = {
        'format': 'bestaudio/best',
        'postprocessors': [{
            'key': 'FFmpegExtractAudio',
            'preferredcodec': 'mp3',
            'preferredquality': '192',
        }]
    }


   for file in os.listdir('./'):
        if file.endswith('.mp3'):       #if song.mp3 already exists delete it to make room for a new download
            os.remove('song.mp3')
        else:                           #download the file from youtube
            with youtube_dl.YoutubeDL(ydl_opts) as ydl:
                ydl.download([url])
    for file in os.listdir('./'):       #after downloading rename the file and move it to current folder
        if not file == ('song.mp3') and file.endswith('.mp3'):
            os.rename(file, 'song.mp3')
            print(os.path.join(os.getcwd(), 'song.mp3'))
            print(os.path.join(os.getcwd(), '/music/current/song.mp3'))
            os.replace(os.path.join(os.getcwd(), 'song.mp3'), os.path.join(os.getcwd(), '/music/current/song.mp3'))   #move file to current

    voice = discord.utils.get(client.voice_clients, guild=ctx.guild)
    if not voice is None:               #if voice is already created
        if not voice.is_connected():    #and is not connected
            await voiceChannel.connect()
        voice.play(discord.FFmpegPCMAudio('song.mp3'))
    else:
        await ctx.send('Bot made an oopsy. Cast mending and heal bot.')
client.run('token')


  


  Error :

  


  [youtube] wkJ7oDMqz0A: Downloading webpage
[download] The Minor Bee-wkJ7oDMqz0A.webm has already been downloaded
[download] 100% of 5.13MiB
[ffmpeg] Destination: The Minor Bee-wkJ7oDMqz0A.mp3
Deleting original file The Minor Bee-wkJ7oDMqz0A.webm (pass -k to keep)
[youtube] wkJ7oDMqz0A: Downloading webpage
[download] Destination: The Minor Bee-wkJ7oDMqz0A.webm
[download] 100% of 5.13MiB in 00:00                   
[ffmpeg] Destination: The Minor Bee-wkJ7oDMqz0A.mp3
Deleting original file The Minor Bee-wkJ7oDMqz0A.webm (pass -k to keep)
[youtube] wkJ7oDMqz0A: Downloading webpage
[download] Destination: The Minor Bee-wkJ7oDMqz0A.webm
[download] 100% of 5.13MiB in 00:00                  
[ffmpeg] Destination: The Minor Bee-wkJ7oDMqz0A.mp3
Deleting original file The Minor Bee-wkJ7oDMqz0A.webm (pass -k to keep)
C:.....song.mp3 -> **C:/music/current/song.mp3**
Ignoring exception in command playMusic:
Traceback (most recent call last):
  File "C:\Program Files\Python38\lib\site-packages\discord\ext\commands\core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "C:...tut-bot.py", line 84, in playMusic
    os.replace(os.path.join(os.getcwd(), 'song.mp3'), os.path.join(os.getcwd(), '/music/current/song.mp3'))   #move file to current
FileNotFoundError: [WinError 3] The system cannot find the path specified: 'C:\....\\song.mp3' -> 'C:/music/current/song.mp3'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Program Files\Python38\lib\site-packages\discord\ext\commands\bot.py", line 939, in invoke
    await ctx.command.invoke(ctx)
  File "C:\Program Files\Python38\lib\site-packages\discord\ext\commands\core.py", line 863, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "C:\Program Files\Python38\lib\site-packages\discord\ext\commands\core.py", line 94, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: FileNotFoundError: [WinError 3] The system cannot find the path specified: 'C:\\...\\song.mp3' -> 'C:/music/current/song.mp3'


  


• Go / Cgo - How to access a field of a Cstruct - could not make it

  15 août 2021, par ChrisG

  I develope an application in Go for transcode an audio file from one format to another one :

  


  I use the goav library that use Cgo to bind the FFmpeg C-libs :
https://github.com/giorgisio/goav/

  


  ---

  


  The goav library ; package avformat has a typedef that cast the original FFmpeg lib C-Struct AVOutputFormat :

  


  type ( 
   OutputFormat               C.struct_AVOutputFormat
)


  


  In my code i have a variable called outputF of the type OutputFormat that is a C.struct_AVOutputFormat.

  


  The C real AVOutputFormat struct has fields :

  


  name, long_name, mime_type, extensions, audio_codec, video_codec, subtitle_codec,..


  


  and many fields more.

  


  See : https://ffmpeg.org/doxygen/2.6/structAVOutputFormat.html

  


  ---

  


  I verified the situation by fmt.Println(outputF) and reached :

  


  {0x7ffff7f23383 0x7ffff7f23907 0x7ffff7f13c33 0x7ffff7f23383 86017 61 0 128 <nil> 0x7ffff7f8cfa0 <nil> 3344 0x7ffff7e3ec10 0x7ffff7e3f410 0x7ffff7e3ecc0 <nil> 0x7ffff7e3dfc0 <nil> <nil> <nil> <nil> <nil> <nil> 0 0x7ffff7e3e070 0x7ffff7e3e020 <nil>}&#xA;</nil></nil></nil></nil></nil></nil></nil></nil></nil></nil>

  


  The audio codec field is on position 5 and contains 86017

  


  I verified the field name by using the package reflect :

  


  val := reflect.Indirect(reflect.ValueOf(outputF))
fmt.Println(val)
fmt.Println("Fieldname: ", val.Type().Field(4).Name)

Output:
Fieldname:  audio_codec


  


  ---

  


  I try to access the field audio_codec of the original AVOutputFormat using :

  


  fmt.Println(outputF.audio_codec)
ERROR: outputF.audio_codec undefined (cannot refer to unexported field or method audio_codec)


fmt.Println(outputF._audio_codec)
ERROR: outputF._audio_codec undefined (type *avformat.OutputFormat has no field or method _audio_codec)


  


  


  As i read in the Cgo documentation :
Within the Go file, C's struct field names that are keywords in Go can be accessed by prefixing them with an underscore : if x points at a C struct with a field named "type", x._type accesses the field. C struct fields that cannot be expressed in Go, such as bit fields or misaligned data, are omitted in the Go struct, replaced by appropriate padding to reach the next field or the end of the struct.

  


  


  But I have no idea what im doing wrong.

  


  Edit :
Okay for sure no underscore is required as audio_codec is not a keyword in Go. This i understood for now. But still there is the question why im not able to access the CStruct field "audio_codec".

  


• avcodec/sbrdsp_fixed : Fix negation overflow in sbr_neg_odd_64_c()

  30 juillet 2021, par Michael Niedermayer

  avcodec/sbrdsp_fixed : Fix negation overflow in sbr_neg_odd_64_c()
  Fixes : negation of -2147483648 cannot be represented in type 'int' ; cast to an unsigned type to negate this value to itself
  
  Fixes : 35593/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5182217725804544
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/sbrdsp_fixed.c