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• Interfacing to an Xbox Optical Drive

  1er octobre 2013, par Multimedia Mike — xbox

  The next generation Xbox is going to hit the streets soon. But for some reason, I’m still interested in the previous generation’s unit (i.e., the original Xbox). Specifically, I’ve always wondered if it’s possible to use the original Xbox’s optical drive in order to read Xbox discs from Linux. I was never curious enough to actually buy an Xbox just to find out but I eventually came across a cast-off console on a recycle pile.

  I have long known that the Xbox has what appears to be a more or less standard optical drive with a 40-pin IDE connector. The only difference is the power adapter which I surmise is probably the easiest way to turn a bit of standardized hardware into a bit of proprietary hardware. The IDE and power connectors look like this :

  
  
  

  Thus, I wanted to try opening an Xbox and plugging the optical drive into a regular PC, albeit one that supports IDE cables, and allow the Xbox to supply power to the drive. Do you still have hardware laying around that has 40-pin IDE connectors ? I guess my Mac Mini PPC fits the bill, but I’ll be darned if I’m going to pry that thing open again. I have another IDE-capable machine buried in my closet, last called into service when I needed a computer with a native RS-232 port 3 years ago. The ordeal surrounding making this old computer useful right now can be another post entirely.

  Here’s what the monstrosity looks like thanks to characteristically short IDE cable lengths :

  
  

  

  Click for larger image

  
  

  Process :

  1. Turn on Xbox first
  2. Turn on PC

  Doing these things in the opposite order won’t work since the kernel really wants to see the drive when booting up. Inspecting the 'dmesg' log afterward reveals interesting items :
  

  <br />
hdd: PHILIPS XBOX DVD DRIVE, ATAPI CD/DVD-ROM drive<br />
hdd: host max PIO5 wanted PIO255(auto-tune) selected PIO4<br />
hdd: UDMA/33 mode selected<br />
[...]<br />
hdd: ATAPI DVD-ROM drive, 128kB Cache<br />

  Why is that interesting ? When is the last time to saw disk devices prefixed by ‘hd’ rather than ‘sd’ ? Blast from the past. Oh, and the optical drive’s vendor string clearly indicates that this is an Xbox drive saying ‘hi !’.

  Time To Read
  When I first studied an Xbox disc in a normal optical drive, I noticed that I was able to read 6992 2048-byte sectors — about 14 MB of data — as reported by the disc table of contents (TOC). This is just enough data to play a standard DVD video animation that kindly instructs the viewer to please use a proper Xbox. At this point, I estimated that there must be something special about Xbox optical drive firmware that knows how to read alternate information on these discs and access further sectors.

  I ran my TOC query tool with an Xbox Magazine demo disc in the optical drive and it reported substantially more than 6992 sectors, enough to account for more than 2 GB of data. That’s promising. I then tried running 'dd' against the device and it was able to read… about 14 MB, an exact quantity of bytes that, when divided by 2048 bytes/sector, yields 6992 sectors.

  Future (Past ?) Work
  Assuming Google is your primary window into the broader internet, the world is beginning to lose its memory of things pertaining to the original Xbox (Microsoft’s naming scheme certainly doesn’t help searches). What I’m saying is that it can be difficult to find information about this stuff now. However, I was able to learn that a host needs to perform a sort of cryptographic handshake with the drive at the SCSI level before it is allowed to access the forbidden areas of the disc. I think. I’m still investigating this and will hopefully post more soon.

• How can I stream mjpeg file as rtsp

  24 août 2013, par Ilya Yevlampiev

  We have an mjpeg video, obtained from the webcam and stored into *.avi file, still encoded as mjpeg.

  We need to restream this file as rtsp (and stil preserve the mjpeg there, i.e. no decoding). The goal is to emulate the webcam this video was obtained from for the software that processes the video. The file can be open with vlc/ffplay with no problems. The ffmpeg behaves like it is streaming it, however, ffplay/vlc can't open this stream.

  We tried to stream if with gstreamer.

  1) we fount no free rtsp sink element for gstreamer pipeline. So, is there a free analogue for rtspsink to launch this pipeline with gst-launch ? we need and only cast, so we don't need so advanced element as rtspsink is.

  2) we also tried to build own simple rtsp server as described in http://weeklybuild.com/2013/01/creating-an-rtsp-stream-with-gstreamer/

  replacing videotestsrc with filesrc ; but what kind of elements we should use there ? usage of an only filesrc doesn't help ; we get the same problem as if we stream with ffmpeg. But what kind of lements we need there, if we dont' wan to decode/encode it, just to stream the file (to reproduce the thing what the webcam actually does).

   $ ffplay rtsp://127.0.0.1:8554/test -loglevel debug
  
   avplay version 0.8.5-6:0.8.5-1, Copyright (c) 2003-2012 the Libav developers
  
   built on Jan 13 2013 12:05:48 with gcc 4.7.2
  
   configuration: --arch=amd64 --enable-pthreads --enable-runtime-cpudetect --extra-version='6:0.8.5-1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
   avutil      configuration: --arch=amd64 --enable-pthreads --enable-runtime-cpudetect --extra-version='6:0.8.4-1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
   avcodec     configuration: --arch=amd64 --enable-pthreads --enable-runtime-cpudetect --extra-version='6:0.8.4-1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
   avformat    configuration: --arch=amd64 --enable-pthreads --enable-runtime-cpudetect --extra-version='6:0.8.4-1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
   swscale     configuration: --arch=amd64 --enable-pthreads --enable-runtime-cpudetect --extra-version='6:0.8.4-1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
  postproc    configuration: --arch=amd64 --enable-pthreads --enable-runtime-cpudetect --extra-version='6:0.8.4-1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libdirac --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-            postproc --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
  libavutil    51. 22. 1 / 51. 22. 1
  
  libavcodec   53. 35. 0 / 53. 35. 0
  
  libavformat  53. 21. 1 / 53. 21. 0
  
  libavdevice  53.  2. 0 / 53.  2. 0
  
  libavfilter   2. 15. 0 /  2. 15. 0
  
  libswscale    2.  1. 0 /  2.  1. 0
  
  libpostproc  52.  0. 0 / 52.  0. 0
  
  [rtsp @ 0x7f558c0008c0] method DESCRIBE failed: 503 Service Unavailable
  
  [rtsp @ 0x7f558c0008c0] CSeq: 2
  
   Server: GStreamer RTSP server
  
   Date: Thu, 22 Aug 2013 07:49:30 GMT
  
  
  
   rtsp://127.0.0.1:8554/test: Invalid data found when processing input

  And everything is okay when I try gstreamer server built as in example, i.e. using videotestsrc

• 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'