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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.

• Audio object type 3 is not supported

  3 octobre 2013, par Ardoramor

  I am running into an issue with a custom-built ffmpeg. Basically, its a vanilla ffmpeg with x264 and fdk-aac libs enabled. I am feeding an SDP file through ffmpeg API and get the following error while passing the info to avcodec_open2 :

  Audio object type 3 is not supported

  My SDP file :

  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=Unnamed
  
  i=N/A
  
  c=IN IP4 192.168.1.1
  
  t=0 0
  
  a=recvonly
  
  m=audio 8204 RTP/AVP 96
  
  a=rtpmap:96 mpeg4-generic/32000
  
  a=fmtp:96 streamtype=5; profile-level-id=15; mode=AAC-hbr; config=1a88; SizeLength=13; IndexLength=3; IndexDeltaLength=3;
  
  a=control:trackID=0
  
  m=video 8202 RTP/AVP 96
  
  a=rtpmap:96 H264/90000
  
  a=fmtp:96 packetization-mode=1;profile-level-id=428028;sprop-parameter-sets=Z0KAKJWgKA9E,aM48gA==;
  
  a=control:trackID=1
  
  m=application 8206 RTP/AVP 96
  
  a=rtpmap:96 smpte336m/10
  
  a=control:trackID=2

  The following is the output I get from ffmpeg as I open the input, dump its format, and try to open input streams :

  Format sdp probed with size=2048 and score=50
  audio codec set to : aac
  audio samplerate set to : 32000
  audio channels set to : 1
  video codec set to : h264
  RTP Packetization Mode : 1
  RTP Profile IDC : 42 Profile IOP : 80 Level : 28
  Extradata set to 0xc8d3dc0 (size : 21) !
  File position before avformat_find_stream_info() is 522
  Audio object type 3 is not supported.
  Could not find codec parameters for stream 1 (Video : h264) : unspecified size
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  File position after avformat_find_stream_info() is 522
  Dumping input AV format
  Input #0, sdp, from 'conf/test.sdp' :

  Metadata :
  title :Unnamed
  comment :N/A

  Duration:N/A, bitrate:N/A

  Stream #0:0, 0, 1/32000: Audio: aac, 32000 Hz, 1 channels, fltp  
  
  
  
  Stream #0:1, 0, 1/90000: Video: h264, 90k tbr, 90k tbn, 180k tbc  
  
  
  
  Stream #0:2, 0, 1/90000: Data: none, 0/1  

  Audio object type 3 is not supported.

  I also see the error reported for not finding codec parameters for stream 1 :

  Could not find codec parameters for stream 1 (Video : h264) : unspecified size
  Consider increasing the value for the 'analyzeduration' and 'probesize' options

  However, I think that is due to me not running an actual rtp at the moment of the test.

  In any case, what may be the reason for getting audio object type 3 not supported exception ?

  UPDATE - Oct 02, 2013

  Static ffmpeg build gives the following flags :

  Static ffmpeg 2.0.1 build flag output :

  ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Sep 30 2013 22:24:00 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-54)
  
    configuration: --enable-gpl --enable-nonfree --enable-shared
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --enable-runtime-cpudetect --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-avfilter --enable-pthreads --enable-x11grab --enable-vdpau --disable-avisynth --enable-libdc1394 --enable-libfaac --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libx264 --enable-libxavs --enable-libxvid --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --disable-stripping

  My build is from ffmpeg 2.0.1 snapshot with the following flags :

  --enable-static --disable-shared --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfaac --enable-libmp3lame --enable-libx264 --disable-symver --disable-doc --disable-ffplay --enable-ffmpeg --disable-ffprobe --disable-ffserver --disable-avdevice --disable-avfilter --disable-filters --disable-devices --disable-everything --enable-avformat --enable-avcodec --enable-muxers --enable-protocols --enable-parsers --enable-demuxers --enable-decoders --enable-encoders --enable-bsfs --enable-network --enable-swscale  --disable-demuxer=sbg --disable-demuxer=dts --disable-parser=dca --disable-decoder=dca --enable-asm --enable-pthreads --enable-version3

  The fdk-aac library version I'm using :

  fdk-aac - 0.1.2

  So it seems that the same .sdp file causes Audio object type 3 error with my build but not with static but I really do not see what causes it (granted I am not an expert with ffmpeg API and may simply miss important details).

  Simplified code for opening .sdp file that doesn't include error checks and logic separation :

  AVFormatContext *inputContext = NULL;
  
  
  
  av_register_all();
  
  avformat_network_init();
  
  
  
  avformat_open_input(&inputContext, "test.sdp", NULL, NULL);
  
  avformat_find_stream_info(inputContext, NULL);
  
  
  
  int inAudioStreamIdx = av_find_best_stream(inputContext, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);
  
  AVStream *st = inputContext->streams[inAudioStreamIdx];
  
  
  
  AVCodecContext *dec_ctx = st->codec;
  
  AVCodec *dec = avcodec_find_decoder(dec_ctx->codec_id);
  
  
  
  avcodec_open2(dec_ctx, dec, NULL); // Fails here with Audio object type 3

  Am I opening the sdp input improperly ?

• How to solve issue for converting ismv file of h264 video codec and aac audio codec ?

  4 octobre 2013, par Priyal

  I want to convert transmux ismv file to mp4 format. ISMV file is encoded withe the following ffmpeg detail :

     Metadata:
  
     major_brand     : isml
  
     minor_version   : 1
  
     compatible_brands: piffiso2
  
     creation_time   : 2013-10-03 14:10:41
  
     Duration: 15:21:13.16, start: 0.000000, bitrate: 41 kb/s
  
     Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 64
  
                       kb/s (default)
  
     Metadata:
  
     creation_time   : 2013-10-03 14:10:41
  
     handler_name    : Audio
  
     Stream #0:1(und): Video: h264 (avc1 / 0x31637661), 1280x720, 3217 kb/s, 29.9
  
                       7 tbr, 10000k tbn, 20000k tbc (default)
  
  Metadata:
  
     creation_time   : 2013-10-03 14:10:41
  
     handler_name    : Video
  
     Stream #0:2(und): Data: none (dfxp / 0x70786664), 32 kb/s (default)
  
     Metadata:
  
     creation_time   : 2013-10-03 14:10:41
  
     handler_name    : Text

  I used the following ffmpeg command to transmux :

   ffmpeg -y -ss 00:00:10 -i Encoder1.ismv -vcodec libx264 -ar 44100 -t 40 -preset slow -qp 0  
  
   Encoder.mp4

  I got output as :

   ffmpeg version N-56010-g54d628a Copyright (c) 2000-2013 the FFmpeg developers
  
   built on Sep  4 2013 00:44:27 with gcc 4.7.3 (GCC)
  
   configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
   isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
   le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
   e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
   ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
   ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
   eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
   amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
   enable-libxvid --enable-zlib
  
       libavutil      52. 43.100 / 52. 43.100
  
       libavcodec     55. 31.100 / 55. 31.100
  
       libavformat    55. 16.100 / 55. 16.100
  
       libavdevice    55.  3.100 / 55.  3.100
  
       libavfilter     3. 83.102 /  3. 83.102
  
       libswscale      2.  5.100 /  2.  5.100
  
       libswresample   0. 17.103 /  0. 17.103
  
       libpostproc    52.  3.100 / 52.  3.100
  
   [aac @ 040f1ba0] TYPE_FIL: Input buffer exhausted before END element found
  
   [h264 @ 00353120] AVC: nal size -729776398
  
   [h264 @ 00353120] no frame!
  
   [h264 @ 00353120] AVC: nal size -570515285
  
   [h264 @ 00353120] no frame!
  
   [h264 @ 00353120] AVC: nal size -1477874754
  
   [h264 @ 00353120] no frame!
  
   [h264 @ 00353120] AVC: nal size -712314563
  
   [h264 @ 00353120] no frame!
  
   [h264 @ 00353120] AVC: nal size -23151524
  
   [h264 @ 00353120] no frame!
  
   [h264 @ 00353120] AVC: nal size -592499201
  
   [h264 @ 00353120] no frame!
  
   [h264 @ 00353120] AVC: nal size 225768173
  
   [h264 @ 00353120] no frame!
  
   [h264 @ 00353120] AVC: nal size 698187359
  
   [h264 @ 00353120] AVC: nal size 635127544
  
   [h264 @ 00353120] no frame!
  
   [h264 @ 00353120] AVC: nal size -1242688339
  
   [h264 @ 00353120] AVC: nal size 269543071
  
   [h264 @ 00353120] no frame!
  
   [mov,mp4,m4a,3gp,3g2,mj2 @ 0035e840] decoding for stream 1 failed
  
   [mov,mp4,m4a,3gp,3g2,mj2 @ 0035e840] Could not find codec parameters for stream
  
    1 (Video: h264 (avc1 / 0x31637661), 1280x720, 3217 kb/s): unspecified pixel form
  
    at Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\inetpub\media\archives\DEFAULT WEB S
  
    ITE\PushToPUblishPoint\Eagan_12034_Soccer_3-10-2013_14_10_19-isml\2013-10-03-14-
  
    10-35-436\Segment001\Encoder1.ismv':
  
     Metadata:
  
     major_brand     : isml
  
     minor_version   : 1
  
     compatible_brands: piffiso2
  
     creation_time   : 2013-10-03 14:10:41
  
     Duration: 15:21:13.16, start: 0.000000, bitrate: 41 kb/s
  
     Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 64
  
                       kb/s (default)
  
      Metadata:
  
     creation_time   : 2013-10-03 14:10:41
  
     handler_name    : Audio
  
     Stream #0:1(und): Video: h264 (avc1 / 0x31637661), 1280x720, 3217 kb/s, 29.9
  
                       7 tbr, 10000k tbn, 20000k tbc (default)
  
     Metadata:
  
     creation_time   : 2013-10-03 14:10:41
  
     handler_name    : Video
  
     Stream #0:2(und): Data: none (dfxp / 0x70786664), 32 kb/s (default)
  
     Metadata:
  
     creation_time   : 2013-10-03 14:10:41
  
     handler_name    : Text
  
  
  
   [buffer @ 04679480] Unable to parse option value "-1" as pixel format
  
                 Last message repeated 1 times
  
   [buffer @ 04679480] Error setting option pix_fmt to value -1.
  
   [graph 0 input from stream 0:1 @ 040f7380] Error applying options to the filter.
  
  
  
   Error opening filters!

  Please suggest the solution for Windows OS