Hi,

 I've spent a few days searching for a way to resolve this issue, but as the title says I am having trouble getting x264 mkv's to play within 7mc + media browser on my xbox 360.  other file types will work.  I have gotten x264 mkv's with AC3 audio to work as well as xvid avi's and such.  When i attempt to open this file on the extender I get this message:

 "Could not start transcoding process"

 The log file for transcode360 lends a little bit more insight:

"
9/21/2009 7:07:17 PM *WRN* MEncoderTranscoder unable to handle request: F:\Movies 3\Harry Potter And The Goblet Of Fire (2005)\Harry.Potter.And.The.Goblet.Of.Fire.mkv
9/21/2009 7:07:17 PM *WRN* Failed to start transcoding
9/21/2009 7:10:41 PM       Transcoding from beginning
9/21/2009 7:10:41 PM       Starting transcoding process
9/21/2009 7:10:41 PM *VRB* Retrieving source stats:
9/21/2009 7:10:41 PM *VRB* Output: 'FFmpeg version 0.5, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --enable-gpl --enable-postproc --enable-swscale --enable-avfilter --enable-avfilter-lavf --enable-pthreads --enable-avisynth --enable-libfaac --enable-libfaad --enable-libmp3lame --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libxvid --enable-libx264 --enable-memalign-hack
  libavutil     49.15. 0 / 49.15. 0
  libavcodec    52.20. 0 / 52.20. 0
  libavformat   52.31. 0 / 52.31. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  libavfilter    0. 4. 0 /  0. 4. 0
  libswscale     0. 7. 1 /  0. 7. 1
  libpostproc   51. 2. 0 / 51. 2. 0
  built on Mar 16 2009 16:09:18, gcc: 4.2.4 [Sherpya]

Seems stream 0 codec frame rate differs from container frame rate: 47.95 (54042/1127) -> 23.98 (24000/1001)
Input #0, matroska, from 'F:\Movies 3\Harry Potter And The Chamber Of Secrets (2002)\Harry.Potter.And.The.Chamber.Of.Secrets.mkv':
  Duration: 02:40:56.09, start: 0.000000, bitrate: N/A
    Stream #0.0(eng): Video: h264, yuv420p, 1280x536, PAR 1:1 DAR 160:67, 23.98 tbr, 1k tbn, 47.95 tbc
    Stream #0.1(eng): Audio: dca, 48000 Hz, 5.1, s16
    Stream #0.2(eng): Subtitle: 0x0000
    Stream #0.3: Attachment: 0x0000
    Stream #0.4: Attachment: 0x0000
    Stream #0.5: Attachment: 0x0000
    Stream #0.6: Attachment: 0x0000
    Stream #0.7: Attachment: 0x0000
    Stream #0.8: Attachment: 0x0000
At least one output file must be specified
'
9/21/2009 7:10:41 PM *VRB* Parsed video dimensions: Video: h264, yuv420p, 1280x536
9/21/2009 7:10:41 PM *VRB* Parsed video dimensions: 1280x536
9/21/2009 7:10:41 PM *VRB* Parsed audio stats: dca, 48000 Hz, 5.1, s16

9/21/2009 7:10:41 PM *VRB* Parsed audio channels: 2
9/21/2009 7:10:41 PM *VRB* MEncoderTranscoder loaded
9/21/2009 7:10:41 PM *VRB* VLCTranscoder loaded
9/21/2009 7:10:41 PM *VRB* Using optimal resolutions
9/21/2009 7:10:41 PM       Spawning: "C:\Program Files\Transcode360\Wrappers\MEncoderTranscoder\mencoder.exe" -quiet -delay 0.2 -oac lavc -srate 48000 -af lavcresample=48000 -of mpeg -mpegopts format=dvd -o "C:\Users\Public\Transcode360\TranscodeBuffer\Harry.Potter.And.The.Chamber.Of.Secrets.360" -lavdopts threads=2 -ovc lavc -vf scale=720:301,expand=720:400,harddup -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=8000:keyint=15:aspect=16/9:acodec=mp2:abitrate=320 -ofps 24000/1001 "F:\Movies 3\Harry Potter And The Chamber Of Secrets (2002)\Harry.Potter.And.The.Chamber.Of.Secrets.mkv"
9/21/2009 7:10:56 PM *ERR* Transcoding error:
9/21/2009 7:10:56 PM *ERR* Cannot get Console handle of stdout

WARNING: OUTPUT FILE FORMAT IS _MPEG_. See -of help.
Cannot find codec 'dts' in libavcodec...
ADecoder init failed :(

9/21/2009 7:10:56 PM *WRN* MEncoderTranscoder unable to handle request: F:\Movies 3\Harry Potter And The Chamber Of Secrets (2002)\Harry.Potter.And.The.Chamber.Of.Secrets.mkv
9/21/2009 7:10:56 PM *WRN* Failed to start transcoding"

This seems to suggest to me that either mencoder.exe or ffmpeg.exe is having trouble with the DTS audio.  I understand the xbox360 cannot support DTS and am fine with it transcoding it to whatever format is easiest, though AC3 would be nice.  My mencoder.exe and ffmped.exe files are updated and transcode360 is installed following the guide on hack7mc: http://www.hack7mc.com/2009/06/setting-up-transcode-360-in-windows-7-with-cw-kid.html

I have read some information about DivX releasing some pack that allows for native support for h.264 streaming with AC3.  If this can be made to work with my DTS x264 mkv files that would be fantastic.  However, right now transcode 360 is able to play 75% of my files  and i don't want to lose that functionality.

Thank you for any help.  My head is starting to spin from reading so many forum posts and newsgroup articles and guides and comments.

 as an update i have installed the DivX labs software for native mkv support and ac3filter with no other codec packs and ALL mkv's are currently working on my 360 extender.  DTS and AC3, 720p and 1080p x264 files.  I have disabled transcode360 in media browser and so far my xvid files have continued working.  all that is left is trying to get ISO's to display properly in media browser and to properly mount 100% of the time.  I hope this helps someone.  and if anyone has experience getting ISO's to work properly in media browser, both on the host machine and the extender, that would be greatly appreciated.