So I installed the Java addon. But where is it?

Yeah ffmpeg is huge!
What your saying though is a bummer. The one I have installed, I got from here: viewtopic.php?f=48&t=45661
Not sure if that one was yours or not. But that one works better than the one supplied on the nas albeit it has zilch as a version ID:

MainStore:/opt/serviio/log# ffmpeg -version FFmpeg version UNKNOWN, Copyright (c) 2000-2011 the FFmpeg developers built on Mar 20 2011 21:32:23 with gcc 4.3.2 configuration: --enable-pthreads --disable-shared --enable-static --enable-gpl --enable-libx264 --enable-libmp3lame libavutil 50.36. 0 / 50.36. 0 libavcore 0.16. 1 / 0.16. 1 libavcodec 52.108. 0 / 52.108. 0 libavformat 52.93. 0 / 52.93. 0 libavdevice 52. 2. 3 / 52. 2. 3 libavfilter 1.74. 0 / 1.74. 0 libswscale 0.12. 0 / 0.12. 0

That one is stored in /usr/local/bin/ffmpeg

I have another one stored in /opt/photos2/bin/ffmpeg:

MainStore:~# /opt/photos2/bin/ffmpeg -version FFmpeg version 0.6, Copyright (c) 2000-2010 the FFmpeg developers built on Aug 17 2011 08:41:25 with gcc 4.5.2 configuration: --prefix=/home/hagi/photos2/backend/ffmpeg-0.6/../.out --cc=gcc --extra-cflags='-ggdb -I/home/hagi/photos2/backend/ffmpeg-0.6/../.out/include' --extra-ldflags='-Wl,-rpath,/opt/photos2/lib -L/opt/photos2/lib' --disable-stripping --disable-devices --disable-ffplay --disable-ffprobe --disable-ffserver --disable-avdevice --enable-libx264 --enable-libmp3lame --enable-gpl --enable-shared --enable-memalign-hack libavutil 50.15. 1 / 50.15. 1 libavcodec 52.72. 2 / 52.72. 2 libavformat 52.64. 2 / 52.64. 2 libswscale 0.11. 0 / 0.11. 0

But the one I just did a configure followed by a build gives:

FFmpeg version 0.6.1, Copyright (c) 2000-2010 the FFmpeg developers built on Dec 14 2011 22:07:52 with gcc 4.1.2 20061115 (prerelease) (Debian 4.1.1-21) configuration: libavutil 50.15. 1 / 50.15. 1 libavcodec 52.72. 2 / 52.72. 2 libavformat 52.64. 2 / 52.64. 2 libavdevice 52. 2. 0 / 52. 2. 0 libswscale 0.11. 0 / 0.11. 0

The patch that I need in the latest version 0.9 fixes the following bug: https://ffmpeg.org/trac/ffmpeg/ticket/177
This patch apparently fixes a problem I am getting with "some", but not all .mkv files. Note that ReadyDLNA does not support these files. The neat thing about serviio is that it transcodes just about anythng and it presents itself much better than ReadyDLNA.....BTW, I found the problem I have been having that led me to this in the first place. Its the Seagate disks I am using freezing up when write-cache is enabled. Nothing to do with ReadyDLNA or any software that came from Netgear.

Anyway.... I think what your saying is I got to figure a way to compile 0.9 first and that aint going to be easy....

any pointers....hint ;)