ok, i have re-encoded as 5.1 AC3 and tested and it works fine, ie i can choose DD as the optical output
Code:
ffmpeg version N-32348-g6dbac85, Copyright (c) 2000-2011 the FFmpeg developers
built on Sep 6 2011 16:03:56 with gcc 4.4.2
configuration: --enable-memalign-hack --arch=x86 --target-os=mingw32 --cross-prefix=i686-mingw32- --enable-static --disable-shared --enable-zlib --disable-ffplay --prefix=/media/windows/ffmpeg --enable-libmp3lame --enable-libx264 --enable-gpl --extra-libs='-lx264 -lpthread' --enable-runtime-cpudetect --pkg-config=pkg-config
libavutil 51. 16. 0 / 51. 16. 0
libavcodec 53. 13. 0 / 53. 13. 0
libavformat 53. 11. 0 / 53. 11. 0
libavdevice 53. 3. 0 / 53. 3. 0
libavfilter 2. 37. 0 / 2. 37. 0
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0
[matroska,webm @ 003f8c80] Estimating duration from bitrate, this may be inaccurate
Seems stream 0 codec frame rate differs from container frame rate: 47.95 (5000000/104271) -> 23.98 (24000/1001)
Input #0, matroska,webm, from 'D:\TV shows\ghost in the shell\Ghost in the Shell S.A.C. 2nd GIG E01.mkv':
Duration: 00:24:32.22, start: 0.000000, bitrate: 384 kb/s
Stream #0.0: Video: h264 (High), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
Stream #0.1: Audio: ac3, 44100 Hz, 5.1(side), s16, 384 kb/s (default)
At least one output file must be specified
---> DB Level Info: 41, 100
---> Frame rate: 23.98
---> Aspect ratio: 16:9
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