[Solved] 9/10 of files missing - Unknown video file type

Please, Please Help!

The vast majority of my video files are missing. See Advanced Debug and ffmpeg details

=================================================================================================================
DEBUG [LibraryAdditionsCheckerThread] Found file 'Christmas Miracle [2012] {NR}.avi', checking if it's already in the Library
DEBUG [MediaItemDAOImpl] Checking if DB already contains media item Christmas Miracle [2012] {NR}.avi
DEBUG [MediaItemDAOImpl] Looking up a media item for file path: U:\C\Christmas Miracle [2012] {NR}.avi, ignore case: true
DEBUG [MediaItemDAOImpl] Media item Christmas Miracle [2012] {NR}.avi doesn't exist in DB yet
DEBUG [LibraryAdditionsCheckerThread] File not in Library, will add it
DEBUG [VideoExtractionStrategy] Extracting metadata of video file: U:\C\Christmas Miracle [2012] {NR}.avi
DEBUG [FFMPEGWrapper] Invoking FFMPEG to retrieve media information for file: U:\C\Christmas Miracle [2012] {NR}.avi
DEBUG [ProcessExecutor] Starting C:\Program Files\Serviio\bin\\..\lib/ffmpeg.exe -i U:\C\Christmas Miracle [2012] {NR}.avi
DEBUG [LibraryManager] Skipping processing metadata for an unsupported file. Message: Unknown video file type.
=================================================================================================================

  Code:

C:\Program Files\Serviio\lib>ffmpeg.exe -i "U:\C\Christmas Miracle  [2012] {NR}.avi"
ffmpeg version N-48425-g9e36d9e Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan  3 2013 19:44:14 with gcc 4.7.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 13.100 / 52. 13.100
  libavcodec     54. 85.101 / 54. 85.101
  libavformat    54. 59.102 / 54. 59.102
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 30.102 /  3. 30.102
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[avi @ 00000000020eca80] non-interleaved AVI
Input #0, avi, from 'U:\C\Christmas Miracle  [2012] {NR}.avi':
  Metadata:
    encoder         : MEncoder 5.0
    title           : Christmas_Miracle___2012___NR_
  Duration: 01:31:29.02, start: 0.000000, bitrate: 2537 kb/s
    Stream #0:0: Video: mpeg4 (Simple Profile) (DX50 / 0x30355844), yuv420p, 720x404 [SAR 1:1 DAR 180:101], SAR 413696:413685 DAR 16384:9193, 29.97 fps, 29.97 tbr, 29.97 tbn, 30k tbc
    Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1(side), fltp, 448 kb/s

=================================================================================================================
DEBUG [LibraryAdditionsCheckerThread] Found file 'Aliens in the Attic [2009] {PG}.avi', checking if it's already in the Library
DEBUG [MediaItemDAOImpl] Checking if DB already contains media item Aliens in the Attic [2009] {PG}.avi
DEBUG [MediaItemDAOImpl] Looking up a media item for file path: U:\A\Aliens in the Attic [2009] {PG}.avi, ignore case: true
DEBUG [MediaItemDAOImpl] Media item Aliens in the Attic [2009] {PG}.avi doesn't exist in DB yet
DEBUG [LibraryAdditionsCheckerThread] File not in Library, will add it
DEBUG [VideoExtractionStrategy] Extracting metadata of video file: U:\A\Aliens in the Attic [2009] {PG}.avi
DEBUG [FFMPEGWrapper] Invoking FFMPEG to retrieve media information for file: U:\A\Aliens in the Attic [2009] {PG}.avi
DEBUG [ProcessExecutor] Starting C:\Program Files\Serviio\bin\\..\lib/ffmpeg.exe -i U:\A\Aliens in the Attic [2009] {PG}.avi
DEBUG [LibraryManager] Skipping processing metadata for an unsupported file. Message: Unknown video file type.
=================================================================================================================

  Code:

C:\Program Files\Serviio\lib>ffmpeg.exe -i "U:\A\Aliens in the Attic  [2009] {PG}.avi"
ffmpeg version N-48425-g9e36d9e Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan  3 2013 19:44:14 with gcc 4.7.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 13.100 / 52. 13.100
  libavcodec     54. 85.101 / 54. 85.101
  libavformat    54. 59.102 / 54. 59.102
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 30.102 /  3. 30.102
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Input #0, avi, from 'U:\A\Aliens in the Attic  [2009] {PG}.avi':
  Metadata:
    encoder         : MEncoder version 4.1.5 building on 20101022
  Duration: 01:25:42.00, start: 0.000000, bitrate: 1272 kb/s
    Stream #0:0: Video: mpeg4 (Simple Profile) (DX50 / 0x30355844), yuv420p, 720x404 [SAR 1:1 DAR 180:101], SAR 413696:413685 DAR 16384:9193, 29.97 fps, 29.97 tbr, 29.97 tbn, 30k tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 kb/s

[zip]

Are the files that work on the same drive? Do they all have {} in their file names

This is embarrassing...

The files are all located on a Network Access Server and the files in question had different security rights. After giving the service an account with full rights to the files it works perfectly.

Chalk this one up to a simple mistake made by a rookie to Serviio.