support matrox uncompressed alpha sd & hd (m103 & m104)

[ami_stuff]

it should be the same

m103:

​https://www.datafilehost.com/d/4625bdce

m104:

​https://www.datafilehost.com/d/56f7f954

D:\>ffmpeg -i m103_720_576_8bit_alpha_progresive.avi
ffmpeg version N-79690-g78baa45 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.0 (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-libbs2b --enable-libcaca --
enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-lib
modplug --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enabl
e-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable
-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --ena
ble-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx
264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable
-lzma --enable-decklink --enable-zlib
  libavutil      55. 23.100 / 55. 23.100
  libavcodec     57. 38.100 / 57. 38.100
  libavformat    57. 34.103 / 57. 34.103
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 44.100 /  6. 44.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
[avi @ 00000000004b0400] Could not find codec parameters for stream 0 (Video: no
ne (M103 / 0x3330314D), none, 720x576, 315535 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, avi, from 'm103_720_576_8bit_alpha_progresive.avi':
  Metadata:
    date            : 2016-05-05T10:55:36+02:00
    encoder         : Adobe Premiere Pro CC 2015 (Windows)
  Duration: 00:00:00.70, start: 0.000000, bitrate: 300723 kb/s
    Stream #0:0: Video: none (M103 / 0x3330314D), none, 720x576, 315535 kb/s, 29
.97 fps, 29.97 tbr, 29.97 tbn
At least one output file must be specified

[Elon Musk]

Files are gone and ​http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket5519/ is empty.

[Carl Eugen Hoyos]

Replying to richardpl:

Files are gone and ​http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket5519/ is empty.

Should be fixed, thank you!