lowres 3 with etymonix_mpeg2 file = crash

[ami_stuff]

the file from issue 1603 crashes with "-vlowres 3"

​https://roundup.libav.org/file651/etymonix_mpeg2.avi'

C:\>ffmpeg -vlowres 3 -i "C:\etymonix_mpeg2.avi" out.avi
FFmpeg version git-N-29181-ga304071, Copyright (c) 2000-2011 the FFmpeg develope
rs
  built on Apr 18 2011 21:24:03 with gcc 4.5.2
  configuration: --enable-gpl --enable-version3 --enable-runtime-cpudetect --ena
ble-memalign-hack --enable-avisynth --enable-bzlib --enable-frei0r --enable-libo
pencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --
enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger
 --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enabl
e-libx264 --enable-libxavs --enable-libxvid --enable-zlib --cross-prefix=i686-w6
4-mingw32- --target-os=mingw32 --arch=x86_32 --extra-cflags=-I/home/kyle/softwar
e/ffmpeg/external-libraries/win32/include --extra-ldflags=-L/home/kyle/software/
ffmpeg/external-libraries/win32/lib --pkg-config=pkg-config
  libavutil    50. 40. 1 / 50. 40. 1
  libavcodec   52.120. 0 / 52.120. 0
  libavformat  52.108. 0 / 52.108. 0
  libavdevice  52.  4. 0 / 52.  4. 0
  libavfilter   1. 79. 0 /  1. 79. 0
  libswscale    0. 13. 0 /  0. 13. 0
[mpeg2video @ 022721B0] mpeg_decode_postinit() failure
[mpeg2video @ 022721B0] intra matrix invalid, ignoring
Input #0, avi, from 'C:\etymonix_mpeg2.avi':
  Duration: 00:00:05.00, start: 0.000000, bitrate: 11556 kb/s
    Stream #0.0: Video: mpeg2video (Main), yuv444p, 40x30 [PAR 1:1 DAR 4:3], 0 k
b/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
Incompatible pixel format 'yuv444p' for codec 'mpeg4', auto-selecting format 'yu
v420p'
[buffer @ 01CF2BB0] w:40 h:30 pixfmt:yuv444p
[ffsink @ 01CF32D0] auto-inserting filter 'auto-inserted scaler 0' between the f
ilter 'src' and the filter 'out'
[scale @ 01CF3570] w:40 h:30 fmt:yuv444p -> w:40 h:30 fmt:yuv420p flags:0x4
Output #0, avi, to 'out.avi':
  Metadata:
    ISFT            : Lavf52.108.0
    Stream #0.0: Video: mpeg4, yuv420p, 40x30 [PAR 1:1 DAR 4:3], q=2-31, 200 kb/
s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop encoding
[mpeg2video @ 022721B0] mpeg_decode_postinit() failure
[mpeg2video @ 022721B0] intra matrix invalid, ignoring
    Last message repeated 2 times

[Michael Niedermayer]

fixed