snow: green lines with odd resolution and yuv410p

[ami_stuff]

C:\>ffmpeg -i indeo32.avi -an -s 99x99 -vcodec snow -pix_fmt yuv410p snow2.avi
ffmpeg version N-66012-g97b8809 Copyright (c) 2000-2014 the FFmpeg developers
  built on Sep  1 2014 00:07:41 with gcc 4.8.3 (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-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
 --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  3.100 / 56.  3.100
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  0.103 /  5.  0.103
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, avi, from 'indeo32.avi':
  Duration: 00:00:12.64, start: 0.000000, bitrate: 1551 kb/s
    Stream #0:0: Video: indeo3 (IV32 / 0x32335649), yuv410p, 320x240, 1413 kb/s,
 23.97 fps, 23.97 tbr, 23.97 tbn, 23.97 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16p, 128 k
b/s
Output #0, avi, to 'snow2.avi':
  Metadata:
    ISFT            : Lavf56.3.100
    Stream #0:0: Video: snow (SNOW / 0x574F4E53), yuv410p, 99x99, q=2-31, 200 kb
/s, 23.97 fps, 23.97 tbn, 23.97 tbc
    Metadata:
      encoder         : Lavc56.1.100 snow
Stream mapping:
  Stream #0:0 -> #0:0 (indeo3 (native) -> snow (native))
Press [q] to stop, [?] for help
frame=  303 fps=0.0 q=2.0 Lsize=     171kB time=00:00:12.64 bitrate= 111.0kbits/
s
video:158kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
verhead: 8.075293%

C:\>ffmpeg -i snow2.avi out.avi
ffmpeg version N-66012-g97b8809 Copyright (c) 2000-2014 the FFmpeg developers
  built on Sep  1 2014 00:07:41 with gcc 4.8.3 (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-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
 --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  3.100 / 56.  3.100
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  0.103 /  5.  0.103
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Input #0, avi, from 'snow2.avi':
  Metadata:
    encoder         : Lavf56.3.100
  Duration: 00:00:12.64, start: 0.000000, bitrate: 110 kb/s
    Stream #0:0: Video: snow (SNOW / 0x574F4E53), yuv410p, 99x99, 103 kb/s, 23.9
7 fps, 23.97 tbr, 23.97 tbn, 23.97 tbc
[mpeg4 @ 02f3d900] too many threads/slices (8), reducing to 7
Output #0, avi, to 'out.avi':
  Metadata:
    ISFT            : Lavf56.3.100
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 99x99, q=2-31, 200 k
b/s, 23.97 fps, 23.97 tbn, 23.97 tbc
    Metadata:
      encoder         : Lavc56.1.100 mpeg4
Stream mapping:
  Stream #0:0 -> #0:0 (snow (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
frame=  303 fps=0.0 q=2.3 Lsize=     382kB time=00:00:12.64 bitrate= 247.8kbits/
s
video:370kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
verhead: 3.458989%

[Carl Eugen Hoyos]

Probably not really a regression, but decoding output looked much better before bb29ee62

[Michael Niedermayer]

Fixed in cb3f13f90709cf1972e0da2e175e76532b80647c

[Timothy Gu]

(Actually fixed in 7517e932ffacdc99d34239f86314b376ffb63726)