mszh: crash with yuv421

[ami_stuff]

attached file crashes ffmpeg here at the end of conversion (but I can't reproduce the crash under gdb)

maybe invalid read?

C:\>ffmpeg -i yuv421.avi out.avi
ffmpeg version N-53032-g37d9784 Copyright (c) 2000-2013 the FFmpeg developers
  built on May 14 2013 02:45:02 with gcc 4.5.0 (GCC) 20100414 (Fedora MinGW 4.5.
0-1.fc14)
  configuration: --prefix=/var/www/users/research/ffmpeg/snapshots/build --arch=
x86 --target-os=mingw32 --cross-prefix=i686-pc-mingw32- --cc='ccache i686-pc-min
gw32-gcc' --enable-w32threads --enable-memalign-hack --enable-runtime-cpudetect
--enable-cross-compile --enable-static --disable-shared --extra-libs='-lws2_32 -
lwinmm -lpthread' --extra-cflags='--static -I/var/www/users/research/ffmpeg/snap
shots/build/include' --extra-ldflags='-static -L/var/www/users/research/ffmpeg/s
napshots/build/lib' --enable-bzlib --enable-zlib --enable-gpl --enable-version3
--enable-nonfree --enable-libx264 --enable-libspeex --enable-libtheora --enable-
libvorbis --enable-libfaac --enable-libxvid --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libmp3lame --enable-libvpx --disable-decoder=libvpx
  libavutil      52. 31.100 / 52. 31.100
  libavcodec     55.  9.100 / 55.  9.100
  libavformat    55.  7.100 / 55.  7.100
  libavdevice    55.  0.100 / 55.  0.100
  libavfilter     3. 65.100 /  3. 65.100
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, avi, from 'yuv421.avi':
  Duration: 00:00:00.10, start: 0.000000, bitrate: 128029 kb/s
    Stream #0:0: Video: mszh (MSZH / 0x485A534D), yuv422p, 1022x768, 10 tbr, 10
tbn, 10 tbc
Output #0, avi, to 'out.avi':
  Metadata:
    ISFT            : Lavf55.7.100
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1022x768, q=2-31, 20
0 kb/s, 10 tbn, 10 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mszh -> mpeg4)
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=6.7 Lsize=      65kB time=00:00:00.10 bitrate=5348.2kbits/
s
video:60kB audio:0kB subtitle:0 global headers:0kB muxing overhead 9.333551%

[Carl Eugen Hoyos]

No invalid memory access here.
Does the crash also happen with a Zeranoe binary?

[ami_stuff]

Replying to cehoyos:

No invalid memory access here.
Does the crash also happen with a Zeranoe binary?

It doesn't. Maybe the problem have something to do with w32threads then?

[Carl Eugen Hoyos]

Replying to ami_stuff:

Maybe the problem have something to do with w32threads then?

Does the crash disappear if you compile with --disable-w32threads?

[ami_stuff]

Please try to reproduce with

ffmpeg -cpuflags -mmx -i yuv421.avi out.avi

(32bit build)

[Carl Eugen Hoyos]

Replying to ami_stuff:

Please try to reproduce with
ffmpeg -cpuflags -mmx -i yuv421.avi out.avi

It does crash with -cpuflags -mmx here (too) but my CPU is not MMX-only, it has other features that are not automatically disabled by -cpuflags -mmx, the following command line works fine here (and there is no hardware that supports SSE2, SSSE3 or SSE4.1 but not MMX):
$ ffmpeg -cpuflags -mmx-sse2-ssse3-sse4.1 -i yuv421.avi out.avi

(32bit build)

Same behaviour with 32bit and 64bit here.

[ami_stuff]

on my old athlon xp it crashed without -cpuflags option*, I can't test it there anymore

• at least with one build

[Carl Eugen Hoyos]

The question is if it works on the Athlon with -cpuflags -3dnow-3dnowext

[Carl Eugen Hoyos]

$ valgrind ./ffmpeg_g -i yuv421.avi out.avi
==11331== Memcheck, a memory error detector.
==11331== Copyright (C) 2002-2007, and GNU GPL'd, by Julian Seward et al.
==11331== Using LibVEX rev 1854, a library for dynamic binary translation.
==11331== Copyright (C) 2004-2007, and GNU GPL'd, by OpenWorks LLP.
==11331== Using valgrind-3.3.1, a dynamic binary instrumentation framework.
==11331== Copyright (C) 2000-2007, and GNU GPL'd, by Julian Seward et al.
==11331== For more details, rerun with: -v
==11331==
ffmpeg version N-53956-g57655c6 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jun 22 2013 14:18:10 with gcc 4.3.4 (GCC)
  configuration: --disable-optimizations --cc=/usr/local/gcc-4.3.4/bin/gcc
  libavutil      52. 35.100 / 52. 35.100
  libavcodec     55. 15.100 / 55. 15.100
  libavformat    55.  8.102 / 55.  8.102
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 75.101 /  3. 75.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
Input #0, avi, from 'yuv421.avi':
  Duration: 00:00:00.10, start: 0.000000, bitrate: 128029 kb/s
    Stream #0:0: Video: mszh (MSZH / 0x485A534D), yuv422p, 1022x768, 10 tbr, 10 tbn, 10 tbc
Output #0, avi, to 'out.avi':
  Metadata:
    ISFT            : Lavf55.8.102
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1022x768, q=2-31, 200 kb/s, 10 tbn, 10 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mszh -> mpeg4)
Press [q] to stop, [?] for help
==11331== Invalid write of size 8
==11331==    at 0x87072F0: ff_draw_edges_mmx (dsputil_mmx.c:389)
==11331==    by 0x85172B0: load_input_picture (mpegvideo_enc.c:1063)
==11331==    by 0x85188ED: ff_MPV_encode_picture (mpegvideo_enc.c:1448)
==11331==    by 0x861FC24: avcodec_encode_video2 (utils.c:1762)
==11331==    by 0x805C37E: do_video_out (ffmpeg.c:947)
==11331==    by 0x805CEAF: reap_filters (ffmpeg.c:1091)
==11331==    by 0x8066979: transcode_step (ffmpeg.c:3162)
==11331==    by 0x8066A3A: transcode (ffmpeg.c:3205)
==11331==    by 0x8066F4E: main (ffmpeg.c:3383)
==11331==  Address 0x50add50 is 0 bytes after a block of size 211,216 alloc'd
==11331==    at 0x4025CFA: memalign (in /usr/lib/valgrind/x86-linux/vgpreload_memcheck.so)
==11331==    by 0x4025DAE: posix_memalign (in /usr/lib/valgrind/x86-linux/vgpreload_memcheck.so)
==11331==    by 0x89245B3: av_malloc (mem.c:93)
==11331==    by 0x8917F7A: av_buffer_alloc (buffer.c:70)
==11331==    by 0x8917FE7: av_buffer_allocz (buffer.c:83)
==11331==    by 0x89185E6: pool_alloc_buffer (buffer.c:305)
==11331==    by 0x8918734: av_buffer_pool_get (buffer.c:343)
==11331==    by 0x861BE59: video_get_buffer (utils.c:550)
==11331==    by 0x861C1E6: avcodec_default_get_buffer2 (utils.c:615)
==11331==    by 0x861CB61: get_buffer_internal (utils.c:830)
==11331==    by 0x861CBB9: ff_get_buffer (utils.c:842)
==11331==    by 0x85740BE: thread_get_buffer_internal (pthread.c:929)
frame=    1 fps=0.3 q=6.7 Lsize=      65kB time=00:00:00.10 bitrate=5348.2kbits/s
video:60kB audio:0kB subtitle:0 global headers:0kB muxing overhead 9.331763%
==11331==
==11331== ERROR SUMMARY: 2 errors from 1 contexts (suppressed: 3 from 1)
==11331== malloc/free: in use at exit: 0 bytes in 0 blocks.
==11331== malloc/free: 2,732 allocs, 2,732 frees, 22,946,183 bytes allocated.
==11331== For counts of detected errors, rerun with: -v
==11331== All heap blocks were freed -- no leaks are possible.

[Carl Eugen Hoyos]

This was the same issue as ticket #2645, fixed in 175e916.