Bug#677035: libavcodec52: SEGV when encoding video

[giuseppe bonacci]

Package: libavcodec52
Version: 4:0.5.8-1
Severity: normal


When transcoding an MP4 stream (h264 + aac), to avi (mpeg4 + mp3lame),
I get a SEGV in sad16_sse2().  Please note that I have rebuilt
ffmpeg-0.5.8-1 (via dpkg-buildpackage) in order to include libmp3lame.

Here is the command line: 

/usr/bin/ffmpeg -i abc.mp4 -acodec libmp3lame -ab 128k -vcodec mpeg4 \
	-g 250 -bf 2 -qmin 1 -b 800k -s 626x360  abc.avi

Here are stdout and stderr:

[...]
Seems stream 0 codec frame rate differs from container frame rate: 50.00
(50/1) -> 25.00 (25/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'abc.mp4':
  Duration: 01:39:38.28, start: 0.000000, bitrate: 564 kb/s
    Stream #0.0(und): Video: h264, yuv420p, 626x360, 25 tbr, 25 tbn, 50 tbc
    Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16
File 'abc.avi' already exists. Overwrite ? [y/N] y
Output #0, avi, to 'abc.avi':
    Stream #0.0(und): Video: mpeg4, yuv420p, 626x360, q=1-31, 800 kb/s, 90k tbn, 25 tbc
    Stream #0.1(und): Audio: libmp3lame, 44100 Hz, stereo, s16, 128 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
Segmentation fault

Here is information from gdb:

(gdb) run
[...]
Program received signal SIGSEGV, Segmentation fault.
0xb7a4f0e9 in sad16_sse2 (v=0x0, blk2=0xb5d08ca2 '\020' <repeats 200 times>..., blk1=0xb5d8cca2 '\020' <repeats 46 times>, '\021' <repeats 20 times>, '\020' <repeats 134 times>..., stride=672, h=16)
    at /tmp/f/ffmpeg-0.5.8/libavcodec/x86/motion_est_mmx.c:95
95          __asm__ volatile(
(gdb) bt
#0  0xb7a4f0e9 in sad16_sse2 (v=0x0, blk2=0xb5d08ca2 '\020' <repeats 200 times>..., blk1=0xb5d8cca2 '\020' <repeats 46 times>, '\021' <repeats 20 times>, '\020' <repeats 134 times>..., stride=672, h=16)
    at /tmp/f/ffmpeg-0.5.8/libavcodec/x86/motion_est_mmx.c:95
#1  0xb787b786 in mpeg4_encode_mb (s=0x808d4e0, block=0x80e0e10, motion_x=0, motion_y=0) at /tmp/f/ffmpeg-0.5.8/libavcodec/h263.c:1075
#2  0xb77800b9 in encode_mb_internal (c=0x8083fc0, arg=0x808d5b4) at /tmp/f/ffmpeg-0.5.8/libavcodec/mpegvideo_enc.c:1695
#3  encode_mb (c=0x8083fc0, arg=0x808d5b4) at /tmp/f/ffmpeg-0.5.8/libavcodec/mpegvideo_enc.c:1732
#4  encode_thread (c=0x8083fc0, arg=0x808d5b4) at /tmp/f/ffmpeg-0.5.8/libavcodec/mpegvideo_enc.c:2554
#5  0xb770496e in avcodec_default_execute (c=0x8083fc0, func=0xb777d930 <encode_thread>, arg=0x10, ret=0xb5d8cca2, count=1, size=4) at /tmp/f/ffmpeg-0.5.8/libavcodec/utils.c:392
#6  0xb776c387 in encode_picture (avctx=0x8083fc0, buf=0xb688b020 "", buf_size=1352360, data=0xbfffe4dc) at /tmp/f/ffmpeg-0.5.8/libavcodec/mpegvideo_enc.c:2912
#7  MPV_encode_picture (avctx=0x8083fc0, buf=0xb688b020 "", buf_size=1352360, data=0xbfffe4dc) at /tmp/f/ffmpeg-0.5.8/libavcodec/mpegvideo_enc.c:1214
#8  0xb7706203 in avcodec_encode_video (avctx=0x8083fc0, buf=0xb688b020 "", buf_size=1352360, pict=0xbfffe4dc) at /tmp/f/ffmpeg-0.5.8/libavcodec/utils.c:508
#9  0x0804e166 in do_video_out (s=<value optimized out>, ost=DWARF-2 expression error: DW_OP_reg operations must be used either alone or in conjuction with DW_OP_piece.
) at /tmp/f/ffmpeg-0.5.8/ffmpeg.c:974
#10 0x080507e0 in output_packet (ist=0x8082db0, ist_index=<value optimized out>, ost_table=<value optimized out>, nb_ostreams=2, pkt=0xbffff408) at /tmp/f/ffmpeg-0.5.8/ffmpeg.c:1358
#11 0x08054902 in av_encode (nb_output_files=<value optimized out>, nb_input_files=<value optimized out>, nb_stream_maps=<value optimized out>, stream_maps=<value optimized out>, 
    input_files=<value optimized out>, output_files=<value optimized out>) at /tmp/f/ffmpeg-0.5.8/ffmpeg.c:2153
#12 0x08054dd4 in main (argc=20, argv=0xbffff5d4) at /tmp/f/ffmpeg-0.5.8/ffmpeg.c:3928



-- System Information:
Debian Release: 6.0.5
  APT prefers stable
  APT policy: (990, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.32-5-686 (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash

Versions of packages libavcodec52 depends on:
ii  libavu 4:0.5.8-1                         ffmpeg utility library
ii  libc6  2.11.3-3                          Embedded GNU C Library: Shared lib
ii  libdir 1.0.2-3                           open and royalty free high quality
ii  libfaa 2.7-6                             freeware Advanced Audio Decoder - 
ii  libgsm 1.0.13-3                          Shared libraries for GSM speech co
ii  libmp3 3.98.4+repack2-3~bpo60+1          MP3 encoding library
ii  libope 0.1.2-1                           Adaptive Multi Rate speech codec -
ii  libope 0.1.2-1                           Adaptive Multi-Rate - Wideband spe
ii  libope 1.3+dfsg-4                        JPEG 2000 image compression/decomp
ii  libsch 1.0.9-2                           library for encoding/decoding of D
ii  libspe 1.2~rc1-1                         The Speex codec runtime library
ii  libthe 1.1.1+dfsg.1-3                    The Theora Video Compression Codec
ii  libvor 1.3.1-1+squeeze1                  The Vorbis General Audio Compressi
ii  libvor 1.3.1-1+squeeze1                  The Vorbis General Audio Compressi
ii  libx26 2:0.120.2151+gita3f4407-3~bpo60+1 x264 video coding library
ii  zlib1g 1:1.2.3.4.dfsg-3                  compression library - runtime

libavcodec52 recommends no packages.

libavcodec52 suggests no packages.

-- no debconf information