[FFmpeg-trac] #269(undetermined:open): webm/libvpx Conversion bug

[FFmpeg]

#269: webm/libvpx Conversion bug
-----------------------+---------------------------
Reporter:  yxmline     |       Owner:  michael
    Type:  defect      |      Status:  open
Priority:  important   |   Component:  undetermined
 Version:  git-master  |  Resolution:
Keywords:              |  Blocked By:
Blocking:              |  Reproduced:  1
Analyzed:  0           |
-----------------------+---------------------------
Changes (by cehoyos):

 * cc: mingw-gcc-4.5.2-tdm-1 (removed)
 * priority:  normal => important
 * version:  git => git-master
 * component:  FFmpeg => undetermined
 * reproduced:  0 => 1


Comment:

 This is a regression.
 {{{
 (gdb) r -i tests/lena.pnm out.webm
 ffmpeg version git-N-30606-g40da61e, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Jun  7 2011 12:59:16 with gcc 4.5.3
   configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc --enable-libvpx
 --enable-libvorbis
   libavutil    51.  6. 1 / 51.  6. 1
   libavcodec   53.  6. 1 / 53.  6. 1
   libavformat  53.  2. 0 / 53.  2. 0
   libavdevice  53.  1. 1 / 53.  1. 1
   libavfilter   2. 14. 0 /  2. 14. 0
   libswscale    0. 14. 1 /  0. 14. 1
 Input #0, image2, from 'tests/lena.pnm':
   Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
     Stream #0.0: Video: ppm, rgb24, 256x256, 25 tbr, 25 tbn, 25 tbc
 Incompatible pixel format 'rgb24' for codec 'libvpx', auto-selecting
 format 'yuv420p'
 [buffer @ 0x1262980] w:256 h:256 pixfmt:rgb24 tb:1/1000000 sar:0/1
 sws_param:
 [ffsink @ 0x126b020] auto-inserting filter 'auto-inserted scaler 0'
 between the filter 'src' and the filter 'out'
 [scale @ 0x1265d20] w:256 h:256 fmt:rgb24 -> w:256 h:256 fmt:yuv420p
 flags:0x4
 [libvpx @ 0x1262fc0] v0.9.6
 Output #0, webm, to 'out.webm':
   Metadata:
     encoder         : Lavf53.2.0
     Stream #0.0: Video: libvpx, yuv420p, 256x256, q=2-31, 200 kb/s, 1k
 tbn, 25 tbc
 Stream mapping:
   Stream #0.0 -> #0.0
 Press [q] to stop, [?] for help
 frame=    1 fps=  0 q=0.0 Lsize=      11kB time=00:00:00.04
 bitrate=2320.0kbits/s
 video:11kB audio:0kB global headers:0kB muxing overhead 4.260291%

 Program received signal SIGSEGV, Segmentation fault.
 0x000000000093bac3 in av_next_option (last=0x0, obj=<value optimized out>)
 at libavutil/opt.c:48
 48          else if (last || !(*(AVClass**)obj)->option->name) return
 NULL;
 (gdb) bt
 #0  0x000000000093bac3 in av_next_option (last=0x0, obj=<value optimized
 out>) at libavutil/opt.c:48
 #1  av_opt_free (last=0x0, obj=<value optimized out>) at
 libavutil/opt.c:526
 #2  0x0000000000786f1a in avcodec_close (avctx=0x1262fc0) at
 libavcodec/utils.c:862
 #3  0x000000000040d427 in transcode (nb_output_files=1,
 input_files=0x1269dc0, nb_input_files=1, stream_maps=0x0,
 nb_stream_maps=<value optimized out>, output_files=0xd05c40) at
 ffmpeg.c:2781
 #4  0x0000000000411bad in main (argc=<value optimized out>, argv=<value
 optimized out>) at ffmpeg.c:4551
 (gdb) disass $pc-32 $pc+20
 Dump of assembler code from 0x93baa3 to 0x93bad7:
 0x000000000093baa3 <av_opt_free+35>:    clc
 0x000000000093baa4 <av_opt_free+36>:    (bad)
 0x000000000093baa5 <av_opt_free+37>:    je     0x93baac <av_opt_free+44>
 0x000000000093baa7 <av_opt_free+39>:    cmp    $0x5,%eax
 0x000000000093baaa <av_opt_free+42>:    jne    0x93ba90 <av_next_option>
 0x000000000093baac <av_opt_free+44>:    movslq 0x10(%rbx),%rdi
 0x000000000093bab0 <av_opt_free+48>:    lea    0x0(%rbp,%rdi,1),%rdi
 0x000000000093bab5 <av_opt_free+53>:    callq  0x939610 <av_freep>
 0x000000000093baba <av_next_option+42>: test   %rbx,%rbx
 0x000000000093babd <av_next_option+45>: jne    0x93ba95 <av_next_option+5>
 0x000000000093babf <av_next_option+47>: mov    0x0(%rbp),%rax
 0x000000000093bac3 <av_next_option+51>: mov    0x10(%rax),%rbx
 0x000000000093bac7 <av_next_option+55>: cmpq   $0x0,(%rbx)
 0x000000000093bacb <av_next_option+59>: jne    0x93ba9f <av_opt_free+31>
 0x000000000093bacd <av_next_option+61>: nopl   (%rax)
 0x000000000093bad0 <av_opt_free+80>:    add    $0x8,%rsp
 0x000000000093bad4 <av_opt_free+84>:    pop    %rbx
 0x000000000093bad5 <av_opt_free+85>:    pop    %rbp
 0x000000000093bad6 <av_opt_free+86>:    retq
 End of assembler dump.
 (gdb) info register
 rax            0x0      0
 rbx            0x0      0
 rcx            0x7af0   31472
 rdx            0x12942c0        19481280
 rsi            0x0      0
 rdi            0x1263740        19281728
 rbp            0x1263740        0x1263740
 rsp            0x7fffffffcd50   0x7fffffffcd50
 r8             0x0      0
 r9             0x7ffff6506eb0   140737325854384
 r10            0x7ffff6506eb0   140737325854384
 r11            0x206    518
 r12            0x0      0
 r13            0x126b420        19313696
 r14            0xffffffff       4294967295
 r15            0x0      0
 rip            0x93bac3 0x93bac3 <av_next_option+51>
 eflags         0x10246  [ PF ZF IF RF ]
 cs             0x33     51
 ss             0x2b     43
 ds             0x0      0
 es             0x0      0
 fs             0x0      0
 gs             0x0      0
 fctrl          0x37f    895
 fstat          0x0      0
 ftag           0xffff   65535
 fiseg          0x0      0
 fioff          0x0      0
 foseg          0x0      0
 fooff          0x0      0
 fop            0x0      0
 mxcsr          0x1fa0   [ PE IM DM ZM OM UM PM ]
 }}}

-- 
Ticket URL: <https://avcodec.org/trac/ffmpeg/ticket/269#comment:3>
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