#5892: Show Qavg -nan when end of aac stream
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  chengmo03013106                    |                   Status:  new
                 Type:  defect       |                Component:  avcodec
             Priority:  important    |               Resolution:
              Version:  unspecified  |               Blocked By:
             Keywords:  aac crash    |  Reproduced by developer:  0
  fpe regression                     |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by chengmo03013106):

 backtrace --------------------
 Breakpoint 1, aac_encode_end (avctx=0x7f0b70258c00) at
 libavcodec/aacenc.c:844
 844         AACEncContext *s = avctx->priv_data;
 (gdb) n
 846         av_log(avctx, AV_LOG_INFO, "Qavg: %.3f\n", s->lambda_sum /
 s->lambda_count);
 (gdb) p s->lambda_count
 $2 = 0                       // I meat this value should be 0, because it
 's divider.
 (gdb) bt
 #0  aac_encode_end (avctx=0x7f0b70258c00) at libavcodec/aacenc.c:848
 #1  0x0000000000b324ca in avcodec_close (avctx=0x7f0b70258c00) at
 libavcodec/utils.c:2545

 After line 846 run ,the out put :
 [aac @ 0x7f0b70258c00] Qavg: -nan

 disassemble ----------------------------
 Dump of assembler code for function aac_encode_end:
    0x0000000000e125b8 <+0>:     push   %rbp
    0x0000000000e125b9 <+1>:     mov    %rsp,%rbp
    0x0000000000e125bc <+4>:     sub    $0x20,%rsp
    0x0000000000e125c0 <+8>:     mov    %rdi,-0x18(%rbp)
    0x0000000000e125c4 <+12>:    mov    -0x18(%rbp),%rax
    0x0000000000e125c8 <+16>:    mov    0x48(%rax),%rax
    0x0000000000e125cc <+20>:    mov    %rax,-0x8(%rbp)
    0x0000000000e125d0 <+24>:    mov    -0x8(%rbp),%rax
    0x0000000000e125d4 <+28>:    movss  0x968c(%rax),%xmm1
    0x0000000000e125dc <+36>:    mov    -0x8(%rbp),%rax
    0x0000000000e125e0 <+40>:    mov    0x9690(%rax),%eax
    0x0000000000e125e6 <+46>:    cvtsi2ss %eax,%xmm0
    0x0000000000e125ea <+50>:    movaps %xmm1,%xmm2
    0x0000000000e125ed <+53>:    divss  %xmm0,%xmm2
    0x0000000000e125f1 <+57>:    movaps %xmm2,%xmm0
    0x0000000000e125f4 <+60>:    unpcklps %xmm0,%xmm0
    0x0000000000e125f7 <+63>:    cvtps2pd %xmm0,%xmm0
    0x0000000000e125fa <+66>:    mov    -0x18(%rbp),%rax
    0x0000000000e125fe <+70>:    mov    $0x139ce75,%edx
    0x0000000000e12603 <+75>:    mov    $0x20,%esi
    0x0000000000e12608 <+80>:    mov    %rax,%rdi
    0x0000000000e1260b <+83>:    mov    $0x1,%eax
    0x0000000000e12610 <+88>:    callq  0xfb9bc5 <av_log>
 => 0x0000000000e12615 <+93>:    mov    -0x8(%rbp),%rax
    0x0000000000e12619 <+97>:    add    $0x50,%rax
    0x0000000000e1261d <+101>:   mov    %rax,%rdi
    0x0000000000e12620 <+104>:   callq  0x952ecf <ff_mdct_end>
    0x0000000000e12625 <+109>:   mov    -0x8(%rbp),%rax
    0x0000000000e12629 <+113>:   add    $0xb8,%rax
    0x0000000000e1262f <+119>:   mov    %rax,%rdi
    0x0000000000e12632 <+122>:   callq  0x952ecf <ff_mdct_end>
    0x0000000000e12637 <+127>:   mov    -0x8(%rbp),%rax
    0x0000000000e1263b <+131>:   add    $0x9618,%rax
    0x0000000000e12641 <+137>:   mov    %rax,%rdi
    0x0000000000e12644 <+140>:   callq  0xf44b10 <ff_psy_end>
    0x0000000000e12649 <+145>:   mov    -0x8(%rbp),%rax
    0x0000000000e1264d <+149>:   add    $0x280,%rax
    0x0000000000e12653 <+155>:   mov    %rax,%rdi
    0x0000000000e12656 <+158>:   callq  0x94f76f <ff_lpc_end>
    0x0000000000e1265b <+163>:   mov    -0x8(%rbp),%rax
    0x0000000000e1265f <+167>:   mov    0x9668(%rax),%rax
    0x0000000000e12666 <+174>:   test   %rax,%rax
    0x0000000000e12669 <+177>:   je     0xe1267e <aac_encode_end+198>
    0x0000000000e1266b <+179>:   mov    -0x8(%rbp),%rax
    0x0000000000e1266f <+183>:   mov    0x9668(%rax),%rax
    0x0000000000e12676 <+190>:   mov    %rax,%rdi
    0x0000000000e12679 <+193>:   callq  0xf44de2 <ff_psy_preprocess_end>
    0x0000000000e1267e <+198>:   mov    -0x8(%rbp),%rax
    0x0000000000e12682 <+202>:   add    $0x8a840,%rax
    0x0000000000e12688 <+208>:   mov    %rax,%rdi
    0x0000000000e1268b <+211>:   callq  0xfbca0e <av_freep>
    0x0000000000e12690 <+216>:   mov    -0x8(%rbp),%rax
    0x0000000000e12694 <+220>:   add    $0x9610,%rax
    0x0000000000e1269a <+226>:   mov    %rax,%rdi
    0x0000000000e1269d <+229>:   callq  0xfbca0e <av_freep>
    0x0000000000e126a2 <+234>:   mov    -0x8(%rbp),%rax
 ---Type <return> to continue, or q <return> to quit---
    0x0000000000e126a6 <+238>:   add    $0x120,%rax
    0x0000000000e126ac <+244>:   mov    %rax,%rdi
    0x0000000000e126af <+247>:   callq  0xfbca0e <av_freep>
    0x0000000000e126b4 <+252>:   mov    -0x8(%rbp),%rax
    0x0000000000e126b8 <+256>:   add    $0x9698,%rax
    0x0000000000e126be <+262>:   mov    %rax,%rdi
    0x0000000000e126c1 <+265>:   callq  0xe6fc3e <ff_af_queue_close>
    0x0000000000e126c6 <+270>:   mov    $0x0,%eax
    0x0000000000e126cb <+275>:   leaveq
    0x0000000000e126cc <+276>:   retq


 register info -------------------
 rax            0x0      0
 rbx            0x3056b00        50686720
 rcx            0x3c37adb53d     258632168765
 rdx            0xc      12
 rsi            0x0      0
 rdi            0x7f0b7dbfcd80   139687331089792
 rbp            0x7f0b7dbfd340   0x7f0b7dbfd340
 rsp            0x7f0b7dbfd320   0x7f0b7dbfd320
 r8             0x7f0b7dbfe700   139687331096320
 r9             0x7f0b7dbfc594   139687331087764
 r10            0x0      0
 r11            0x0      0
 r12            0x3c3841c360     258641871712
 r13            0x7f0b7dbfe9c0   139687331097024
 r14            0x4      4
 r15            0x7      7
 rip            0xe12615 0xe12615 <aac_encode_end+93>
 eflags         0x202    [ IF ]
 cs             0x33     51
 ss             0x2b     43
 ds             0x0      0
 es             0x0      0
 fs             0x0      0
 gs             0x0      0

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5892#comment:8>
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