iac: deadlock with forced codec

[ami_stuff]

​http://samples.mplayerhq.hu/mtv/comedian_auto.mtv

(gdb) r -threads 1 -acodec iac -i v/comedian_auto.mtv -vn -f null -
The program being debugged has been started already.
Start it from the beginning? (y or n) y

Starting program: /media/sdb1/ffmpeg-HEAD-93439e8/ffmpeg_g -threads 1 -acodec iac -i v/comedian_auto.mtv -vn -f null -
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
ffmpeg version 2.0-93439e8 Copyright (c) 2000-2013 the FFmpeg developers
  built on Sep 18 2013 23:23:15 with gcc 4.7 (Debian 4.7.2-5)
  configuration: --disable-yasm --enable-gpl --disable-ffprobe --disable-ffserver
  libavutil      52. 44.100 / 52. 44.100
  libavcodec     55. 31.101 / 55. 31.101
  libavformat    55. 18.100 / 55. 18.100
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 86.101 /  3. 86.101
  libswscale      2.  5.100 /  2.  5.100
  libswresample   0. 17.103 /  0. 17.103
  libpostproc    52.  3.100 / 52.  3.100
[iac @ 0x9115d40] frame header check failed!
[iac @ 0x9115d40] got 1F7.
[iac @ 0x9115d40] frame header check failed!
[iac @ 0x9115d40] got B2.
[iac @ 0x9115d40] frame header check failed!
[iac @ 0x9115d40] got 53.
[iac @ 0x9115d40] frame header check failed!
[iac @ 0x9115d40] got AC.
[iac @ 0x9115d40] frame header check failed!
[iac @ 0x9115d40] got 17C.
[iac @ 0x9115d40] frame header check failed!
[iac @ 0x9115d40] got AA.
[iac @ 0x9115d40] frame header check failed!
[iac @ 0x9115d40] got 3F.
[iac @ 0x9115d40] frame header check failed!
[iac @ 0x9115d40] got 1FD.
[iac @ 0x9115d40] frame header check failed!
[iac @ 0x9115d40] got 97.
[iac @ 0x9115d40] frame header check failed!
[iac @ 0x9115d40] got 176.

Program received signal SIGINT, Interrupt.
bit_allocation (flag=0, freebits=507, stream_format_code=2, chctx=0x10, 
    q=<optimized out>) at libavcodec/imc.c:555
555	                if (++chctx->bitsBandT[found_indx] == 6)
(gdb) bt
#0  bit_allocation (flag=0, freebits=507, stream_format_code=2, chctx=0x10, 
    q=<optimized out>) at libavcodec/imc.c:555
#1  imc_decode_block (ch=0, q=0x91166a0, avctx=0x9115d40)
    at libavcodec/imc.c:954
#2  imc_decode_frame (avctx=0x9115d40, data=0x913bb60, 
    got_frame_ptr=0xbffff020, avpkt=0xbfffef98) at libavcodec/imc.c:1029
#3  0x0867aa05 in avcodec_decode_audio4 (avctx=0x9115d40, frame=0x913bb60, 
    got_frame_ptr=got_frame_ptr@entry=0xbffff020, avpkt=avpkt@entry=0xbffff048)
    at libavcodec/utils.c:2137
#4  0x08234fe8 in try_decode_frame (st=st@entry=0x9115ac0, 
    avpkt=avpkt@entry=0x913bac0, options=0x9115ca0) at libavformat/utils.c:2494
#5  0x0823e691 in avformat_find_stream_info (ic=0x9114e60, options=0x9115ca0)
    at libavformat/utils.c:2936
#6  0x080a66b5 in open_input_file (o=o@entry=0xbffff50c, 
    filename=<optimized out>) at ffmpeg_opt.c:809
#7  0x080a4ed7 in open_files (inout=inout@entry=0x88e725b "input", 
    open_file=open_file@entry=0x80a62d0 <open_input_file>, 
    l=<error reading variable: Unhandled dwarf expression opcode 0xfa>, 
    l=<error reading variable: Unhandled dwarf expression opcode 0xfa>)
    at ffmpeg_opt.c:2494
#8  0x080ad0e9 in ffmpeg_parse_options (argc=argc@entry=11, 
    argv=argv@entry=0xbffff994) at ffmpeg_opt.c:2531
#9  0x080a25da in main (argc=11, argv=0xbffff994) at ffmpeg.c:3393
(gdb) 

[Michael Niedermayer]

Fixed in 3e0c78bac63c213649c3e8c2fa49e9f3c9848d5a