Output from avconv -v 9 -loglevel 99 -i ac3_acodec_hiss.mp4:

$ avconv -v 9 -loglevel 99 -i ac3_acodec_hiss.mp4 
avconv version 0.8-4:0.8-1ubuntu2, Copyright (c) 2000-2011 the Libav developers
  built on Feb  9 2012 08:21:31 with gcc 4.6.2
  configuration: --extra-version='4:0.8-1ubuntu2' --arch=i386 --prefix=/usr --libdir=/usr/lib/i386-linux-gnu --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-libfreetype --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i386-linux-gnu/i686/cmov --cpu=i686 --enable-shared --disable-static
  avutil      configuration: --extra-version='4:0.8.0.1build1' --arch=i386 --prefix=/usr --libdir=/usr/lib/i386-linux-gnu --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-libfreetype --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --shlibdir=/usr/lib/i386-linux-gnu/i686/cmov --cpu=i686 --enable-shared --disable-static
  avcodec     configuration: --extra-version='4:0.8.0.1build1' --arch=i386 --prefix=/usr --libdir=/usr/lib/i386-linux-gnu --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-libfreetype --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --shlibdir=/usr/lib/i386-linux-gnu/i686/cmov --cpu=i686 --enable-shared --disable-static
  avformat    configuration: --extra-version='4:0.8.0.1build1' --arch=i386 --prefix=/usr --libdir=/usr/lib/i386-linux-gnu --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-libfreetype --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --shlibdir=/usr/lib/i386-linux-gnu/i686/cmov --cpu=i686 --enable-shared --disable-static
  swscale     configuration: --extra-version='4:0.8.0.1build1' --arch=i386 --prefix=/usr --libdir=/usr/lib/i386-linux-gnu --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-libfreetype --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --shlibdir=/usr/lib/i386-linux-gnu/i686/cmov --cpu=i686 --enable-shared --disable-static
  postproc    configuration: --extra-version='4:0.8.0.1build1' --arch=i386 --prefix=/usr --libdir=/usr/lib/i386-linux-gnu --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --enable-runtime-cpudetect --enable-libfreetype --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdirac --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libvo-aacenc --enable-version3 --enable-libvo-amrwbenc --enable-version3 --enable-libdc1394 --shlibdir=/usr/lib/i386-linux-gnu/i686/cmov --cpu=i686 --enable-shared --disable-static
  libavutil    51. 21. 0 / 51. 21. 0
  libavcodec   53. 34. 0 / 53. 34. 0
  libavformat  53. 20. 0 / 53. 20. 0
  libavdevice  53.  2. 0 / 53.  2. 0
  libavfilter   2. 15. 0 /  2. 15. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  52.  0. 0 / 52.  0. 0
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x93f3260] Probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x93f3260] ISO: File Type Major Brand: isom
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x93f3260] multiple edit list entries, a/v desync might occur, patch welcome
[h264 @ 0x93f5320] err{or,}_recognition separate: 1; 1
[h264 @ 0x93f5320] err{or,}_recognition combined: 1; 1
[h264 @ 0x93f5320] Unsupported bit depth: 0
[aac @ 0x93f75c0] err{or,}_recognition separate: 1; 1
[aac @ 0x93f75c0] err{or,}_recognition combined: 1; 1
[aac @ 0x93f75c0] Unsupported bit depth: 0
[h264 @ 0x93f5320] no picture
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x93f3260] All info found
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'ac3_acodec_hiss.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf53.20.0
    media_type      : 10
    copyright       : � 2012 British Broadcasting Corporation, all rights reserved
    title           : Rugged Wales
    artist          : BBC One
    album_artist    : BBC TV
    album           : Rugged Wales
    composer        : BBC iPlayer
    genre           : Factual
    comment         : Iolo Williams explores some of the best wild and industrial landscapes in Wales.
    date            : 2012-03-01T20:00:00Z
    description     : Iolo Williams explores some of the best wild and industrial landscapes in Wales.
    show            : Rugged Wales
    episode_id      : b01cywyz
    network         : BBC One
  Duration: 00:58:58.16, start: 0.000000, bitrate: 8 kb/s
    Stream #0.0(und), 1, 1/25: Video: h264 (Main), yuv420p, 832x468 [PAR 117:117 DAR 16:9], 1/50, 1401 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    Stream #0.1(und), 1, 1/48000: Audio: aac, 48000 Hz, stereo, s16, 94 kb/s
At least one output file must be specified