cannot seek in .m4a file

[Carl Eugen Hoyos]

(issue 1952)
I will upload a m4a sample that cannot be seeked with ffplay, ffmpeg and mplayer -demuxer lavf.

$ ffmpeg -i Nic\ Chagall\ -\ Get\ The\ Kicks\ Podcast\ 001.m4a
ffmpeg version N-42619-g6b7849e Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul 19 2012 08:58:35 with gcc 4.3.2
  configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl --enable-libopenjpeg --enable-libvorbis --enable-libspeex --enable-libmp3lame --enable-libtheora --extra-ldflags=-lm --enable-libvpx --enable-libxavs --enable-x11grab --enable-libass
  libavutil      51. 65.100 / 51. 65.100
  libavcodec     54. 41.100 / 54. 41.100
  libavformat    54. 17.100 / 54. 17.100
  libavdevice    54.  1.100 / 54.  1.100
  libavfilter     3.  2.100 /  3.  2.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[png @ 0x909f560] Missing png signature
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x90764e0] max_analyze_duration 5000000 reached at 5015510
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x90764e0] decoding for stream 4 failed
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x90764e0] Could not find codec parameters for stream 4 (Video: png): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Nic Chagall - Get The Kicks Podcast 001.m4a':
  Metadata:
    major_brand     : M4A
    minor_version   : 0
    compatible_brands: M4A mp42isom
    creation_time   : 1940-02-17 09:46:08
    title           : Nic Chagall - Get The Kicks Podcast 001
    artist          : Nic Chagall
    album           : Nic Chagall - Get The Kicks
    encoder         : Podcast Maker 1.4.0 by Lemonz Dream
    description     : Episode 001
    synopsis        : Get The Kicks is broadcast live on ah.fm every fourth Monday of the month.
                    :
                    : For more info, visit www.nicchagall.de
    genre           : Podcast
    gapless_playback: 0
    date            : 2009-10-04T13:54:28Z
    season_number   : 0
    episode_sort    : 0
    media_type      : 0
  Duration: 01:00:16.55, start: 0.000000, bitrate: 131 kb/s
    Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 129 kb/s
    Metadata:
      creation_time   : 1940-02-17 09:46:08
      handler_name    : ?Apple Alias Data Handler
    Stream #0:1(eng): Subtitle: mov_text (text / 0x74786574)
    Metadata:
      creation_time   : 1940-02-17 09:46:08
      handler_name    : ?Apple Alias Data Handler
    Stream #0:2(eng): Video: mjpeg (jpeg / 0x6765706A), yuvj444p, 600x600 [SAR 1:1 DAR 1:1], 0 kb/s, SAR 40:37 DAR 40:37, 0k fps, 0k tbr, 44100 tbn, 44100 tbc
    Metadata:
      creation_time   : 1940-02-17 09:46:08
      handler_name    : ?Apple Alias Data Handler
    Stream #0:3(eng): Subtitle: mov_text (tx3g / 0x67337874)
    Metadata:
      creation_time   : 1940-02-17 09:46:08
      handler_name    : ?Apple Alias Data Handler
    Stream #0:4: Video: png, 90k tbr, 90k tbn, 90k tbc
At least one output file must be specified

[Carl Eugen Hoyos]

Sample uploaded to ​http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket1559/Nic%20Chagall%20-%20Get%20The%20Kicks%20Podcast%20001.m4a

[compn]

seek works with -vn