[FFmpeg-trac] #3842(avformat:new): AAC (mp4a) DASH takes abnormally long to detect (~4 - 6s)

[FFmpeg]

#3842: AAC (mp4a) DASH takes abnormally long to detect (~4 - 6s)
---------------------------------+------------------------------------
             Reporter:  viperfx  |                    Owner:
                 Type:  defect   |                   Status:  new
             Priority:  normal   |                Component:  avformat
              Version:  2.2.4    |               Resolution:
             Keywords:  mov      |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+------------------------------------

Comment (by cehoyos):

 FFmpeg claims it did not read the whole file (less than one quarter), how
 can I reproduce that this is not correct?
 {{{
 $ ffmpeg -loglevel debug -i videoplayback.mp4
 ffmpeg version N-65479-g7117547 Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Aug 10 2014 13:36:46 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      54.  0.100 / 54.  0.100
   libavcodec     56.  0.100 / 56.  0.100
   libavformat    56.  0.100 / 56.  0.100
   libavdevice    56.  0.100 / 56.  0.100
   libavfilter     5.  0.100 /  5.  0.100
   libswscale      3.  0.100 /  3.  0.100
   libswresample   1.  0.100 /  1.  0.100
   libpostproc    53.  0.100 / 53.  0.100
 Splitting the commandline.
 Reading option '-loglevel' ... matched as option 'loglevel' (set logging
 level) with argument 'debug'.
 Reading option '-i' ... matched as input file with argument
 'videoplayback.mp4'.
 Finished splitting the commandline.
 Parsing a group of options: global .
 Applying option loglevel (set logging level) with argument debug.
 Successfully parsed a group of options.
 Parsing a group of options: input file videoplayback.mp4.
 Successfully parsed a group of options.
 Opening an input file: videoplayback.mp4.
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x33f4b20] Format mov,mp4,m4a,3gp,3g2,mj2
 probed with size=2048 and score=100
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x33f4b20] ISO: File Type Major Brand: dash
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x33f4b20] Before avformat_find_stream_info()
 pos: 3374213 bytes read:720896 seeks:21
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x33f4b20] All info found
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x33f4b20] After avformat_find_stream_info()
 pos: 4796 bytes read:753664 seeks:22 frames:1
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'videoplayback.mp4':
   Metadata:
     major_brand     : dash
     minor_version   : 0
     compatible_brands: iso6mp41
     creation_time   : 2014-04-25 14:50:56
   Duration: 00:03:35.03, start: 0.000000, bitrate: 128 kb/s
     Stream #0:0(und), 1, 1/44100: Audio: aac (mp4a / 0x6134706D), 44100
 Hz, stereo, fltp, 125 kb/s (default)
     Metadata:
       creation_time   : 2014-04-25 14:50:56
       handler_name    : SoundHandler
 Successfully opened the file.
 At least one output file must be specified
 [AVIOContext @ 0x33f3be0] Statistics: 753664 bytes read, 22 seeks
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/3842#comment:6>
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