[FFmpeg-trac] #5340(undetermined:closed): ffmpeg with WMV input renders incorrect audio length (with some codecs)

[FFmpeg]

#5340: ffmpeg with WMV input renders incorrect audio length (with some codecs)
-------------------------------------+-------------------------------------
             Reporter:  veganaiZe    |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |  worksforme
Analyzed by developer:  0            |               Blocked By:
                                     |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * status:  reopened => closed
 * resolution:   => worksforme


Comment:

 Replying to [comment:5 veganaiZe]:
 > So should I manually specific the duration?

 You cannot specify the duration: It is just shown as an information for
 the user, FFmpeg ignores it.

 > My playback time matches the "estimated" duration.

 I still cannot reproduce:
 {{{
 $ ffmpeg -i ScreenCapture_2-28-2016\ 12.45.57\ PM.wmv out.aac
 }}}
 {{{
 $ time ffplay -autoexit out.aac
 ffplay version N-79068-g6b7ce0e Copyright (c) 2003-2016 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      55. 19.100 / 55. 19.100
   libavcodec     57. 28.103 / 57. 28.103
   libavformat    57. 28.102 / 57. 28.102
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 39.102 /  6. 39.102
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 [aac @ 0x7fde3c000920] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, aac, from 'out.aac':
   Duration: 00:10:44.61, bitrate: 119 kb/s
     Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 119 kb/s
  591.32 M-A:  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0

 real    9m51.589s
 user    0m12.173s
 sys     0m7.817s
 }}}
 {{{
 $ ffmpeg -i out.aac -f null -
 ffmpeg version N-79068-g6b7ce0e Copyright (c) 2000-2016 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      55. 19.100 / 55. 19.100
   libavcodec     57. 28.103 / 57. 28.103
   libavformat    57. 28.102 / 57. 28.102
   libavdevice    57.  0.101 / 57.  0.101
   libavfilter     6. 39.102 /  6. 39.102
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
   libpostproc    54.  0.100 / 54.  0.100
 [aac @ 0x386c3c0] Estimating duration from bitrate, this may be inaccurate
 Input #0, aac, from 'out.aac':
   Duration: 00:10:44.61, bitrate: 119 kb/s
     Stream #0:0: Audio: aac (LC), 44100 Hz, stereo, fltp, 119 kb/s
 Output #0, null, to 'pipe:':
   Metadata:
     encoder         : Lavf57.28.102
     Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
     Metadata:
       encoder         : Lavc57.28.103 pcm_s16le
 Stream mapping:
   Stream #0:0 -> #0:0 (aac (native) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 size=N/A time=00:09:51.38 bitrate=N/A speed=1.16e+03x
 video:0kB audio:101876kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}
 Which application plays the aac file for ten minutes?

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5340#comment:8>
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