[FFmpeg-trac] #1471(undetermined:new): The creation time in Android video is reported incorrectly.

[FFmpeg]

#1471: The creation time in Android video is reported incorrectly.
-------------------------------------+-------------------------------------
             Reporter:  andreasg     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 The reported creation time for video taken with a Nexus Galaxy phone
 (Android 4.0.2) is off by 66 years.  As far as I can tell, this is due to
 the fact that the start of the epoch is assumed to be Jan 1, 1904 while
 the phone reports it as Jan 1, 1970.

 In libformat/mov.c in function mov_read_mvhd, the version is 0 and the
 32-bit creation time is 1340225911.  In function
 mov_metadata_creation_time, the difference between the two epochs is
 subtracted from the time.

 It is possible that the Android video just doesn't correctly encode the
 time but I still want to report this issue.

 How to reproduce:
 {{{
 % ffprobe VID_20120620_135828.mp4
 ffprobe version N-40739-ge556121 Copyright (c) 2007-2012 the FFmpeg
 developers
   built on May 16 2012 11:07:59 with gcc 4.6.3 20120306 (Red Hat 4.6.3-2)
   configuration:
   libavutil      51. 53.100 / 51. 53.100
   libavcodec     54. 21.101 / 54. 21.101
   libavformat    54.  5.100 / 54.  5.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 74.100 /  2. 74.100
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0. 11.100 /  0. 11.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VID_20120620_135828.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 0
     compatible_brands: isom3gp4
     creation_time   : 1946-06-20 20:58:31
   Duration: 00:00:02.24, start: 0.000000, bitrate: 9159 kb/s
     Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p,
 1280x720, 8460 kb/s, SAR 65536:65536 DAR 16:9, 29.75 fps, 30 tbr, 90k tbn,
 180k tbc
     Metadata:
       creation_time   : 1946-06-20 20:58:31
       handler_name    : VideoHandle
     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, s16,
 96 kb/s
     Metadata:
       creation_time   : 1946-06-20 20:58:31
       handler_name    : SoundHandle
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1471>
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