[FFmpeg-trac] #1777(avcodec:new): Wrong duration for a wavpack sample

[FFmpeg]

#1777: Wrong duration for a wavpack sample
---------------------------------+--------------------------------------
             Reporter:  alexk    |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  git-master
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+--------------------------------------
 Summary of the bug:

 ffmpeg shows a (very) wrong duration for a wavpack sample.

 How to reproduce:

 I uploaded the sample to the FTP server as wavpack_bad_duration.wv

 {{{
 % ./ffmpeg -v 9 -loglevel 99 -i wavpack_bad_duration.wv
 ffmpeg version N-44494-ge3a1eb9 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Sep 15 2012 18:34:49 with gcc 4.2.1 (GCC) 20070831 patched
 [FreeBSD]
   configuration:
   libavutil      51. 73.100 / 51. 73.100
   libavcodec     54. 56.100 / 54. 56.100
   libavformat    54. 27.100 / 54. 27.100
   libavdevice    54.  2.100 / 54.  2.100
   libavfilter     3. 16.104 /  3. 16.104
   libswscale      2.  1.101 /  2.  1.101
   libswresample   0. 15.100 /  0. 15.100
 [wv @ 0x8040be400] Format wv probed with size=2048 and score=100
 [wv @ 0x8040be400] File position before avformat_find_stream_info() is 32
 [wv @ 0x8040be400] All info found
 [wv @ 0x8040be400] File position after avformat_find_stream_info() is
 26268
 Input #0, wv, from '/data/tmp/wavpack_bad_duration.wv':
   Duration: 27:03:11.54, start: 0.000000, bitrate: 0 kb/s
     Stream #0:0, 1, 1/44100: Audio: wavpack, 44100 Hz, stereo, s32
 At least one output file must be specified
 [AVIOContext @ 0x8041310c0] Statistics: 65696 bytes read, 3 seeks
 }}}

 wvunpack show the correct duration:

 {{{
 % wvunpack -ss wavpack_bad_duration.wv

  WVUNPACK  Hybrid Lossless Audio Decompressor  FreeBSD Version 4.60.1
  Copyright (c) 1998 - 2009 Conifer Software.  All Rights Reserved.


 file name:         wavpack_bad_duration.wv
 file size:         3122132 bytes
 source:            32-bit ints at 44100 Hz
 channels:          2 (stereo)
 duration:          0:00:30.28
 modalities:        lossless
 compression:       70.77%
 ave bitrate:       825 kbps
 encoder version:   4
 file wrapper:      none (raw audio)
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1777>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker