[FFmpeg-trac] #6622(undetermined:new): Doesn't support wav files completely - incorrect time length reported
FFmpeg
trac at avcodec.org
Mon Aug 28 12:59:33 EEST 2017
#6622: Doesn't support wav files completely - incorrect time length reported
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Reporter: nemo | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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(FFmpeg <- LAVFilters <- MPC-HC)
It doesn't report the time length correctly on some wav files.
Example:
https://mega.nz/#!YuomER6Y!YNkShluWwT47YI085AS170xTbV_seFFfpbtC_7tLMfU
Time length is 11:42 according to VLC.
MPC-HC reports itime length as 03:43 however when it reaches that time it
continues to play.
The example was downloaded 2017-08-18 and is free this month.
More can be found here: http://www.mysurround.com/en/catalog-free-titles
(Creating an account is free).
{{{
MPC-HC (64-bit)
---------------
Build information:
Version: 1.7.13 (e37826845)
Compiler: MSVC v19.00.24215.01
Build date: Jul 16 2017 18:47:17
LAV Filters:
LAV Splitter: 0.70.2.1
LAV Video: 0.70.2.1
LAV Audio: 0.70.2.1
FFmpeg compiler: MinGW-w64 GCC 7.1.0
Operating system:
Name: Windows NT 6.1 (build 7601, Service Pack 1)
Version: 6.1 (64-bit)
}}}
Reference: [https://github.com/Nevcairiel/LAVFilters/issues/151]
mkver said:
"This is ac3 muxed in a wave container (if you look at the file in an hex
editor, you will find many 0x00 in it (this is also the reason why this
file is so compressibly); also, there seems to be an endianness swap on
the ac3 data, but I actually don't know the specification of ac3 in wav).
The 11:42 reported by VLC is also wrong: The real length is 3:24.768. This
seems to be a bug in ffmpeg (or a limitation of ac3 in wav) and should be
reported there. LAVFilters will inherit the fix for it (if it gets
fixed)."
--
Ticket URL: <https://trac.ffmpeg.org/ticket/6622>
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