[FFmpeg-trac] #7284(undetermined:new): Converting from .WAV (PCM) to .MP4 with -acodec copy produces unplayable output
FFmpeg
trac at avcodec.org
Wed Jun 27 13:47:15 EEST 2018
#7284: Converting from .WAV (PCM) to .MP4 with -acodec copy produces unplayable
output
-------------------------------------+-------------------------------------
Reporter: death | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
{{{
% ffmpeg -i somewav.wav -acodec copy output.mp4
ffmpeg version 4.0-tessus Copyright (c) 2000-2018 the FFmpeg developers
built with Apple LLVM version 9.1.0 (clang-902.0.39.1)
(...)
}}}
The produced file cannot be decoded by FFmpeg:
{{{
% ffmpeg -i output.mp4 decoded.wav
(...)
Decoder (codec none) not found for input stream #0:0
}}}
Additionally, nonsensical info appears to be written to MP4 headers
regarding the channel count in the stream, the MP4 file sourced from a
mono WAV has this:
{{{
Stream #0:0(und): Audio: none ([1][0][0][0] / 0x0001), 11025 Hz, stereo
(default)
}}}
Yet the data within it is most definitely mono.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7284>
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