[FFmpeg-trac] #7904(undetermined:new): Can not convert webm to wav

[FFmpeg]

#7904: Can not convert webm to wav
-------------------------------------+-------------------------------------
             Reporter:  tesla90      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Hi,

 I am using ffmpeg on Windows 10 64 bit.

 Ffmpeg version is:

 {{{
 ffmpeg version N-93863-g58d167bcd5 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 8.3.1 (GCC) 20190414
 }}}

 Below command:

 {{{
 ./ffmpeg.exe -i /c/Users/username/Desktop/test_quality/webm.webm -vn
 -acodec copy /c/Users/username/Desktop/test_quality/wav-copy.wav
 }}}

 gives this error output:

 {{{
 ffmpeg version N-93863-g58d167bcd5 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 8.3.1 (GCC) 20190414
   configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
 fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-
 libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame
 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
 --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
 --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack
 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-
 libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
 --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx
 --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-
 nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
   libavutil      56. 27.100 / 56. 27.100
   libavcodec     58. 52.101 / 58. 52.101
   libavformat    58. 27.103 / 58. 27.103
   libavdevice    58.  7.100 / 58.  7.100
   libavfilter     7. 53.100 /  7. 53.100
   libswscale      5.  4.101 /  5.  4.101
   libswresample   3.  4.100 /  3.  4.100
   libpostproc    55.  4.100 / 55.  4.100
 Input #0, matroska,webm, from
 'C:/Users/username/Desktop/test_quality/webm.webm':
   Metadata:
     encoder         : google/video-file
   Duration: 01:13:42.22, start: -0.007000, bitrate: 134 kb/s
     Stream #0:0(eng): Audio: opus, 48000 Hz, stereo, fltp (default)
 File 'C:/Users/username/Desktop/test_quality/wav-copy.wav' already exists.
 Overwrite ? [y/N] y
 [wav @ 000001b3c810ae40] opus codec not supported in WAVE format
 Could not write header for output file #0 (incorrect codec parameters ?):
 Function not implemented
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
     Last message repeated 1 times
 }}}

 It gives "opus codec not supported in WAVE format". But this one works:

 {{{
 ./ffmpeg.exe -i /c/Users/username/Desktop/test_quality/webm.webm
 /c/Users/username/Desktop/test_quality/wav-copy.wav
 }}}

 But I want to use "-acodec copy" because I want to lose quality from the
 audio. this media is very very important for me.

 My questions here:
 1- What should I try to solve "opus codec not supported in WAVE format"
 problem?
 2- If I will use below command, will I lose from quality?

 {{{
 ./ffmpeg.exe -i /c/Users/username/Desktop/test_quality/webm.webm
 /c/Users/username/Desktop/test_quality/wav-copy.wav
 }}}

 Thanks in advance

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7904>
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