[FFmpeg-user] MP4 to wav

[Paul B Mahol]

On Thu, Apr 13, 2023 at 2:01 AM Anatoly <anatoly at kazanfieldhockey.ru> wrote:

> On Tue, 11 Apr 2023 12:09:32 +0300
> Alexander Gorodetski <alexander.gorodetski at gmail.com> wrote:
>
> > Hello guys,
> >
> > I cannot convert the following file from MP4 format to WAV format. It
> > should be noted that the audio of this MP4 file is encoded with
> > G722.1. It should be noted that the only software that can open and
> > play this file properly is VSPlayer.
> >
> > The MP4 can be downloaded from here:
> >
> https://drive.google.com/file/d/1_JGekhr6byAv7dkLw48LRQIJGMxMu4oh/view?usp=drivesdk
> >
> > Any help will be appreciated.
>
> As I understand it, ffmpeg should be able to decode G722.1, another
> ("code") name for this codec is "Siren"
> atly at asd2:~/work/trash % ffmpeg -codecs | grep siren
> ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
> ...
>  D.AIL. siren                Siren
>
> Theoretically, another way to do it:
> - extract raw G722.1 bitstream from your mp4 file using mp4box
> - convert extracted bitstream to wav/raw using those old windows (I
>   think they should work under wine too) utilities:
>
> http://spectralink.polycom.com/global/downloads/company/about_us/technology/
> But:
> % mp4box -info  1122.mp4
> [iso file] Unknown top-level box type 02010000
> [iso file] Incomplete box 02010000 - start 0 size 1228368384
> [iso file] Incomplete file while reading for dump - aborting parsing
> [iso file] Unknown top-level box type 02010000
> Truncated file - missing 1228368384 bytes
> Error opening file 1122.mp4: IsoMedia File is truncated
>
> According to this
> http://www.mplayerhq.hu/DOCS/codecs-status.html#ac
> Mplayer (and hence mencoder) should be able to decode G722.1 not only
> using "ffmpeg siren audio codec", but, under windows, also using
> sirenacm.dll and vivog723.acm.
> Yet again (even beind told to play video only):
> % mplayer -nosound 1122.mp4
> MPlayer SVN-r38192-snapshot-10.0.1 (C) 2000-2020 MPlayer Team
> Playing 1122.mp4.
> libavformat version 58.45.100 (external)
> MPEG-PS file format detected.
> MPEG: FATAL: EOF while searching for sequence header.
> Video: Cannot read properties.
> No stream found.
> Exiting... (End of file)
>

It is not mp4 file format.

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