[FFmpeg-user] MP4 to wav

[Anatoly]

On Sun, 16 Apr 2023 17:37:13 +0000
Carl Zwanzig <cpz at tuunq.com> wrote:

> On 4/13/2023 12:14 AM, Paul B Mahol wrote:
> > It is not mp4 file format.  
> 
> That's right, it's not (don't believe the file extension)--
> Complete name                            : C:/temp/1122.mp4
> Format                                   : MPEG-PS
> File size                                : 1.37 MiB
> Duration                                 : 13 s 937 ms
> Overall bit rate                         : 823 kb/s
> FileExtension_Invalid                    : mpeg mpg m2p vob vro pss
> evo
> 
> Video
> ID                                       : 224 (0xE0)
> Format                                   : HEVC
> Format/Info                              : High Efficiency Video
> Coding Format profile                           : Main at L4.1@Main
> Duration                                 : 13 s 937 ms
> [...]
> 
> Audio
> ID                                       : 192 (0xC0)
> Format                                   : MPEG Audio
> Format version                           : Version 2.5
> Format profile                           : Layer 2
> Format settings                          : Dual mono / Reserved
> Duration                                 : 10 s 600 ms
> Bit rate mode                            : Constant
> Bit rate                                 : 40.0 kb/s
> [...]
> 
> 
> If the file extension is wrong for the contents, it's possible that
> the audio format tagging is also wrong -or- more likely that the OP
Tag is wrong. Is there tag for g722.1 stream exist at all?
> was told G722 while it's really mpeg. It's also possible that there
> was a problem with the original encoding.

so if it is mpeg-ps, let's try
convert mpeg-ts to mpeg-ps (there's no ps2es):
 C:\test>ps2ts -notdvd -h264 1122.mp4 1122.ts
then extract raw G722.1 audio bitstream:
 C:\test>ts2es -audio 1122.ts 1122_g722.raw
then decode from g722.1 to s16le:
 C:\test>decode 0 1122_g722.raw 1122_s16le.raw 16000 7000
then convert from s16le to wav
 C:\test>ffmpeg -f s16le -ar 16000 -i 1122_s16le.raw -c copy 1122.wav
1122.wav plays ok.
Windows versions of ps2ts and ts2es are taken from here
https://sourceforge.net/projects/tstools.berlios/
decode.exe is taken from here: 
http://spectralink.polycom.com/global/downloads/company/about_us/technology/siren14_g7221c/Siren14PCExecutable.zip
Tested under wine, because I have no Windows by hand, and I don't know
any *nix equivalent of g722.1 decode.exe.