[FFmpeg-user] LPCM in DVD - 44.1/32khz sample rate?

[Andrew Randrianasulu]

On Sun, Jan 21, 2024 at 2:47 PM Paul B Mahol <onemda at gmail.com> wrote:
>
> /* no traces of 44100 and 32000Hz in any commercial software or player */

well, but mpv (and vlc?) supports it ....

>
> On Sun, Jan 21, 2024 at 3:44 AM Andrew Randrianasulu <
> randrianasulu at gmail.com> wrote:
>
> > According to this source (vlc) lpcm dvd audio supports lower frequencies
> > like 44100/32000 hz - useful for direct dv transcoding for example ....
> >
> > https://github.com/videolan/vlc/blob/master/modules/codec/lpcm.c
> >
> > see lines 524, 608
> >
> > Does this mean that libavcodec/pcm-dvdenc.c can be trivially extended to
> > support those ?
> >
> > Same question for mplex. (it only supports 48/96 khz lpcm audio).
> >
> > I also found this table via mjpeg-users archives:
> >
> > https://dvd.sourceforge.net/dvdinfo/lpcm.html
> >
> > it lists dynamic range/gain (?) setting equations.
> >
> > Not mplex nor ffmpeg support setting this to anything but hardcoded 0x80
> >
> > This might be source of my "too loud" lpcm dvd experiments because I was
> > making lpcm file via cinelerra-gg's raw pcm output format (using libsndfile
> > internally).
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