[FFmpeg-devel] Fwd: patch for 44.1/32 khz pcm input in pcm dvd encoder

[Marth64]

Hi Andrew,

Sorry, it took me some time to author DVDs to test this but I finally got
around to it.
DVD player # 1 (DVD only) -- pass for both 32k and 44.1k
DVD player # 2 (4K/BD/DVD) -- pass for both 32k and 44.1k

Interestingly, DVD player # 2 OSD showed sample rate as 48k but anyways it
played fine.
So, I agree this is supported most likely transparently by the decoder
chipset itself.

WRT the patch itself.  I noticed there is an indentation issue in the
switch statement, and it did not apply automatically on latest master. I
had to modify it to apply.
I do not have permission to merge patches but I imagine this will be more
likely to get merged with those 2 things fixed.

out of curiosity, how did you get the constant values ? (44.1 = 2, 32 = 3).
I would like to implement this as well in to the DVD demuxer, since
apparently it is possible to do.

Thanks for sharing.
Respectfully,



On Tue, Jan 30, 2024 at 11:41 PM Andrew Randrianasulu <
randrianasulu at gmail.com> wrote:

> ср, 31 янв. 2024 г., 04:49 Andrew Randrianasulu <randrianasulu at gmail.com>:
>
> >
> >
> > вт, 30 янв. 2024 г., 23:21 Marth64 <marth64 at proxyid.net>:
> >
> >>  Interesting, thanks. My thought was to see if this is allowed for
> >> DVD-Video vs DVD-Audio only which are different application layer. I can
> >> try to run a PS2 test with the real hardware out of curiosity later.
> >>
> >
> > Thanks!
> >
> >
> > I also found Cirrus Logic application note from 2001 that mentions 32khz
> > pcm operation. Yet it looks more like external amplifier/decoder part,
> not
> > something integrated into dvd player itself? (input stream via S/PDIF)
> >
> > https://pdf.dzsc.com/88889/28162.pdf
> >
>
>
> https://tascam.com/downloads/tascam/78/DV-D01U_Manual.pdf
>
> also this pdf lists dvd pcm 44.1 in table at p. 30.
>
> No sights of 32khz, but surprizingly hdmi can carry such low frequency
> sampled sounds!
>
> >
> >
> >
> >
> >> On Tue, Jan 30, 2024 at 2:17 PM Andrew Randrianasulu <
> >> randrianasulu at gmail.com> wrote:
> >>
> >> > пн, 29 янв. 2024 г., 22:08 Andrew Randrianasulu <
> >> randrianasulu at gmail.com>:
> >> >
> >> > > On Mon, Jan 29, 2024 at 8:16 PM Marth64 <marth64 at proxyid.net>
> wrote:
> >> > > >
> >> > > > Hi,  out of curiosity, I did not know 44.1/32 is supported on DVD
> >> PCM.
> >> > > Does
> >> > > > this type of output work on an actual DVD player?
> >> > >
> >> >
> >> >
> >> > At least this pdf brochure lists 44.1 under PCM:
> >> >
> >> >
> >> >
> >>
> https://at.yamaha.com/files/download/other_assets/8/333768/DVD-S1500_e_U.pdf
> >> >
> >> >
> >> > > We try to determinate this, but unfortunately new DVD  players a bit
> >> > > TOO flexible and forgiving?
> >> > >
> >> > >
> https://lists.cinelerra-gg.org/pipermail/cin/2024-January/007907.html
> >> > >
> >> > > I even had idea to use PS2 emulator to check (DVD video supposed to
> >> > > work there  since some  time)
> >> > > but ran into qt6 being  build  dependency ... so I shelved this idea
> >> for
> >> > > now
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >  Thank you
> >> > > >
> >> > > > On Mon, Jan 22, 2024 at 3:59 AM Andrew Randrianasulu <
> >> > > > randrianasulu at gmail.com> wrote:
> >> > > >
> >> > > > > ---------- Forwarded message ---------
> >> > > > > От: Andrew Randrianasulu <randrianasulu at gmail.com>
> >> > > > > Date: вс, 21 янв. 2024 г., 06:49
> >> > > > > Subject: patch for 44.1/32 khz pcm input in pcm dvd encoder
> >> > > > > To: FFmpeg user questions <ffmpeg-user at ffmpeg.org>,
> Cinelerra.GG
> >> <
> >> > > > > cin at lists.cinelerra-gg.org>
> >> > > > >
> >> > > > >
> >> > > > > relative to ffmpeg.git commit
> >> > 6c4388b468bf92c0c1e7733c6cfe4ff3f9ca9723
> >> > > > >
> >> > > > > lightly tested with mpv and mediainfo like this:
> >> > > > >
> >> > > > > ./ffmpeg -i ~/f9518976.mp4 -target pal-dvd -ar 44100 -c:a
> pcm_dvd
> >> -f
> >> > > dvd
> >> > > > > t.mpg
> >> > > > >
> >> > > > > mpv plays sound correctly, mediainfo does not know those
> >> frequencies
> >> > > and
> >> > > > > display 0khz. ;)
> >> > > > >
> >> > > > >
> >> > > > > ====
> >> > > > >
> >> > > > > forwarded to ffmpeg-devel as requested.
> >> > > > > _______________________________________________
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> >> > > > > ffmpeg-devel at ffmpeg.org
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> >> > > > >
> >> > > > > To unsubscribe, visit link above, or email
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> >> > > > >
> >> > > > _______________________________________________
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