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

[Andrew Randrianasulu]

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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>> > > > >
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>> > > > >
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