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Re: [Cin] [FFmpeg-user] LPCM in DVD - 44.1/32khz sample rate?
by Andrew Randrianasulu 21 Jan '24

21 Jan '24

On Sun, Jan 21, 2024 at 2:47 PM Paul B Mahol <onemda(a)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(a)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). > > _______________________________________________ > > ffmpeg-user mailing list > > ffmpeg-user(a)ffmpeg.org > > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > To unsubscribe, visit link above, or email > > ffmpeg-user-request(a)ffmpeg.org with subject "unsubscribe". > > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user(a)ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-request(a)ffmpeg.org with subject "unsubscribe".

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sox to lpcm
by Andrew Randrianasulu 21 Jan '24

21 Jan '24

command line: sox /dev/shm/dvd_20240120-153459/dvd.wav -V -t raw -x /dev/shm/dvd_20240120-153459/dvd-1.lpcm I set output file to different name so I can compare pcm directly produced by cingg and sox-converted version. detailed output: sox /dev/shm/dvd_20240120-153459/dvd.wav -V -t raw -x /dev/shm/dvd_20240120-153459/dvd-1.lpcm sox: SoX v14.4.2 sox INFO formats: detected file format type `wav' Input File : '/dev/shm/dvd_20240120-153459/dvd.wav' Channels : 2 Sample Rate : 48000 Precision : 24-bit Duration : 00:01:00.00 = 2880000 samples ~ 4500 CDDA sectors File Size : 17.3M Bit Rate : 2.30M Sample Encoding: 24-bit Signed Integer PCM Endian Type : little Reverse Nibbles: no Reverse Bits : no sox INFO sox: Overwriting `/dev/shm/dvd_20240120-153459/dvd-1.lpcm' sox INFO formats: `/dev/shm/dvd_20240120-153459/dvd-1.lpcm': overriding machine byte-order Output File : '/dev/shm/dvd_20240120-153459/dvd-1.lpcm' (raw) Channels : 2 Sample Rate : 48000 Precision : 24-bit Duration : 00:01:00.00 = 2880000 samples ~ 4500 CDDA sectors Sample Encoding: 24-bit Signed Integer PCM Endian Type : big Reverse Nibbles: no Reverse Bits : no Comment : 'Processed by SoX' sox INFO sox: effects chain: input 48000Hz 2 channels sox INFO sox: effects chain: output 48000Hz 2 channels ===== so, modern sox (-w/-s options were deprecated and replaced by others - thankfully we do not need them if input file autodetected) can process wav files into lpcm suitable for mplex So, guide is much simpler in sense in cingg you just change audio to wav/24 bits, then run sox, and change mplex line to one including -L freq:channels:bits specification. May be you can even prepare text patch and apply it to dvd.sh ? Oh, and in case of 24-bit audio at 48 khz you definitely want to lower your video bitrate ...

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removal from Cin list
by Roberto Carisio 21 Jan '24

21 Jan '24

I would like to be removed fromcin(a)lists.cinelerra-gg.org . I tried but I can't. Thank you -- Roberto Carisio roberto.carisio(a)gmail.com

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patch for 44.1/32 khz pcm input in pcm dvd encoder
by Andrew Randrianasulu 21 Jan '24

21 Jan '24

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. ;)

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LPCM in DVD - 44.1/32khz sample rate?
by Andrew Randrianasulu 21 Jan '24

21 Jan '24

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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Sox and mplex
by Andrew Randrianasulu 21 Jan '24

21 Jan '24

Canonical way to use mplex with lpcm sound seems to involve sox https://marc.info/?l=mjpeg-users&m=112004582102258&w=2 ==== 1. sox NAME.wav -t raw -x -s -w -c2 -r48000 NAME.lpcm 2. mplex -S 0 -f 8 -V -o NAME.mpg NAME.lpcm NAME.m2v === I also found at mjpeg-users list this utility that makes wavs into lpcm http://dvd-audio.sourceforge.net/wav2lpcm.tar.gz only 48/96 khz, 16/24bits stereo wavs are supported Also, this little table suggest there IS dynamic range bit in lpcm header https://dvd.sourceforge.net/dvdinfo/lpcm.html dynamic_range X 3 X High 3 bits of byte. dynamic_range Y 5 Y Lower 5 bits of byte linear gain = 2^(4-(X+(Y/30))) in dB gain = 24.082 - 6.0206 X - 0.2007 Y Also, according to this post 24-bit lpcm worked around mjpegtools-1.8.0 release: https://marc.info/?l=mjpeg-users&m=112912922124144&w=2 all this quite theoretical at this point, not tried it yet.

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video on LPCM DVD from DV method
by Andrew Randrianasulu 20 Jan '24

20 Jan '24

https://youtu.be/-NE2LZsVUjo grand total of two and half minutes at whooping 5 fps.

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attempt at fixing too loud sound with raw pcm output
by Andrew Randrianasulu 20 Jan '24

20 Jan '24

try andy dv test file, render only audio as Big Endian, Signed, 16 bits. Load it back and watch too loud audio. note: wav file not tested

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SD 16:9 missing among CinGG BD-Render Video Formats
by Terje J. Hanssen 19 Jan '24

19 Jan '24

According to wikipedia, 16:9 SD video formats are also valid BD-Video formats https://en.wikipedia.org/wiki/Blu-ray#Video SD 720 × 480 29.97i 4:3 or 16:9[d] (anamorhic) 720 × 576 25i 4:3 or 16:9[d] The Create BD Format contains 720 x 576/ 25i/p and 720 x 480/ 29.97i/p Please verify if this these are SD 4:3 only? The wikipedia table lists only SD interlaced as valid SD BD-Video format If so, SD 16:9 interlaced are missing, while SD progressive are invalid?

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small cleanup patch for filedv.h
by Andrew Randrianasulu 19 Jan '24

19 Jan '24

according to my grep-fu this define not used anywhere, probably remnant from some cinelerra-cv era experiments in using ffmpeg for dv (today we can do the same directly) grep DV_USE_FFMPEG cinelerra/* grep: cinelerra/data: Это каталог cinelerra/filedv.h:#ifdef DV_USE_FFMPEG grep: cinelerra/i686: Это каталог grep: cinelerra/tests: Это каталог

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