[FFmpeg-user] LPCM in DVD - 44.1/32khz sample rate?
Andrew Randrianasulu
randrianasulu at gmail.com
Sun Jan 21 04:43:57 EET 2024
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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