Den 22.01.2024 17:00, skrev Andrew Randrianasulu:
пн, 22 янв. 2024 г., 18:39 Terje J. Hanssen <terjejhans...@gmail.com>:
Den 22.01.2024 15:05, skrev Andrew Randrianasulu:
пн, 22 янв. 2024 г., 16:18 Terje J. Hanssen
<terjejhans...@gmail.com>:
Den 20.01.2024 23:31, skrev Andrew Randrianasulu:
I am definitely very much want to have as error-free
transcode (and as little transcode as possible in general)
as you, for same reason.
I am not sure you can absolutely trust ffmpeg for not doing
any conversion by default. For example 6.1 seems to
upconvert 16 bit audio when you select dvd_pcm audio output.
/dev/shm/ffmpeg/ffmpeg -i /home/guest/CIN51.mp4 -target
pal-dvd -c:a pcm_dvd -f dvd /dev/shm/cin51.mpeg
ah, it only does so if decoder output floats by default
(aac, may be mp3 too?)
for dv it was 16 to 16.
I haven't succeeded to get DeVeDe to author DVD and create
iso again from the ffmpeg encoded and muxed mpg with 16-bit
lpcm from dv input. No error from ffmpeg and ok playback of
the mpg using VLC. So it is possibly or seemingly working(?)
Just to add here that DevedeNG "works fine again" without re-encoding
from ffmpeg mpg, as possibly seen my DVD posts lately. If I did note my
previous procedure wrongly or they have changed its behavior, I don't
know. The important thing is on its <Misc> tab to select
*This file is already a DVD/xCD-suitable MPEG-PS file
o
*Keep default: Use a GOP of 12 frames (improves compatibility)
If it may be of interest to see how DevedeNG manges this, I can possibly
attach its debug log (long)?
My follow-up question is if it possible in some way to "feed
or code" a similar command line to FFmpeg in CinGG's DVD
Create window, and possibly get the DVD structure and iso
from this mpg?
I was trying to make this happen, but while ffmpeg shows no error
on muxing - next stage (dvdauthor) reports some warnings and
more importantly resulted iso folder not seekable when played by
mpv (mplex muxed one works).
So I am stuck a bit on using ffmpeg as dvd muxer ... May be if we
let it encode both audio and video in one pass result will be
more satisfactory?
"The question here is if pcm_dvd audio has been changed or "transcoded"
from "PCM signed 20|24-bit big-endian" to 16 bits?"
I think ffmpeg 6.1 defaulted to s32 audio conversion by default. So if
input was 24 bit or float it should be encoded as 24bit dvd pcm audio.
20 bit probably still not plumbed in inside ffmpeg correctly.
Lately I have got and use ffmpeg 6.1.1 from Packman on Leap 15.5
S | Name | Type | Version | Arch | Repository
---+----------+-------+---------------------+--------+-----------
i+ | ffmpeg-6 | pakke | 6.1.1-150500.3.pm.2 | x86_64 | Packman
Queyring about pcm_dvd and pcm_bluray verify that the
encoder/decoder/codecs at least now have support for 16|20|24-bit big-endian
ffmpeg -hide_banner -encoders | egrep "dvd|bluray"
A....D pcm_bluray PCM signed 16|20|24-bit big-endian for
Blu-ray media
A....D pcm_dvd PCM signed 16|20|24-bit big-endian for
DVD media
S..... dvdsub DVD subtitles (codec dvd_subtitle)
ffmpeg -hide_banner -decoders | egrep "dvd|bluray"
A....D pcm_bluray PCM signed 16|20|24-bit big-endian for
Blu-ray media
A....D pcm_dvd PCM signed 16|20|24-bit big-endian for
DVD media
S..... dvdsub DVD subtitles (codec dvd_subtitle)
S..... microdvd MicroDVD subtitle
terje@localhost:~>
ffmpeg -hide_banner -codecs | egrep "dvd|bluray"
DEAI.S pcm_bluray PCM signed 16|20|24-bit big-endian for
Blu-ray media
DEAI.S pcm_dvd PCM signed 20|24-bit big-endian
..D... dvd_nav_packet DVD Nav packet
DES... dvd_subtitle DVD subtitles (decoders: dvdsub)
(encoders: dvdsub)
D.S... microdvd MicroDVD subtitle
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