пт, 2 февр. 2024 г., 20:38 Terje J. Hanssen <[email protected]>:
> > > Den 22.01.2024 17:00, skrev Andrew Randrianasulu: > > > > пн, 22 янв. 2024 г., 18:39 Terje J. Hanssen <[email protected]>: > >> >> >> Den 22.01.2024 15:05, skrev Andrew Randrianasulu: >> >> >> >> пн, 22 янв. 2024 г., 16:18 Terje J. Hanssen <[email protected]>: >> >>> >>> >>> 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)? > I think I will look at python sourcecode of devede-ng to see what it does ... so no need. > >>> 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 > but there is no audioformat for internal conversion, so I guess it only works as 24 or 16 bit ... ? Yes, 20 bit in the description, but there is no way to select it? > 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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