[Cin] qctools, sonic lineup

[Andrew Randrianasulu]

пт, 2 февр. 2024 г., 20:38 Terje J. Hanssen <terjejhanssen at gmail.com>:

>
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> Den 22.01.2024 17:00, skrev Andrew Randrianasulu:
>
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> пн, 22 янв. 2024 г., 18:39 Terje J. Hanssen <terjejhanssen at gmail.com>:
>
>>
>>
>> Den 22.01.2024 15:05, skrev Andrew Randrianasulu:
>>
>>
>>
>> пн, 22 янв. 2024 г., 16:18 Terje J. Hanssen <terjejhanssen at 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)?
>


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?"
>
>
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> 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 at 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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