[Cin] qctools, sonic lineup

Mon Jan 22 15:05:48 CET 2024

пн, 22 янв. 2024 г., 16:18 Terje J. Hanssen <terjejhanssen at gmail.com>:

>
>
> Den 20.01.2024 23:31, skrev Andrew Randrianasulu:
>
> Sorry Terje if I was too rough in my previous email.
>
>
> Oh, I am fine with that. I understand also some user-repeating questions
> might be somewhat frustrating :)
> Some of the things like anamorphic video and SAR, are issues from the past
> - to my surprise.
>
>
>
> 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(?)
>
> 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?

Did you tried to run dvdauthor on ffmpeg-encoded and muxed mpg with lpcm
audio?

> ffmpeg -hide_banner -i dv01_07.dv -f dvd -target pal-dvd -aspect 4:3 -b:v
> 8M -mbd rd -trellis 1 -cmp 0 -subcmp 2 -c:a pcm_dvd dvd01_07_pcm.mpg
>
> [dv @ 0x55d83fb616c0] Estimating duration from bitrate, this may be
> inaccurate
> Input #0, dv, from 'dv01_07.dv':
>   Metadata:
>     timecode        : 01:09:35:09
>   Duration: 00:01:53.28, start: 0.000000, bitrate: 28800 kb/s
>   Stream #0:0: Video: dvvideo, yuv420p, 720x576 [SAR 16:15 DAR 4:3], 25000
> kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
>   Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
> Multiple -c, -codec, -acodec, -vcodec, -scodec or -dcodec options
> specified for stream 1, only the last option '-c:a pcm_dvd' will be used.
> Stream mapping:
>   Stream #0:0 -> #0:0 (dvvideo (native) -> mpeg2video (native))
>   Stream #0:1 -> #0:1 (pcm_s16le (native) -> pcm_dvd (native))
> Press [q] to stop, [?] for help
> Output #0, dvd, to 'dvd01_07_pcm.mpg':
>   Metadata:
>     timecode        : 01:09:35:09
>     encoder         : Lavf58.76.100
>   Stream #0:0: Video: mpeg2video (Main), yuv420p(bottom coded first
> (swapped)), 720x576 [SAR 16:15 DAR 4:3], q=2-31, 8000 kb/s, 25 fps, 90k tbn
>     Metadata:
>       encoder         : Lavc58.134.100 mpeg2video
>     Side data:
>       cpb: bitrate max/min/avg: 9000000/0/8000000 buffer size: 1835008
> vbv_delay: N/A
>   Stream #0:1: Audio: pcm_dvd, 48000 Hz, stereo, s16, 1536 kb/s
>     Metadata:
>       encoder         : Lavc58.134.100 pcm_dvd
> frame= 2832 fps=149 q=2.0 Lsize=  132450kB time=00:01:53.27
> bitrate=9578.8kbits/s speed=5.95x
> video:108950kB audio:21272kB subtitle:0kB other streams:0kB global
> headers:0kB muxing overhead: 1.711336%
>
>
>
> Not sure how good internal ffmpeg muxer for dvd file creation, but you
> probably can test this by reusing cingg created audio and video files from
> dvd master.
>
> I have few more ideas to test and smart-up our bash script so it will use
> wav output + sox + mplex automatically if wav or pcm file was detected in
> output directory (so you can set easy wav output and do not care about BE
> pcm file and its extension), but again I need some time to test this.
>
> I was looking for some quality control tools and found qctools and this
> post specifically on stackexchange
>
>
> https://sound.stackexchange.com/questions/40222/show-the-differences-between-two-similar-audio-files-using-graphical-method
>
> it mentions  program named Sonic Lineup, hopefully easy (and working on
> Linux) way to compare two audio files.
>
> Not sure if it supports dvd audio tho ....
>
> https://sonicvisualiser.org/sonic-lineup/index.html
>
> qctools are more aiming at video quality metrics, just build their latest
> tool:
>
> https://mediaarea.net/QCTools
>
> I am sure you can get Appimage or even rpm from their site.
>
>
>
>
>
>
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