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?
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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