<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<font face="monospace">I read and think I understood <br>
</font>
<blockquote><font face="monospace">1) Preserving data and timecode</font><br>
<font face="monospace">2) But unsure what's new about 2) regarding
max quality via usual firewire connection</font><br>
</blockquote>
<font face="monospace">First, this looks to be for Digital Video
(DV/HDV, Digital8 not mentioned) recorded on mini (H)DV tape
cassettes.<br>
And not for Analog Video(?) (VHSC/8mm/S-VHSC/Hi8/S-video) recorded
on tape cassettes the generation before that<br>
<br>
The analog-digital convertersion, i.e Hi8 S-video to DV doesn't
usually preserve the analog recorded date and time code or RCTC.<br>
Not advanced, but better than nothing I therefore used to manually
display (switch on) the time and date at the start of video
sequences.<br>
<br>
Discovered also an old post I have had about TC and RCTC ...<br>
<a class="moz-txt-link-freetext" href="http://www.verycomputer.com/311_d1c132d0a14432ec_1.htm#p7">http://www.verycomputer.com/311_d1c132d0a14432ec_1.htm#p7</a><br>
<br>
</font><br>
<font face="monospace">On Sunday, January 2, 2022, Andrea paz via
Cin <cin at lists.cinelerra-gg.org><br>
wrote:<br>
<br>
> @Andrew-R<br>
> @Terje<br>
> Found this discussion on an Italian NewsGroup; no idea if it
can be<br>
> useful...<br>
><br>
> > 1) How to capture on Hard Disk video-films recorded on
magnetic cassette<br>
> tapes "Mini Dv" without losing the date and time of the
original video<br>
> recording on<br>
> the magnetic tape?<br>
> > 2) And without losing the best quality obtainable by
downloading with<br>
> cable and DV sockets (with digital signals; e.g. with
i.Link, IEEE.1394<br>
> standard)<br>
><br>
><br>
> The two things coincide: date/time data and other information<br>
> (timecode, aspect-ratio, color/BN, DV type [DV25, DV50,
DVCPROHD_1080i,<br>
> DVCPROHD_720p], PAL/NTSC, interlaced/progressive, audio
locked/<br>
> unlocked, aperture, frame rate, etc.<br>
> unlocked, aperture, gain, shutter) are contained in VAUX
blocks of each<br>
> frame.<br>
> VAUX blocks of in each DV frame (to be exact, they could be
contained in<br>
> each<br>
> contained in each DIF block, 12000 bytes, and each frame in
PAL is<br>
> composed of<br>
> composed of 12 DIF blocks, 144000 bytes, but usually they are
put only<br>
> on the first DIF block of the frame), then downloading on PC
the<br>
> digital data of the<br>
> digital data of the MiniDV cassette you also make a backup of
the<br>
> information about<br>
> date/time information.<br>
><br>
> Similarly for HDV (MPEG-2 Transport Stream) data stored on
the MiniDV<br>
> cassette: all this information is contained in packets.<br>
> MiniDV cassette: all this information is contained in Private
Stream<br>
> A1 packages (commonly called Sony A1).<br>
><br>
> > 3) And perhaps by having such data captured in the
"detail-properties"<br>
> of the video files that are created, as is normally the
case with today's<br>
> cameras, instead of seeing them<br>
> cameras of today, instead of seeing them appear inside the
image of the<br>
> video<br>
> when of the image of the video when you watch it on the
monitor?<br>
><br>
> This one is a tad more complicated.... While cameras<br>
> enter this information once into the EXIF/XMP/<br>
> IPTC sections of the JPG/RAW[TIFF] file, for DV video this
information is<br>
> relative to each frame (or inserted on each frame of type I<br>
> or P for HDV videos, i.e. every 3 frames), and so it is a
little bit<br>
> difficult to show you all the information.<br>
> You could show the information of the first frame, but if,
for example, a<br>
> for example, a file was composed by more recordings, that
information<br>
> would be wrong for the recordings<br>
> would be wrong for the recordings following the first one,
not to mention<br>
> that<br>
> diaphragm/gain/shutter could change frame by frame.<br>
> frame by frame.<br>
><br>
> Back in the day (2010, so a bit after 2004...) I had made
available a<br>
> small program to extract data in text format:<br>
><br>
> <a class="moz-txt-link-freetext" href="https://video.liberdomus.org/software/extract_dvaux.zip">https://video.liberdomus.org/software/extract_dvaux.zip</a><br>
><br>
> Just run the program from DOS prompt (or shell unix, they are
also<br>
> compiled for Linux/64bit):<br>
><br>
> extract_dvaux.exe filedv > info.txt<br>
><br>
> The "filedv" can be any file format (AVI, MOV, RAW DV) that
contains<br>
> DV packets (also compatible with the Canopus-DV codec):<br>
> a line is written every time some parameter changes.<br>
> At the end a short report is also written about how many
frames/blocks<br>
> have been analyzed and if the audio is "locked" or not.<br>
> --<br>
> Cin mailing list<br>
> Cin at lists.cinelerra-gg.org<br>
> <a class="moz-txt-link-freetext" href="https://lists.cinelerra-gg.org/mailman/listinfo/cin">https://lists.cinelerra-gg.org/mailman/listinfo/cin</a><br>
></font><br>
</body>
</html>