[Cin] Analog DV Capture

Terje J. Hanssen terjejhanssen at gmail.com
Tue Jan 4 03:34:55 CET 2022

I read and think I understood

    1) Preserving data and timecode
    2) But unsure what's new about 2) regarding max quality via usual
    firewire connection

First, this looks to be for Digital Video (DV/HDV, Digital8 not 
mentioned) recorded on mini (H)DV tape cassettes.
And not for Analog Video(?) (VHSC/8mm/S-VHSC/Hi8/S-video) recorded on 
tape cassettes the generation before that

The analog-digital convertersion, i.e Hi8 S-video to DV doesn't usually 
preserve the analog recorded date and time code or RCTC.
Not advanced, but better than nothing I therefore used to manually 
display (switch on) the time and date at the start of video sequences.

Discovered also an old post I have had about TC and RCTC ...

On Sunday, January 2, 2022, Andrea paz via Cin <cin at 

 > @Andrew-R
 > @Terje
 > Found this discussion on an Italian NewsGroup; no idea if it can be
 > useful...
 > > 1) How to capture on Hard Disk video-films recorded on magnetic 
 > tapes  "Mini Dv" without losing the date and time of the original video
 > recording on
 >  the magnetic tape?
 > > 2) And without losing the best quality obtainable by downloading with
 > cable and  DV sockets (with digital signals; e.g. with i.Link, IEEE.1394
 > standard)
 > The two things coincide: date/time data and other information
 > (timecode, aspect-ratio, color/BN, DV type [DV25, DV50, DVCPROHD_1080i,
 > DVCPROHD_720p], PAL/NTSC, interlaced/progressive, audio locked/
 > unlocked, aperture, frame rate, etc.
 > unlocked, aperture, gain, shutter) are contained in VAUX blocks of each
 > frame.
 > VAUX blocks of in each DV frame (to be exact, they could be contained in
 > each
 > contained in each DIF block, 12000 bytes, and each frame in PAL is
 > composed of
 > composed of 12 DIF blocks, 144000 bytes, but usually they are put only
 > on the first DIF block of the frame), then downloading on PC the
 > digital data of the
 > digital data of the MiniDV cassette you also make a backup of the
 > information about
 > date/time information.
 > Similarly for HDV (MPEG-2 Transport Stream) data stored on the MiniDV
 > cassette: all this information is contained in packets.
 > MiniDV cassette: all this information is contained in Private Stream
 > A1 packages (commonly called Sony A1).
 > > 3) And perhaps by having such data captured in the "detail-properties"
 > of the   video files that are created, as is normally the case with 
 > cameras, instead of seeing them
 > cameras of today, instead of seeing them appear inside the image of the
 > video
 > when of the image of the video when you watch it on the monitor?
 > This one is a tad more complicated.... While cameras
 > enter this information once into the EXIF/XMP/
 > IPTC sections of the JPG/RAW[TIFF] file, for DV video this information is
 > relative to each frame (or inserted on each frame of type I
 > or P for HDV videos, i.e. every 3 frames), and so it is a little bit
 > difficult to show you all the information.
 > You could show the information of the first frame, but if, for example, a
 > for example, a file was composed by more recordings, that information
 > would be wrong for the recordings
 > would be wrong for the recordings following the first one, not to mention
 > that
 > diaphragm/gain/shutter could change frame by frame.
 > frame by frame.
 > Back in the day (2010, so a bit after 2004...) I had made available a
 > small program to extract data in text format:
 > https://video.liberdomus.org/software/extract_dvaux.zip
 > Just run the program from DOS prompt (or shell unix, they are also
 > compiled for Linux/64bit):
 > extract_dvaux.exe filedv > info.txt
 > The "filedv" can be any file format (AVI, MOV, RAW DV) that contains
 > DV packets (also compatible with the Canopus-DV codec):
 > a line is written every time some parameter changes.
 > At the end a short report is also written about how many frames/blocks
 > have been analyzed and if the audio is "locked" or not.
 > --
 > Cin mailing list
 > Cin at lists.cinelerra-gg.org
 > https://lists.cinelerra-gg.org/mailman/listinfo/cin
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