[Cin] Analog DV Capture

Andrew Randrianasulu randrianasulu at gmail.com
Sun Jan 2 23:01:26 CET 2022

interesting info, thanks!

On Sunday, January 2, 2022, Andrea paz via Cin <cin at lists.cinelerra-gg.org>

> @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 cassette
> 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 today's
> 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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