interesting info, thanks! On Sunday, January 2, 2022, Andrea paz via Cin <cin@lists.cinelerra-gg.org> wrote:
> @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@lists.cinelerra-gg.org > https://lists.cinelerra-gg.org/mailman/listinfo/cin >
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