> "For video tapes, we always recommend capturing lossless, 10-bit, 4:2:2 or > better" > https://www.archivalworks.com/blog/best-practices-for-digiti > zing-and-preserving-analog-media > > If you're trying make high-quality copies of analogue video, you really >> need to treat the analogue signal before digitizing it - at a minimum there >> ought to be a time-base correcter (TBC) in there; >> > > Thanks for your feedback. > And yes, I agree. I didn't tell that I actually have a legacy pretty good > TBC (built in a Videonics MX-1 videomixer) which I also used before A/D > converting and capturing DV25 on a Datavideo DN-300 DV & HDV HDD recorder. > The MX-1 PAL version, which also had a usable noise filters, was specified > as "broadcast quality" with 17,72 MHz sampling, 8-bit 4:2:2 (not 10-bit as > its successor MXPro). > > So, I plan to apply the MX-1/TBC between the S-video player and the A/D > converter the HDMI based chain above. > > My suspection is that the visual lesser color and brightness from DV25 > playback, mainly is due to the format's limited 8-bit 4:2:0 sampling. > > > better would be a waveform monitor and proc amp* so you can adjust things. >> >> *for instance, if the white digitizes to 180 instead of 235 (or 254/5), >> stretching that in ffmpeg loses intensity resolution as it has to >> interpolate values. >> > > This is beyond my knowledge. > What I also had available, but possibly is non-working now, is a legacy > video-color corrector (Video Tech Designs VCC 3010). > > (And not to mention, I also have a legacy Blackmagic A/D-SDI converter + > Hyperdeck Shuttle2 SSD recorder, which managed 10-bit ProRes HQ 422 for > both S-video and HDV. > But last time I tried, these devices were unhappily non-usable due to EOS > BM firmware) > > > So therefore I am still curious in suggestions regarding the requested > "10-bit Chroma upsampling" using ffmpeg and possible color noise filters(?) > to benefit Analog (and also HDV) backup via HDMI? > > +1 for Carl's comments. Your results largely depend on how well you can 'massage' the signal in the analogue domain, and then on the capabilities of your A/D converter, especially its quantizer. If you can only capture at 8bpc, there is no point in re-sampling the original capture file to 10bit, you're not storing better information. If your capturing device gives you a 8bpc 4:2:2 output, that's what I think you store store as your uncompressed/lossless master file to work from later. Everything done afterwards ... well, YMMV. You can still re-sample from 8bpc to 10bpc and have no visible or measurable difference compared to a 10bpc capture from an 8bpc converter. In some cases (even segments from the same tape source) you may achieve satisfactory results with one setting/combination, others may require a ton of adjustments and still look unsatisfactory. I guess this is not the answer you would have loved to hear... but (professional) archival and restoration is rarely a set-and-forget effort. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user
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