Den 20.05.2025 18:27, skrev Carl Zwanzig:
On 5/19/2025 5:45 AM, Terje J. Hanssen wrote:
Now I am testing another backup method with purpose of best practical
video quality using ffmpeg to encode lossless compressed FFV1.mkv files:
Analog video camera/player --> S-video/HDMI converter -->
HDMI/USB3 capture card --> v4l2 --> ffmpeg/ FFV1.mkv
First, a minor correction to the reference in my first post is:
"For video tapes, we always recommend capturing lossless, 10-bit, 4:2:2
or better"
https://www.archivalworks.com/blog/best-practices-for-digitizing-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?
Terje J. H
OTOH, if you're only after "it looks pretty good", then disregard the
above :D.
Later,
z!
who still remembers some of The Old Ways :D
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