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
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; 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.
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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