[FFmpeg-user] Benefits from Chroma Upsampling v4l2 8bit 422 to 10bit 422 FFV1 backup?

[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

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