Carol wrote: ↑
Wed Jun 03, 2020 4:26 pm
Question: How do you set things up to get the best contrast where you can see the line? We don't have any big blue walls around here.
I have bumped into this visibility issue with videos. Orange line in sunlight against trees works fine, but I can not always achieve that.
Here is an example: this is me playing around with switch cast trajectory (fwd cast height). In the original video, I tried to zoom in and move around the frame to see what is happening to the line. But I could not see much of what is going on.
So I started to explore what could be done to improve visibility. Now this is from the trenches of the good ole command-line interface
, sure y'all are using fancy sports video software on you iPads and whatnot. Anyway, I found a program called ffmpeg
that can do a lot
of different types of video and audio processing. The objective was to produce a video that highlights the interesting information. A bit like those fancy false color images
that are used for similar purposes.
Now ffmpeg has a million switches
, and at this point I only know a few, but some quick trials led to the command (ffplay is the version of ffmpeg that only shows the video but does not save it to a new file)
Code: Select all
ffplay switch.mp4 -vf amplify=factor=10,eq=saturation=3
Here two video filters are applied, the first one amplified temporal differences, and the second increases saturation. The end result is not pretty, but it shows what I wanted to see.
By playing around with the switches, you can emphasize the line more or less.