FFMPEG PNG to webm

Most the examples don't list basic file globing for input... so here it is:

$ ffmpeg -pattern_type glob -i '*.png' -c:v libvpx-vp9 -pix_fmt yuva420p output.webm

When new enough ffmpeg can do vp8 with transparency that is backwards compatible with decoders that DON'T support alpha channel:

$ ffmpeg -pattern_type glob -i '*.png' -c:v libvpx -pix_fmt yuva420p -metadata:s:v:0 alpha_mode="1" output.webm

Most examples show something like this:

$ ffmpeg -framerate 25 -f image2 -i frames/%03d.png -c:v libvpx -pix_fmt yuva420p output.webm

CH Pedal Information

I should have documented this (and other useful tools which I can't remember at this time) earlier:

/etc/udev/rules.d/99-CHProducts.rules:
KERNEL=="event*", ATTRS{idProduct}=="00f2", ATTRS{idVendor}=="068e", MODE="0666"
KERNEL=="event*", ATTRS{idProduct}=="00f3", ATTRS{idVendor}=="068e", MODE="0666"

There are some ways to scan input devices .. some "jstest" and another way -- can't remember because it would come in handy with previous post about NX6000D HID interface:

Ubuntu 18.04 app indicator issues?!

Not sure why, but there seems to be a lot of issues with gnome and app indicators (think system tray)..

So far this seems to work, but as it is a bit of voodoo, haven't tested it often.. (or at least some combination involving the following):

$ sudo apt purge gnome-shell-extension-appindicator indicator-common indicator-application

reboot / Alt-F2 'r'

gnome-tweaks -> extensions. make sure everything is disabled

reboot / Alt-F2 'r'

Ubuntu Software -> Add-Ons -> Shell Extensions -> Topicons plus (install)

reboot /Alt-F2 'r'

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