How “gradually” do the effects of control weather fade?

Control weather states that “When the spell ends, the weather gradually returns to normal” (PHB p288). While it gives a specific duration for each tier of effect, it leaves the return to normal up to interpretation. Does it change in a matter of minutes or hours, or could it be days or even weeks before the weather recovers from the change you’ve inflicted on it?

Does the “Fade Away” feature grant Greater Invisibility?

The new UA Ranger’s Fade Away feature states the following.

You can use a bonus action to magically become invisible, along with any equipment you are wearing or carrying, until the start of your next turn.

Does this feature effectively grant Greater Invisiblity until the Ranger’s next turn, in the sense that it is not interrupted by attacking?

This question is more of a sanity check, as, to me, this feature seems incredibly powerful. It would allow the Ranger to gain advantage on all of their attacks for an entire turn, while simultaneously imposing disadvantage on all attacks against them as well.

What is the cheapest way to damage myself and trigger the effects of the Fade Away feat?

For clarity, I mean cheap in the sense of the action economy. The ideal scenario would be to damage myself with a free object interaction or a small amount of movement.

Here is the relevant text of the Feat:

Immediately after you take damage, you can use a reaction to magically become invisible until the end of your next turn or until you attack, deal damage, or force someone to make a saving throw. Once you use this ability, you can’t do so again until you finish a short or long rest.

ffmpeg – Watermark every x second fade in/out and adjust for video resolution

I am using the current ffmpeg command to convert multiple videos and create a watermark that is a scrolling text that goes from right to left to right every 120 seconds of play time.

find /home/video/ -type f -execdir ffmpeg -i '{}' -filter:v "drawtext=fontfile=/root/FreeSans.ttf:text='QWERTY':fontcolor=white@1.0:fontsize=26:y=h-line_h-30:x=w/20*mod(t\,120),scale=854:480" -pix_fmt yuv420p -c:v libx264 -preset slow -b:v 1000k -minrate 500k -maxrate 2000k -bufsize 2000k -c:a aac -ar 44100 -b:a 128k -movflags +faststart '/home/video/new/{}.mp4' \; 

I would like to modify the watermark so it looks something like this

enter image description here

I would like the text shown above to fade in every 120 seconds and last for 15 seconds. Be bold format and the same colour (black).

“qwerty qwerty qwerty qwerty” new line
“qwerty qwerty qwerty qwerty”

Another issue I currently have with the current command I am using is with different video frames. For example if the video is only 800×600 the text will be very large. If the video is 1920×1080 the text will be extremely small. I would like the text size to be adjusted depending on the frame rate. It should look like above in terms of screen size.

On iPad or iPhone, how to progress PDF with “Fade” or “Appear” instead of slide-in from right?

The pages of my pdf presentation add incremental changes to the first page. The second page, for instance, consists of the diagram on the first page in addition to a few more lines. This way a complex figure can be introduced gradually.

But whether the PDF is viewed in iOS’ inbuilt files viewer, or other apps like Google Drive, Amazon Kindle, etc, the PDF always “slides in” each page, which defeats the effect I am after (a few changes just appear). Instead the audience is treated to a distracting effect.

Is there a way to disable the sliding and go back to replacing pages? Or any app that shows slides with just a simple “Appear” kind of effect? Welcome any pointers. Thanks!

MLT framework audio fade out because of shorter video

What I ask is automatically trimming the end of an audio file and fade out at the trimmed end.

There are short video clips which have a presentation style, like some maps and text instructions. These are typically produced from still images selected by my partner, and I get only an .mp4 file. As they have no audio, I wanted to automatically add some instrumental music as background, which is longer than almost all of the video clips. No graphics interface video editor is available anyway, only a Linux terminal.

The MLT framework seemed to be my way to go, but I am failing on trimming the music end and fade it out. One of my problems is that I cannot predict each video clip length.

One of my attempts included the sox.fade filter: melt music.mp3 -filter sox.fade:”h 5” -filter sox.fade:”h 0 00:45 5” -video-track V.mp4 out=1188 but it throws errors like “effect processing failed” with a horrible noise, or, using another command syntax, an error like “cannot fade out, audio length is neither known nor given”.

Another attempt for fade out tried to use two audio tracks, one of which is silence, and make a transition mix from music to silence. It only succeeded as fade in. melt V.mp4 in=0 out=1188 -attach-track volume:0 end=-70db in=1000 out=1188 -audio-track music.mp3 out=1188 -transition mix in=800 out=1188.

What could I do to find the correct way of trimming and fading out a longer audio track than the video, and how could I automate the process?