I might add one for scaling. I just don't use it as frequently as trying to meet a file size limit. The scaling is also much easier to remember
ffmpeg -i in.mp4 -vf "scale=600:-1" -an out.mp4
It does get complicated though, when scaling many videos and images, I've used something like the following in the past
find . -exec ffmpeg -i {} -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:-1:-1:color=black" {}.mp4 \;
Those were the only two that showed up when I typed history | grep scale.
after commenting, I also added a new video file resizer.
It works significantly better than the one I previously posted. It's also copied from stackoverflow.
bitrate="$(awk "BEGIN {print int($2 * 1024 * 1024 * 8 / $(ffprobe \
-v error \
-show_entries format=duration \
-of default=noprint_wrappers=1:nokey=1 \
"$1" \
) / 1000)}")k"
ffmpeg \
-y \
-i "$1" \
-c:v libx264 \
-preset medium \
-b:v $bitrate \
-pass 1 \
-an \
-f mp4 \
/dev/null \
&& \
ffmpeg \
-i "$1" \
-c:v libx264 \
-preset medium \
-b:v $bitrate \
-pass 2 \
-an \
"${1%.*}-$2mB.mp4"