An attempt to take any size video file and reduce in size to 8MB or less by re-encoding, using ffmpeg

discord-video.sh

#!/bin/bash

# 64 000 000 bits / video length = target bitrate

#MAX_VIDEO_SIZE="60000000"
#MAX_VIDEO_SIZE="66108900"
MAX_VIDEO_SIZE="55000000"
#MAX_AUDIO_SIZE="4000000"
MAX_AUDIO_SIZE="1000000"

# Check argument

if [[ "$1" == "" ]]; then
        echo "Error: No video file selected"
        echo "Usage: $0 <video-file>"
        exit
fi

# Check if file is video, get duration if it is

DURATION=$(ffprobe -hide_banner "$1" -show_entries format=duration -v quiet -of csv="p=0")

if [[ "$DURATION" == "" ]]; then
        echo Error, ffprobe returned no duration. "$1" is possibly not a video file
        exit
fi

echo "$1 is a video file and is $DURATION seconds long"

# Calculate bitrate

#ADJUSTED_DURATION=$(printf "%.0f\n" "$DURATION")
#VIDEO_BITRATE=$(echo $((MAX_VIDEO_SIZE / ADJUSTED_DURATION*60/100)))
#AUDIO_BITRATE=$(echo $((MAX_AUDIO_SIZE / ADJUSTED_DURATION*75/100)))
ADJUSTED_DURATION=$(printf "%.0f00\n" "$DURATION")
VIDEO_BITRATE=$(echo $((MAX_VIDEO_SIZE / ADJUSTED_DURATION)))
VIDEO_BITRATE=$(echo $((VIDEO_BITRATE * 100)))
AUDIO_BITRATE=$(echo $((MAX_AUDIO_SIZE / ADJUSTED_DURATION)))
AUDIO_BITRATE=$(echo $((AUDIO_BITRATE * 100)))
echo "ADJUSTED_DURATION = $ADJUSTED_DURATION"
echo "VIDEO_BITRATE = $VIDEO_BITRATE"
echo "AUDIO_BITRATE = $AUDIO_BITRATE"

#ffmpeg -hide_banner -i "$1" -c:v libvpx-vp9 -b:v "$VIDEO_BITRATE" -vf scale=1280:720 -c:a libopus -b:a "$AUDIO_BITRATE" "$1-compressed.webm"

#ffmpeg -hide_banner -i "$1" -c:v libvpx-vp9 -b:v "$VIDEO_BITRATE" -c:a libopus -b:a "$AUDIO_BITRATE" "$1_8MB.webm"
ffmpeg -hide_banner -i "$1" -c:v libvpx-vp9 -b:v "$VIDEO_BITRATE" -c:a libopus -b:a "$AUDIO_BITRATE" "$1_8MB.mp4"