various useful stuff for FPV

DVR video Upscaling (dvrupscaler)

I've build up this ffmpeg one-liner and script to achieve the following things :

• provide a DVR video file and optionally an MP3 soundtrack
• get an upscaled and optimised file for posting on youtube or other social medias (1920x1080 format, h264 mp4 file)
• note that the video & audio formats are not restricted, you should be able to use whatever you want.

ffmpeg -f lavfi -i anullsrc -i DVR_VIDEO _FILE.mov \
	-pix_fmt yuv420p -shortest -c:v libx264 -b:v 8M \
	-vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1" \
	-c:a aac -map 0:a -map 1:v \
	VIDEO_FILE_upscaled.mp4

the output will be an h264 encoded mp4 and your original 640x480 video will be upscaled to 1920x1080 while respecting the proportions.

dvrupscaler shell script

you can turn this into a simple bash script that takes a video file as input or use the provided dvrupscaler script :

usage : dvrupscaler 
	-f dvr_video.mov : specifiy the path to the video file to upscale
	
	[-a /path/to/audio/file.mp3] : optional path to an audio file to add to the video (by default the script will output an upscaled video with no sound) 
	
	[-v:verbose] : makes ffmpeg verbose
	
	[-s:shortest] : use this parameter if the audio file provided is longer than the video file. This will trim the upscaled video to the shortest input file.

#!/bin/bash

################################################################################
# dvrupscaler - a DVR file upscaling script for social media video adaptation
# -> scales video to 1920x1080, converts to h264, nulls the audio track or uses 
# an mp3 audio file specified with the -a(udio) option. Should use the 
# -s(hortest) parameter # if your audio file is longer than the video.
# 
# Author : A.Arvinte (ledrone.club) - Aug 2019
# https://github.com/ledroneclub/tools
################################################################################

# Reset in case getopts has been used previously in the shell.
OPTIND=1 
# Initialize our variables
vfile=""
afile=""
verbose=0
shortest=0

logparams="-loglevel quiet -stats"
shortparams=""
audiosource="-f lavfi -i anullsrc"

while getopts "h?vf:a:s" opt; do
    case "$opt" in
    h|\?)
        echo "dvrupscaler -f video_file [–a audio_file] [-v:verbose] [-s:shorten to shortest input file]"
        exit 0
        ;;
    v)  verbose=1
        ;;
    a)  afile=$OPTARG
        audiosource="-i $afile"
        ;;
    f)  vfile=$OPTARG
        ;;
    s)  shortest=1
        ;;    
    esac
done

if [ $verbose -eq 1 ]; then
    logparams=""
fi

if [ $shortest -eq 1 ] || [ -z $afile ]; then
    shortparams="-shortest"
fi

shift $((OPTIND-1))
[ "${1:-}" = "--" ] && shift

file_pwd=$(dirname "${vfile}")
file_name_full=$(basename -- "$vfile")
file_ext="${file_name_full##*.}"
file_name="${file_name_full%.*}"
file_out=$file_pwd/${file_name}_upscaled.mp4

echo "Will encode $vfile to $file_out"


ffmpeg $logparams $audiosource -i $vfile \
    -pix_fmt yuv420p -c:v libx264 -b:v 8M \
    -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,setsar=1" \
    -c:a aac -map 0:a -map 1:v $shortparams $file_out