FFMPEG Cheatsheet

MP4 to Webm

ffmpeg -i video.mp4 -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis video.webm

MP4 to Webm

ffmpeg -i input.mp4 -c:v libtheora -q:v 7 -c:a libvorbis -q:a 4 output.ogv

MP4 to MP3

ffmpeg -i input.mp4 output.mp3

MKV to MP3

ffmpeg -i input.mkv -vn -c:a libmp3lame -y output.mp3

MOV to MP4 (Compressed)

ffmpeg -i my-video.mov -vcodec h264 -acodec mp2 my-video.mp4

Development With Har

Filter by response code:

#!/usr/bin/node
module.paths.push('/usr/lib/node_modules');
const fs = require('fs');
var data = {};
var params = process.argv[2];
function read(config={}){
  fs.readFile(params,'utf8',function(err,data){
    if(err) throw err;
    data = JSON.parse(data).log.entries;
    if(config.by.length>0){
      if(config.by[0]=='status'){
        data = data.filter(function(v){return v.response.status==config.by[1]}).map(function(v){return v.request.url});
      }
    };
    if(config.save){
      save()
    }else{
      console.log(data)
    }
  })
};
function save(){
  fs.writeFile(params.replace(/(\.har)$/,"-output$1"),JSON.stringify(data),function(err){if(err) throw err})
};
read({
  save:false,
  by:['status',404]
})

Regular Expression - Javascript

Separate string by character length

"This is String".replace(/(.{4})/,"$1\n")
Result:

This
 is 
Stri
ng