FFmpeg with node.js.轉碼文件爲另一種格式

Question

有一點這個問題，我有，我想使用的FFmpeg轉碼成。FLV文件.avi文件，這裏是我到目前爲止有：

var ffmpeg = require('fluent-ffmpeg'); 

//make sure you set the correct path to your video file 
var proc = new ffmpeg({ source: 'C:/Users/Jay/Documents/movie/drop.avi', nolog: true }) 

//Set the path to where FFmpeg is installed 
.setFfmpegPath("C:\Users\Jay\Documents\FFMPEG") 

//set the size 
.withSize('50%') 

// set fps 
.withFps(24) 

// set output format to force 
.toFormat('flv') 

// setup event handlers 
.on('end', function() { 
    console.log('file has been converted successfully'); 
}) 
.on('error', function(err) { 
    console.log('an error happened: ' + err.message); 
}) 
// save to file <-- the new file I want --> 
.saveToFile('C:/Users/Jay/Documents/movie/drop.flv'); 

這似乎很簡單，我可以通過FFmpeg的命令行做到這一點，但我想獲得它的Node.js應用程序內的工作，這裏是它返回的錯誤：

C:\Users\Jay\workspace\FFMPEGtest\test.js:17 
.withSize('50%') 
^ 
TypeError: Cannot call method 'withSize' of undefined 
    at Object.<anonymous> (C:\Users\Jay\workspace\FFMPEGtest\test.js:17:2) 
    at Module._compile (module.js:456:26) 
    at Object.Module._extensions..js (module.js:474:10) 
    at Module.load (module.js:356:32) 
    at Function.Module._load (module.js:312:12) 
    at Function.Module.runMain (module.js:497:10) 
    at startup (node.js:119:16) 
    at node.js:906:3 

它拋出對於每個內置的FFmpeg函數（.toFormat，.withFPS等）都有同樣的錯誤

如果任何人有一個解決的辦法，我會非常感激

Answer 1

setFfmpegPath()不返回this的實例，如在源here. 看到這意味着你不能鏈的方法。

將其更改爲

var ffmpeg = require('fluent-ffmpeg'); 

//make sure you set the correct path to your video file 
var proc = new ffmpeg({ source: 'C:/Users/Jay/Documents/movie/drop.avi', nolog: true }) 

//Set the path to where FFmpeg is installed 
proc.setFfmpegPath("C:\\Users\\Jay\\Documents\\FFMPEG") 

proc 
//set the size 
.withSize('50%') 

// set fps 
.withFps(24) 

// set output format to force 
.toFormat('flv') 

// setup event handlers 
.on('end', function() { 
    console.log('file has been converted successfully'); 
}) 
.on('error', function(err) { 
    console.log('an error happened: ' + err.message); 
}) 
// save to file <-- the new file I want --> 
.saveToFile('C:/Users/Jay/Documents/movie/drop.flv');