Pipe output of ffmpeg using nodejs stdout
15,945
You have to pass pipe:1
to tell FFmpeg to write output to stdout. Here's an example taken from one of my projects:
var ffmpeg = spawn(argv.ffmpeg, [
'-i', argv.file,
'-f', 's16le', // PCM 16bits, little-endian
'-ar', '44100', // Sampling rate
'-ac', 2, // Stereo
'pipe:1' // Output on stdout
]);
https://github.com/lperrin/node_airtunes/blob/master/examples/play_ffmpeg.js
Author by
rughimire
Computer Engineer, Software Developer, .NET Developer, Android App Developer
Updated on August 21, 2022Comments
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rughimire over 1 year
I am not being able to pipe the output of the ffmpeg over a stdout.
Following are the block of code what I coded so far.
var http = require('http') , fs = require('fs') var child_process = require("child_process") http.createServer(function (req, res) { console.log("Request:", dump_req(req) , "\n") // path of the var path = 'test-mp4.mp4' //test-mp4-long.mp4 , stat = fs.statSync(path) , total = stat.size var range = req.headers.range , parts = range.replace(/bytes=/, "").split("-") , partialstart = parts[0] , partialend = parts[1] , start = parseInt(partialstart, 10) , end = partialend ? parseInt(partialend, 10) : total-1 , chunksize = (end-start)+1 console.log('RANGE: ' + start + ' - ' + end + ' = ' + chunksize + "\n") var ffmpeg = child_process.spawn("ffmpeg",[ "-i", path, // path "-b:v" , "64k", // bitrate to 64k "-bufsize", "64k", "-" // Output to STDOUT ]); //set header res.writeHead(206 , { 'Content-Range': 'bytes ' + start + '-' + end + '/' + total , 'Accept-Ranges': 'bytes', 'Content-Length': chunksize , 'Content-Type': 'video/mp4' }) stdout[ params[1] ] = ffmpeg.stdout // Pipe the video output to the client response ffmpeg.stdout.pipe(res); console.log("Response", dump_res(res), "\n") }).listen(1337)
When i replaced the ffmpeg stuffs from above code, all works fine. Following is the part of the code when i replace the ffmpeg stuffs.
var file = fs.createReadStream(path, {start: start, end: end})
And piping like:
file.pipe(res)
What wrong I am running?
Edit: The ffmpeg command works fine. I have tested this through the command line and generating proper output.
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rughimire about 10 yearsThanks a lot. it s now working in webm file format after adding 'pipe:1'. Did you have any idea to control the bandwidth like in youtube?
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Laurent Perrin about 10 yearsI used a circular buffer to control the bandwidth. You can see the code in my github repo.
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jpillora almost 9 yearsI get
Unable to find a suitable output format for 'pipe:1'
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ahmet alp balkan about 8 years@jpillora try adding something like
-f mp3
to force the output format -
Luke almost 3 yearsIt should be
-progress pipe:1
or you will get what @jpillora mentioned