Piping to ffmpeg

[alexcroox]

I'm using https://github.com/fluent-ffmpeg/node-fluent-ffmpeg and I'd like to pipe the output from raspivid into ffmpeg.

I'm not sure how to go about this as ffmpeg requires an input.

camera.vid = raspivid({ width: 320, height: 240, "-fps": 18, "-b": 5000000, "-mm": "matrix", "-g": 100, "-t": 0 });

camera.stream = ffmpeg(camera.vid).inputOptions(["-y", "-f", "h264", "-video_size", "320x240", "-i", "-", "-c:v", "copy", "-map", "0:0", "-f", "flv", "-rtmp_buffer", "100", "-rtmp_live", "live", "rtmp://example.com/big/test"]));

[binocarlos]

What you have seems right having looked at the ffmpeg Readme. It talks about passing a Readable stream (which the camera.vid would be) and then chaining the inputOptions method.

What happens when you run the code above?

[alexcroox]

Sorry for the delay just got a rPi 2 so thought I'd get everything set up on there before continuing!

The error I get is

/home/pi/node_modules/fluent-ffmpeg/lib/options/custom.js:43
      throw new Error('No input specified');

So not sure I'm passing the input correctly, or it doesn't like camera.vid as an input.

[binocarlos]

Can you post the full stacktrace - I can't work out where line 43 of custom.js is being called from.

Thanks :)

[alexcroox]

Sure!

http://pastebin.com/XvUfUUMK

[binocarlos]

Hey - so what happens if you:

ffmpeg().addInput(camera.vidProc).inputOptions(...)

If this does not work - can you create a file from the camera (for example 'testfile.avi') and then try this:

ffmpeg().addInput('/tmp/testfile.avi').inputOptions(...)

This will test for sure if its an issue with a stream vs a static file.

[alexcroox]

I'm starting to wonder if there is a bigger problem with my setup at hand here

var fs = require('fs');

var file = fs.createWriteStream('/tmp/testfile.avi');
var video = raspivid();

video.pipe(file);

errors out

video.pipe(file);
      ^
TypeError: undefined is not a function
    at Object.<anonymous> (/home/pi/pi-node.js:32:7)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3

[binocarlos]

Hmmm odd - I would do 2 things:

a) run raspivid on your PI command line and check it is there b) use child_process.spawn directly - the core of this library is a tiny wrapper:

var fs = require('fs');
var child = require('child_process');

var video_process = child.spawn('raspivid', args, {
  stdio: ['ignore', 'pipe', process.stderr]
});

var file = fs.createWriteStream('/tmp/testfile.avi');

video_process.stdout.pipe(file);

Lets ignore this repo for a moment whilst trying to find what the problem is :-)

[binocarlos]

Regarding above args would be an array of command line arguments passed to raspivid

[alexcroox]

Yer raspivid is definitely OK as my current implementation works fine:

camera.process = child.spawn('./cam.sh', []);

cam.sh raspivid -n -mm matrix -w 320 -h 240 -fps 18 -g 100 -t 0 -b 5000000 -o - | ffmpeg -y -f h264 -i - -c:v copy -map 0:0 -f flv -rtmp_buffer 100 -rtmp_live live "rtmp://stream.sidg.tl/big/gun-turret"

This works absolutely fine. I'll try creating the test file as you mentioned

[binocarlos]

perhaps its to do with the stdio pipe arrangement - when you do the test file try doing with empty args like your example also...

[avrtau]

was this resolved?