Node-fluent-ffmpeg: logger defined but seeing no output

[binarykitchen]

I have new FfmpegCommand({logger: console.log}) here but am not seeing any output.

Any idea why?

[njoyard]

As stated in the documentation:

• logger: logger object with debug(), info(), warn() and error() methods (defaults to no logging)

console.log will not work there!

[binarykitchen]

That was just an example. I also tried with the bunyan and winston logger. Both have these methods but it still does not work.

[njoyard]

Fluent-ffmpeg does not log a lot of things, it mostly does when problems happen. What were you expecting to see ?

[binarykitchen]

Ah ... I expected the whole ffmpeg output.

There is a workaround for now:

command.on('end', function(err, stdout, stderr) {
    console.log(stdout);
}

but I wish the logger option would output these lines in real-time.

[njoyard]

That's not really an option, since ffmpeg rewrites its output multiple times during processing.

[njoyard]

If you need progress info though, you can use the 'progress' event !

[binarykitchen]

Ah, I think you should document that in the README.md - does the progress event come with stdout as a parameter?

[njoyard]

The progress event is documented in the README. But I guess you're right about the logger parameter not being well described. I may even remove it from the README as it is mainly useful to diagnose failures in the test suite.

[binarykitchen]

Yep it is documented but there is no stdout in the progress event.

Let's forget this. I'll stick to

command.on('end', function(err, stdout, stderr) {
    console.log(stdout);
}

but really, I wish there is an event to get the output in realtime. Similar like the message event in the avconv package at https://github.com/binarykitchen/avconv#how-to-watch-for-results-progress-meta-data-output-errors-exit-code

[odigity]

I just ran into the same issue. Logger was mentioned in the README, so I implemented it, then so no change. :)

Perhaps time to remove it from the README?

[kus]

I must admit, I just got caught up on the logger option as well and landed here because I was wondering why it wasn't working.

const log = (...args) => console.log(...args);
ffmpeg({source: filePath, logger: {debug: log, info: log, warn: log, error: log}})

I now use this which satisfies my requirements:

.on('progress', function(progress) {
    console.log('Processing: ' + progress.percent + '% done @ ' + progress.currentFps + ' fps');
})
.on('end', function(err, stdout, stderr) {
    console.log('Finished processing', err, stdout, stderr);
})

[paulo-digital]

Some thing here, the Log is poorly documented.