Get video resolution in nodejs

问题:

I have been trying to get an answer to this without really finding any. Excuse me if this sounds stupid or obvious.

I have a nodejs application and basically I would like to simply get the resolution of a video. Imagine I have film stored on disk and I would like to be able to know if it is in 720p or 1080p or anything else.

I understood that I might need to use ffmpeg to do so, but then I also understood that ffmpeg was mostly used to "record, convert and stream audio and video files". That does not mean retrieve video resolution.

Thank you for your help

Edit 1: The node.js app is a desktop app and needs to be portable to Linux, windows and OS X. If possible a portable answer would be more appreciated but of course any answer is welcome.

回答1:

To be honest I think the best method I found was to use fluent-ffmpeg with ffprobe as you are able to set the the path to the executable. The only problem is that ffmpeg has to be shipped with the app. So different executables have to be shipped, one for each distribution/os/derivation. If anyone has anything better I am open to answers.

Getting the width, height and aspect ratio using fluent-ffmpeg is done like so:

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

ffmpeg.setFfprobePath(pathToFfprobeExecutable);

ffmpeg.ffprobe(pathToYourVideo, function(err, metadata) {
    if (err) {
        console.error(err);
    } else {
        // metadata should contain 'width', 'height' and 'display_aspect_ratio'
        console.log(metadata);
    }
});

回答2:

One way to do this would be to to run another application as a child process, and get the resolution from std out. I'm not aware of any pure node.js solution for this.

See child_process.exec https://nodejs.org/api/child_process.html#child_process_child_process_exec_command_options_callback

and ffprobe How can I get the resolution (width and height) for a video file from a linux command line?

回答3:

I use node-ffprobe to accomplish this for images:

var probe = require('/usr/lib/node_modules/node-ffprobe');
probe(filePath, function (err, data) {
    //the 'data' variable contains the information about the media file
});