mcopy/src/ffprobe/index.ts

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'use strict';
/** @module FFPROBE **/
import { exists } from 'fs-extra';
import { extname } from 'path';
import { exec } from 'exec';
//const spawn = require('spawn');
//const exit = require('exit');
class FFPROBE {
private bin : string;
private log : any;
constructor (sys : any) {
this.bin = sys.deps.ffprobe;
}
/**
* Get info on a video in json format. Use for filmout.
*
* @param {string} video Path to video
*
* @returns {object} Video info in an object
**/
public async info (video : string) {
const cmd : string = `${this.bin} -v quiet -print_format json -show_format -show_streams "${video}"`
let fileExists : boolean;
let raw : any;
let json : any;
let vid : any; //whether video has stream with video data
try {
fileExists = await exists(video);
} catch (err) {
return exit(err, 5);
}
if (!fileExists) {
//return exit(`File ${video} does not exist`, 6);
console.error(new Error(`File ${video} does not exist`));
return false
}
try {
console.log(cmd);
raw = await exec(cmd);
} catch (err) {
//return exit(err, 7);
console.error(err);
return false
}
try {
json = JSON.parse(raw.stdout);
} catch (err) {
return raw.stdout;
}
if (json && json.streams) {
vid = json.streams.find((stream : any) => {
if (stream.width && stream.height) return stream;
});
}
if (vid) {
json.width = vid.width;
json.height = vid.height;
}
return json;
}
/**
* Count the number of frames in the video using one of two methods.
* The first uses -select_streams and is very fast. The second uses
* -count_frames and is VERY slow.
*
* @param {string} video Path to video
*
* @returns {integer} Number of frames in video
**/
public async frames (video : string) {
const ext : string = extname(video.toLowerCase());
let cmd : string = `ffprobe -v error -select_streams v:0 -show_entries stream=nb_frames -of default=nokey=1:noprint_wrappers=1 "${video}"`;
let backup_cmd : string = `ffprobe -v error -count_frames -select_streams v:0 -show_entries stream=nb_read_frames -of default=nokey=1:noprint_wrappers=1 "${video}"`;
let gif_cmd : string = `identify -format "%n\n" "${video}" | head -1`
let fileExists : boolean;
let raw : any;
let frames : number;
try {
fileExists = await exists(video);
} catch (err) {
//return exit(err, 5);
console.error(err);
return false
}
if (!fileExists) {
//return exit(`File ${video} does not exist`, 6);
console.error(new Error(`File ${video} does not exist`));
return false;
}
if (ext === '.mkv') {
cmd = backup_cmd;
} else if (ext === '.gif') {
cmd = gif_cmd;
}
try {
console.log(cmd);
raw = await exec(cmd);
} catch (err) {
console.error(err);
return false;
}
try {
frames = parseInt(raw.stdout);
} catch (err) {
return raw.stdout;
}
return frames;
}
}
/*
function map (obj : any) {
console.dir(obj);
}
*/
module.exports = (sys : any) => {
return new FFPROBE(sys);
}