mcopy/app/lib/ffprobe/index.js

144 lines
4.2 KiB
JavaScript

'use strict';
Object.defineProperty(exports, "__esModule", { value: true });
/** @module FFPROBE **/
const fs_extra_1 = require("fs-extra");
const path_1 = require("path");
const exec_1 = require("exec");
//const spawn = require('spawn');
//const exit = require('exit');
class FFPROBE {
constructor(sys) {
this.bin = sys.deps.ffprobe;
}
/**
* Parse the fps entry into a float representing the fps of a video
**/
parseFps(fpsStr) {
let fps = 30.0;
let parts;
if (fpsStr.indexOf('/') !== -1) {
parts = fpsStr.split('/');
fps = parseFloat(parts[0]) / parseFloat(parts[1]);
}
else {
fps = parseFloat(fpsStr);
}
return fps;
}
/**
* Get info on a video in json format. Use for filmout.
*
* @param {string} video Path to video
*
* @returns {object} Video info in an object
**/
async info(video) {
const cmd = `${this.bin} -v quiet -print_format json -show_format -show_streams "${video}"`;
let fileExists;
let raw;
let json;
let vid; //whether video has stream with video data
try {
fileExists = await fs_extra_1.exists(video);
}
catch (err) {
return exit(err, 5);
}
if (!fileExists) {
//return exit(`File ${video} does not exist`, 6);
console.error(new Error(`File ${video} does not exist`));
return false;
}
try {
console.log(cmd);
raw = await exec_1.exec(cmd);
}
catch (err) {
//return exit(err, 7);
console.error(err);
return false;
}
try {
json = JSON.parse(raw.stdout);
}
catch (err) {
return raw.stdout;
}
if (json.format && json.format.duration) {
json.seconds = parseFloat(json.format.duration);
}
if (json && json.streams) {
vid = json.streams.find((stream) => {
if (stream.width && stream.height)
return stream;
});
}
if (vid) {
json.width = vid.width;
json.height = vid.height;
json.fps = this.parseFps(vid.r_frame_rate);
}
return json;
}
/**
* Count the number of frames in the video using one of two methods.
* The first uses -select_streams and is very fast. The second uses
* -count_frames and is VERY slow.
*
* @param {string} video Path to video
*
* @returns {integer} Number of frames in video
**/
async frames(video) {
const ext = path_1.extname(video.toLowerCase());
let cmd = `${this.bin} -v error -select_streams v:0 -show_entries stream=nb_frames -of default=nokey=1:noprint_wrappers=1 "${video}"`;
let backup_cmd = `${this.bin} -v error -count_frames -select_streams v:0 -show_entries stream=nb_read_frames -of default=nokey=1:noprint_wrappers=1 "${video}"`;
let gif_cmd = `identify -format "%n\n" "${video}" | head -1`;
let fileExists;
let raw;
let frames;
try {
fileExists = await fs_extra_1.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_1.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) => {
return new FFPROBE(sys);
};
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