@eleven-am/transcoder
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High-performance HLS transcoding library with hardware acceleration, intelligent client management, and distributed processing support for Node.js
227 lines • 7.2 kB
JavaScript
"use strict";
/*
* @eleven-am/transcoder
* Copyright (C) 2025 Roy OSSAI
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.FfmpegCommand = void 0;
exports.default = ffmpeg;
const child_process_1 = require("child_process");
const utils_1 = require("./utils");
class FfmpegCommand extends utils_1.ExtendedEventEmitter {
constructor(inputPath) {
super();
this.inputOpts = [];
this.outputOpts = [];
this.outputPath = '';
this.process = null;
this.isRunning = false;
this.processTimeout = null;
this.processTimeoutMs = 300000; // 5 minutes
this.inputPath = inputPath;
}
/**
* Add input options to the command
* @param options Array of input options
*/
inputOptions(options) {
this.inputOpts.push(...options);
return this;
}
/**
* Add output options to the command
* @param options Array of output options
*/
outputOptions(options) {
this.outputOpts.push(...options);
return this;
}
/**
* Add video filters to the command
* @param filters Video filter string
*/
videoFilters(filters) {
this.videoFilterOpts = filters;
return this;
}
/**
* Set the output path
* @param outputPath Path for the output file
*/
output(outputPath) {
this.outputPath = outputPath;
return this;
}
/**
* Execute the FFmpeg command
*/
run() {
if (this.isRunning) {
return;
}
this.isRunning = true;
const args = this.buildArgs();
this.process = (0, child_process_1.spawn)('ffmpeg', args);
let stderrBuffer = '';
// Set up timeout
this.processTimeout = setTimeout(() => {
if (this.isRunning) {
this.kill('SIGTERM');
this.emit('error', new Error('FFmpeg process timed out'));
}
}, this.processTimeoutMs);
this.emit('start', {
command: `ffmpeg ${args.join(' ')}`,
});
this.process.stderr.on('data', (data) => {
const output = data.toString();
stderrBuffer += output;
});
this.process.stdout.on('data', (data) => {
const output = data.toString();
const regex = /segment-(?<segment>\d+)\.ts/;
const match = output.match(regex);
if (match && match.groups) {
const segment = parseInt(match.groups.segment, 10);
this.emit('progress', { segment });
}
});
this.process.on('close', (code) => {
this.cleanup();
if (code === 0 || code === null) {
this.emit('end', undefined);
}
else {
const error = new Error(`FFmpeg process exited with code ${code} and output: ${stderrBuffer}`);
this.emit('error', error);
}
});
this.process.on('error', (err) => {
this.cleanup();
this.emit('error', err);
});
// Clean up on process exit
this.process.on('exit', () => {
this.cleanup();
});
}
/**
* Kill the FFmpeg process
* @param signal Signal to send to the process
*/
kill(signal = 'SIGKILL') {
if (this.process && this.isRunning) {
this.process.kill(signal);
this.cleanup();
}
}
/**
* Cleanup resources
*/
cleanup() {
this.isRunning = false;
if (this.processTimeout) {
clearTimeout(this.processTimeout);
this.processTimeout = null;
}
// Remove all listeners to prevent memory leaks
if (this.process) {
this.process.removeAllListeners();
this.process.stderr.removeAllListeners();
this.process.stdout.removeAllListeners();
this.process = null;
}
}
/**
* Pipe the FFmpeg output to a stream rather than a file
* @returns The stdout stream from the FFmpeg process
*/
pipe() {
if (this.isRunning) {
throw new Error('FFmpeg process is already running');
}
this.outputPath = '-';
const args = this.buildArgs();
this.process = (0, child_process_1.spawn)('ffmpeg', args);
this.isRunning = true;
let stderrBuffer = '';
this.emit('start', {
command: `ffmpeg ${args.join(' ')}`,
});
// Set up timeout for pipe mode
this.processTimeout = setTimeout(() => {
if (this.isRunning) {
this.kill('SIGTERM');
this.emit('error', new Error('FFmpeg process timed out'));
}
}, this.processTimeoutMs);
this.process.stderr.on('data', (data) => {
const output = data.toString();
stderrBuffer += output;
const progressRegex = /time=(\d+:\d+:\d+.\d+)/;
const match = output.match(progressRegex);
if (match) {
this.emit('progress', { segment: 0 });
}
});
this.process.on('error', (err) => {
this.cleanup();
this.emit('error', err);
});
this.process.on('close', (code) => {
this.cleanup();
if (code === 0 || code === null) {
this.emit('end', undefined);
}
else {
const error = new Error(`FFmpeg process exited with code ${code} and output: ${stderrBuffer}`);
this.emit('error', error);
}
});
// Clean up on process exit
this.process.on('exit', () => {
this.cleanup();
});
return this.process.stdout;
}
/**
* Build the complete FFmpeg command arguments
*/
buildArgs() {
const args = [
...this.inputOpts,
'-i',
this.inputPath,
];
if (this.videoFilterOpts) {
args.push('-vf', this.videoFilterOpts);
}
args.push(...this.outputOpts);
if (this.outputPath) {
args.push(this.outputPath);
}
return args;
}
}
exports.FfmpegCommand = FfmpegCommand;
/**
* Factory function that mimics the fluent-ffmpeg module's interface
* @param inputPath Input file path
*/
function ffmpeg(inputPath) {
return new FfmpegCommand(inputPath);
}
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