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/**
* High-Level API Example: DASH Streaming
*
* Shows how to create MPEG-DASH streams from RTSP/file sources.
* Demonstrates fragmented MP4 output with configurable segment duration.
*
* Usage: tsx examples/api-dash.ts <input> <output-dir> [options]
*
* Options:
* --duration <n> Recording duration in seconds (default: 10)
* --segment <n> DASH segment duration in seconds (default: 2)
* --window-size <n> DASH window size (default: 10)
* --bitrate <rate> Video bitrate (default: 5M)
* --preset <preset> Encoder preset (default: ultrafast)
*
* Examples:
* tsx examples/api-dash.ts testdata/video.mp4 examples/.tmp/dash --bitrate 2M --segment 4
* tsx examples/api-dash.ts rtsp://camera.local/stream examples/.tmp/dash
* tsx examples/api-dash.ts rtsp://admin:pass@192.168.1.100/ch1 examples/.tmp/dash --duration 30
* tsx examples/api-dash.ts rtsp://server/live examples/.tmp/dash --preset medium --window-size 20
*/
import fs from 'fs/promises';
import { AV_PIX_FMT_YUV420P, Decoder, Demuxer, Encoder, FF_ENCODER_LIBX264, FilterAPI, FilterPreset, Muxer } from '../src/index.js';
import { prepareTestEnvironment } from './index.js';
// Parse command line arguments
const args = process.argv.slice(2);
const inputUrl = args[0];
const outputDir = args[1];
if (!inputUrl || !outputDir || inputUrl.startsWith('--') || outputDir.startsWith('--')) {
console.error('Usage: tsx examples/api-dash.ts <input> <output-dir> [options]');
console.error('Options:');
console.error(' --duration <n> Recording duration in seconds (default: 10)');
console.error(' --segment <n> DASH segment duration in seconds (default: 2)');
console.error(' --window-size <n> DASH window size (default: 10)');
console.error(' --bitrate <rate> Video bitrate (default: 5M)');
console.error(' --preset <preset> Encoder preset (default: ultrafast)');
process.exit(1);
}
// Parse options
const durationIndex = args.indexOf('--duration');
const duration = durationIndex !== -1 ? parseInt(args[durationIndex + 1]) : 10;
const segmentIndex = args.indexOf('--segment');
const segmentDuration = segmentIndex !== -1 ? parseInt(args[segmentIndex + 1]) : 2;
const windowSizeIndex = args.indexOf('--window-size');
const windowSize = windowSizeIndex !== -1 ? parseInt(args[windowSizeIndex + 1]) : 10;
const bitrateIndex = args.indexOf('--bitrate');
const bitrate = bitrateIndex !== -1 ? args[bitrateIndex + 1] : '5M';
const presetIndex = args.indexOf('--preset');
const preset = presetIndex !== -1 ? args[presetIndex + 1] : 'ultrafast';
let stop = false;
prepareTestEnvironment();
console.log(`Input: ${inputUrl}`);
console.log(`Output Directory: ${outputDir}`);
console.log(`Duration: ${duration} seconds`);
console.log(`Segment Duration: ${segmentDuration} seconds`);
console.log(`Window Size: ${windowSize}`);
console.log(`Bitrate: ${bitrate}`);
console.log(`Encoder Preset: ${preset}`);
// Prepare output directory
const dashManifestPath = `${outputDir}/manifest.mpd`;
console.log('Preparing output directory...');
await fs.rm(outputDir, { recursive: true, force: true });
await fs.mkdir(outputDir, { recursive: true });
// Detect if input is RTSP
const isRtsp = inputUrl.toLowerCase().startsWith('rtsp://');
// Open input
console.log(isRtsp ? 'Connecting to RTSP stream...' : 'Opening input file...');
await using input = await Demuxer.open(inputUrl, {
options: isRtsp ? { rtsp_transport: 'tcp' } : undefined,
});
// Get video stream
const videoStream = input.video();
if (!videoStream) {
throw new Error('No video stream found in input');
}
// Display input information
console.log('\nInput Information:');
console.log(`Video: ${videoStream.codecpar.width}x${videoStream.codecpar.height}`);
console.log(`Codec: ${videoStream.codecpar.codecId}`);
console.log(`Format: ${videoStream.codecpar.format}`);
console.log(`Time base: ${videoStream.timeBase.num}/${videoStream.timeBase.den}`);
console.log(`Frame rate: ${videoStream.avgFrameRate.num}/${videoStream.avgFrameRate.den}`);
// Create decoder
console.log('\nCreating video decoder...');
using decoder = await Decoder.create(videoStream);
// Create filter (ensure YUV420P for DASH compatibility)
const filterChain = FilterPreset.chain().format(AV_PIX_FMT_YUV420P).build();
console.log(`\nCreating filter: ${filterChain}`);
using filter = FilterAPI.create(filterChain, {
framerate: videoStream.avgFrameRate,
});
// Create encoder
console.log('\nCreating H.265 encoder...');
using encoder = await Encoder.create(FF_ENCODER_LIBX264, {
decoder,
filter,
bitrate,
options: {
preset,
tune: isRtsp ? 'zerolatency' : undefined,
},
});
// Create DASH output
console.log('\nCreating DASH output...');
await using dashOutput = await Muxer.open(dashManifestPath, {
input, // Pass input for automatic metadata copying (Title, etc.)
options: {
movflags: 'frag_keyframe+empty_moov+default_base_moof',
seg_duration: segmentDuration,
window_size: windowSize,
extra_window_size: Math.floor(windowSize / 2),
},
});
// Add video stream
const dashVideoStreamIndex = dashOutput.addStream(videoStream, { encoder });
console.log('\nDASH Configuration:');
console.log(`Segment Duration: ${segmentDuration}s`);
console.log(`Window Size: ${windowSize} segments`);
console.log(`Manifest: ${dashManifestPath}`);
// Set up timeout for recording duration
const timeout = setTimeout(() => {
console.log(`\nRecording duration reached (${duration}s), stopping...`);
stop = true;
}, duration * 1000);
// Process streams
console.log('\nStreaming started...');
const startTime = Date.now();
let packetsWritten = 0;
let framesProcessed = 0;
try {
// Create processing pipeline
const videoInputGenerator = input.packets(videoStream.index);
const videoDecoderGenerator = decoder.frames(videoInputGenerator);
const videoFilterGenerator = filter.frames(videoDecoderGenerator);
const videoEncoderGenerator = encoder.packets(videoFilterGenerator);
// Process video
for await (const packet of videoEncoderGenerator) {
if (stop) {
break;
}
await dashOutput.writePacket(packet, dashVideoStreamIndex);
packetsWritten++;
framesProcessed++;
// Progress indicator
if (packetsWritten % 30 === 0) {
const elapsed = (Date.now() - startTime) / 1000;
const fps = framesProcessed / elapsed;
console.log(`Streaming: ${elapsed.toFixed(1)}s - Frames: ${framesProcessed} (${fps.toFixed(1)} fps)`);
}
}
} finally {
clearTimeout(timeout);
}
const elapsed = (Date.now() - startTime) / 1000;
console.log('\nStreaming complete!');
console.log(`Duration: ${elapsed.toFixed(2)} seconds`);
console.log(`Frames processed: ${framesProcessed}`);
console.log(`Average FPS: ${(framesProcessed / elapsed).toFixed(2)}`);
console.log(`Packets written: ${packetsWritten}`);
console.log(`DASH manifest: ${dashManifestPath}`);
console.log(`\nTo play: ffplay ${dashManifestPath}`);