411 lines
12 KiB
PHP
411 lines
12 KiB
PHP
<?php
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function run( $prog, $params ) {
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$cmd = escapeshellcmd( $prog ) . " " . implode( ' ', array_map( 'escapeshellarg', $params ) );
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echo "\n$cmd\n\n";
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$output = [];
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$code = 0;
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if ( exec($cmd, $output, $code) === false ) {
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throw new Exception( 'failed to exec ffmpeg' );
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}
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if ( $code ) {
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throw new Exception( "ffmpeg returned coded $code" );
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}
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return $output;
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}
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function ffprobe( $file ) {
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$output = run( 'ffprobe', [ '-hide_banner', '-show_format', '-show_streams', '-print_format', 'json', '--', $file ] );
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$json = implode( "\n", $output );
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return json_decode( $json );
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}
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class Audio {
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public const FORMATS = [
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'aac' => [
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'container' => 'mp4',
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'options' => [
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'-acodec', 'aac',
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'-ar', 44100,
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'-ac', 2,
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'-b:a', '112k',
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],
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],
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'opus' => [
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'container' => 'mp4',
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'options' => [
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'-acodec', 'libopus',
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'-ar', 48000,
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'-ac', 2,
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'-b:a', '96k',
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],
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],
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'vorbis.webm' => [
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'container' => 'webm',
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'options' => [
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'-acodec', 'libvorbis',
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'-b:a', '112k',
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],
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],
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// with the added id3 timestamps this work great with iOS HLS
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// but mac safari doesn't seem happy with anything i do with them
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'mp3' => [
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'container' => 'mp3',
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'options' => [
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'-acodec', 'libmp3lame',
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'-ar', 44100,
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'-ac', 2,
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'-b:a', '128k',
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],
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],
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// works on iOS HLS but seems stuttery? i dunno why
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// mac safari doesn't seem to like it either
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'mp3.ts' => [
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'container' => 'ts',
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'options' => [
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'-acodec', 'libmp3lame',
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'-ar', 44100,
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'-ac', 2,
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'-b:a', '128k',
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],
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],
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// no dice on ios or macos safari
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'mp3.mp4' => [
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'container' => 'mp4',
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'options' => [
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'-acodec', 'libmp3lame',
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'-ar', 44100,
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'-ac', 2,
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'-b:a', '128k',
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],
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]
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];
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}
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class Video {
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// Normalize input frame rates to the next up of these.
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// Lets us ensure that keyframes are places where they belong.
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public const RATES = [
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15, 24, 25, 30, 48, 50, 60
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];
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public const FORMATS = [
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'mjpeg' => [
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// it doesn't seem to like this after all. worth trying!
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'container' => 'mov',
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'options' => [
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'common' => [
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'-vcodec', 'mjpeg',
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],
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'fallback' => [
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// no specific options :D
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],
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],
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'resolutions' => [
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'144p' => [
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'width' => 176,
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'height' => 144,
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'bitrate' => '1024k',
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]
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]
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],
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'vp9' => [
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'container' => 'mp4',
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'options' => [
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'common' => [
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'-vcodec', 'libvpx-vp9',
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'-row-mt', '1',
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'-tile-columns', '4',
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],
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'fast' => [
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'-quality', 'realtime',
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'-cpu-used', '5',
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],
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'pass1' => [
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'-quality', 'good',
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'-cpu-used', '2',
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'-pass', '1',
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],
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'pass2' => [
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'-quality', 'good',
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'-cpu-used', '1',
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'-pass', '2',
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]
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],
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'resolutions' => [
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'240p' => [
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'width' => 426,
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'height' => 240,
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'bitrate' => '150k',
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],
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'360p' => [
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'width' => 640,
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'height' => 360,
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'bitrate' => '250k',
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],
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'480p' => [
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'width' => 854,
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'height' => 480,
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'bitrate' => '750k',
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],
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'720p' => [
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'width' => 1280,
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'height' => 720,
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'bitrate' => '2500k',
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],
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'1080p' => [
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'width' => 1920,
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'height' => 1080,
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'bitrate' => '5000k',
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],
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'1440p' => [
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'width' => 2560,
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'height' => 1440,
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'bitrate' => '9000k',
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],
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'2160p' => [
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'width' => 3840,
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'height' => 2160,
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'bitrate' => '12500k',
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],
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],
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],
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];
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}
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class Fraction {
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public $numerator = 0;
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public $denominator = 0;
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public function __construct( $num, $denom ) {
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$this->numerator = $num;
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$this->denominator = $denom;
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}
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public function toFloat() {
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return $this->numerator / $this->denominator;
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}
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public function toString() {
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return "$this->numerator/$this->denominator";
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}
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public static function fromString( $frac ) {
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list ( $num, $denom ) = array_map( 'intval', explode( '/', $frac, 2 ) );
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return new Fraction( $num, $denom );
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}
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}
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class SourceFile {
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public $filename = '';
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public $duration = 0.0;
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public $video = false;
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public $width = 0;
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public $height = 0;
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public $fps = null;
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public $audio = false;
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public $sampleRate = 0;
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public $channels = 0;
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public function __construct( $filename ) {
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$this->filename = $filename;
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$data = ffprobe( $filename );
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$this->duration = $data->format->duration;
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foreach ( $data->streams as $stream ) {
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if ( $stream->codec_type == 'video' && !$this->video ) {
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$this->video = true;
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$this->width = $stream->width;
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$this->height = $stream->height;
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$this->fps = Fraction::fromString( $stream->r_frame_rate );
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}
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if ( $stream->codec_type === 'audio' && !$this->audio ) {
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$this->audio = true;
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$this->sampleRate = $stream->sample_rate;
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$this->channels = $stream->channels;
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}
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}
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}
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}
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class Transcoder {
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private $source = null;
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private $fps = 0;
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private $gop = 0;
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public const SEGMENT_DURATION = 10;
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public function __construct( SourceFile $source ) {
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$this->source = $source;
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// Normalize input fps to an even standard
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$infps = $this->source->fps->toFloat();
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$this->fps = Video::RATES[0];
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foreach ( Video::RATES as $rate ) {
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if ( $rate >= $infps ) {
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$this->fps = $rate;
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break;
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}
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}
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// Each self-contained group of pictures starts with a keyframe.
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$this->gop = $this->fps * self::SEGMENT_DURATION;
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}
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private function ffmpeg( $options, $outfile, $container ) {
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$playlist = "$outfile.m3u8";
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$init = "$outfile.init.$container";
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if ( $container == 'mp4' ) {
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// HLS muxer seems to give the right options for fMP4
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$segment = "$outfile.$container";
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$segmentOptions = [
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'-f', 'hls',
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'-hls_segment_type', 'fmp4',
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'-hls_flags', 'single_file',
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'-hls_time', '10',
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'-hls_playlist_type', 'vod',
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'-hls_fmp4_init_filename', $init,
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'-hls_segment_filename', $segment,
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'-y', $playlist,
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];
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} elseif ( $container == 'ts' ) {
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$segment = "$outfile.$container";
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$segmentOptions = [
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'-f', 'hls',
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'-hls_segment_type', 'mpegts',
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'-hls_flags', 'single_file',
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'-hls_time', '10',
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'-hls_playlist_type', 'vod',
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'-hls_segment_filename', $segment,
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'-y', $playlist,
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];
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} elseif ( $container == 'webm' ) {
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$segment = "$outfile.%04d.$container";
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$segmentOptions = [
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'-f', 'segment',
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'-segment_time', '10',
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'-segment_list', $playlist,
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'-y', $segment
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];
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} elseif ( $container == 'mov' ) {
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// For MJPEG, MP4 doesn't work in Apple HLS for some reason
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// but QuickTime is sortof ok for one segment?
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// Note segment won't make single fMP4-style files though.
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$segment = "$outfile.%04d.$container";
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$segmentOptions = [
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'-f', 'segment',
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//'-segment_format_options', 'movflags=frag_keyframe+empty_moov',
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//'-segment_format_options', 'movflags=+frag_keyframe+empty_moov+default_base_moof+faststart',
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'-segment_time', '10',
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'-segment_list', $playlist,
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'-y', $segment
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];
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} elseif ( $container == 'mp3' ) {
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// For MP3, segment it raw.
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// We'll need to postprocess to add an ID3 tag with timestamp
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// and to reassemble into a file with byte ranges.
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$segment = "$outfile.%04d.$container";
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$segmentOptions = [
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'-f', 'segment',
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'-segment_format_options', 'id3v2_version=0:write_xing=0:write_id3v1=0',
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'-segment_time', '10',
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'-segment_list', $playlist,
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'-y', $segment
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];
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} else {
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die( 'missing container in config' );
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}
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$ffmpegOptions = array_merge( [
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'-hide_banner',
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'-i', $this->source->filename,
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], $options, $segmentOptions);
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$output = run( 'ffmpeg', $ffmpegOptions );
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}
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public function video( $codec, $resolution, $mode ) {
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if ( !$this->source->video ) {
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throw new Error('no video');
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}
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$format = Video::FORMATS[$codec];
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$res = $format['resolutions'][$resolution];
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$options = array_merge(
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[
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'-pix_fmt', 'yuv420p',
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'-r', $this->fps,
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],
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$format['options']['common'],
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$format['options'][$mode],
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[
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'-vf', "scale=" . implode( ':', [ $res['width'], $res['height'] ] ),
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'-b:v', $res['bitrate'],
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'-g', $this->gop,
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'-keyint_min', $this->gop, // may not be generic enough
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'-an',
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]
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);
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$this->ffmpeg(
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$options,
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"{$this->source->filename}.{$resolution}.{$codec}.{$mode}",
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$format['container']
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);
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}
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public function audio( $codec ) {
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if ( !$this->source->audio ) {
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throw new Error('no audio');
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}
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$format = Audio::FORMATS[$codec];
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$options = array_merge(
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$format['options'],
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[
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'-vn',
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]
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);
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$this->ffmpeg(
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$options,
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"{$this->source->filename}.audio.{$codec}",
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$format['container']
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);
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}
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}
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$infiles = [
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'caminandes-llamigos.webm',
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];
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foreach ( $infiles as $filename ) {
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$source = new SourceFile( $filename );
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$codec = new Transcoder( $source );
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$codec->audio('aac');
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$codec->audio('opus');
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//$codec->audio('vorbis.webm');
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$codec->audio('mp3');
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$codec->audio('mp3.ts');
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$codec->audio('mp3.mp4');
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foreach ( Video::FORMATS['mjpeg']['resolutions'] as $res => $format ) {
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$codec->video('mjpeg', $res, 'fallback');
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}
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foreach ( Video::FORMATS['vp9']['resolutions'] as $res => $format ) {
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if ( $format['width'] <= $source->width && $format['height'] <= $source->height ) {
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$codec->video('vp9', $res, 'fast');
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}
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}
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foreach ( Video::FORMATS['vp9']['resolutions'] as $res => $format ) {
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if ( $format['width'] <= $source->width && $format['height'] <= $source->height ) {
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$codec->video('vp9', $res, 'pass1');
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$codec->video('vp9', $res, 'pass2');
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}
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}
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}
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