313 lines
8.5 KiB
PHP
313 lines
8.5 KiB
PHP
|
<?php
|
||
|
|
||
|
function run( $prog, $params ) {
|
||
|
$cmd = escapeshellcmd( $prog ) . " " . implode( ' ', array_map( 'escapeshellarg', $params ) );
|
||
|
echo "\n$cmd\n\n";
|
||
|
$output = [];
|
||
|
$code = 0;
|
||
|
if ( exec($cmd, $output, $code) === false ) {
|
||
|
throw new Exception( 'failed to exec ffmpeg' );
|
||
|
}
|
||
|
if ( $code ) {
|
||
|
throw new Exception( "ffmpeg returned coded $code" );
|
||
|
}
|
||
|
return $output;
|
||
|
}
|
||
|
|
||
|
function ffprobe( $file ) {
|
||
|
$output = run( 'ffprobe', [ '-hide_banner', '-show_format', '-show_streams', '-print_format', 'json', '--', $file ] );
|
||
|
$json = implode( "\n", $output );
|
||
|
return json_decode( $json );
|
||
|
}
|
||
|
|
||
|
class Audio {
|
||
|
public const FORMATS = [
|
||
|
'aac' => [
|
||
|
'options' => [
|
||
|
'-acodec', 'aac',
|
||
|
'-ar', 44100,
|
||
|
'-ac', 2,
|
||
|
'-b:a', '112k',
|
||
|
],
|
||
|
],
|
||
|
'opus' => [
|
||
|
'options' => [
|
||
|
'-acodec', 'libopus',
|
||
|
'-ar', 48000,
|
||
|
'-ac', 2,
|
||
|
'-b:a', '96k',
|
||
|
],
|
||
|
],
|
||
|
'mp3' => [
|
||
|
'options' => [
|
||
|
'-acodec', 'libmp3lame',
|
||
|
'-ar', 44100,
|
||
|
'-ac', 2,
|
||
|
'-b:a', '128k',
|
||
|
],
|
||
|
],
|
||
|
'alac' => [
|
||
|
'options' => [
|
||
|
'-acodec', 'alac',
|
||
|
'-ar', 11025,
|
||
|
'-ac', 2,
|
||
|
],
|
||
|
],
|
||
|
'vorbis' => [
|
||
|
'options' => [
|
||
|
'-acodec', 'libvorbis',
|
||
|
'-ar', 44100,
|
||
|
'-ac', 2,
|
||
|
'-b:a', '112k',
|
||
|
],
|
||
|
],
|
||
|
];
|
||
|
}
|
||
|
|
||
|
class Video {
|
||
|
// Normalize input frame rates to the next up of these.
|
||
|
// Lets us ensure that keyframes are places where they belong.
|
||
|
public const RATES = [
|
||
|
15, 24, 25, 30, 48, 50, 60
|
||
|
];
|
||
|
|
||
|
public const FORMATS = [
|
||
|
'vp9' => [
|
||
|
'options' => [
|
||
|
'common' => [
|
||
|
'-vcodec', 'libvpx-vp9',
|
||
|
'-row-mt', '1',
|
||
|
],
|
||
|
'fast' => [
|
||
|
'-quality', 'realtime',
|
||
|
'-cpu-used', '5',
|
||
|
],
|
||
|
'pass1' => [
|
||
|
'-quality', 'good',
|
||
|
'-cpu-used', '2',
|
||
|
'-pass', '1',
|
||
|
],
|
||
|
'pass2' => [
|
||
|
'-quality', 'good',
|
||
|
'-cpu-used', '1',
|
||
|
'-pass', '2',
|
||
|
]
|
||
|
],
|
||
|
'resolutions' => [
|
||
|
'240p' => [
|
||
|
'width' => 426,
|
||
|
'height' => 240,
|
||
|
'bitrate' => '150k',
|
||
|
],
|
||
|
'360p' => [
|
||
|
'width' => 640,
|
||
|
'height' => 360,
|
||
|
'bitrate' => '250k',
|
||
|
],
|
||
|
'480p' => [
|
||
|
'width' => 854,
|
||
|
'height' => 480,
|
||
|
'bitrate' => '750k',
|
||
|
],
|
||
|
'720p' => [
|
||
|
'width' => 1280,
|
||
|
'height' => 720,
|
||
|
'bitrate' => '2500k',
|
||
|
],
|
||
|
'1080p' => [
|
||
|
'width' => 1920,
|
||
|
'height' => 1080,
|
||
|
'bitrate' => '5000k',
|
||
|
],
|
||
|
'1440p' => [
|
||
|
'width' => 2560,
|
||
|
'height' => 1440,
|
||
|
'bitrate' => '9000k',
|
||
|
],
|
||
|
'2160p' => [
|
||
|
'width' => 3840,
|
||
|
'height' => 2160,
|
||
|
'bitrate' => '12500k',
|
||
|
],
|
||
|
],
|
||
|
],
|
||
|
];
|
||
|
}
|
||
|
|
||
|
class Fraction {
|
||
|
public $numerator = 0;
|
||
|
public $denominator = 0;
|
||
|
|
||
|
public function __construct( $num, $denom ) {
|
||
|
$this->numerator = $num;
|
||
|
$this->denominator = $denom;
|
||
|
}
|
||
|
|
||
|
public function toFloat() {
|
||
|
return $this->numerator / $this->denominator;
|
||
|
}
|
||
|
|
||
|
public function toString() {
|
||
|
return "$this->numerator/$this->denominator";
|
||
|
}
|
||
|
|
||
|
public static function fromString( $frac ) {
|
||
|
list ( $num, $denom ) = array_map( 'intval', explode( '/', $frac, 2 ) );
|
||
|
return new Fraction( $num, $denom );
|
||
|
}
|
||
|
}
|
||
|
|
||
|
class SourceFile {
|
||
|
public $filename = '';
|
||
|
public $duration = 0.0;
|
||
|
|
||
|
public $video = false;
|
||
|
public $width = 0;
|
||
|
public $height = 0;
|
||
|
public $fps = null;
|
||
|
|
||
|
public $audio = false;
|
||
|
public $sampleRate = 0;
|
||
|
public $channels = 0;
|
||
|
|
||
|
public function __construct( $filename ) {
|
||
|
$this->filename = $filename;
|
||
|
|
||
|
$data = ffprobe( $filename );
|
||
|
|
||
|
$this->duration = $data->format->duration;
|
||
|
foreach ( $data->streams as $stream ) {
|
||
|
if ( $stream->codec_type == 'video' && !$this->video ) {
|
||
|
$this->video = true;
|
||
|
$this->width = $stream->width;
|
||
|
$this->height = $stream->height;
|
||
|
$this->fps = Fraction::fromString( $stream->r_frame_rate );
|
||
|
}
|
||
|
if ( $stream->codec_type === 'audio' && !$this->audio ) {
|
||
|
$this->audio = true;
|
||
|
$this->sampleRate = $stream->sample_rate;
|
||
|
$this->channels = $stream->channels;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
class Transcoder {
|
||
|
private $source = null;
|
||
|
private $fps = 0;
|
||
|
private $gop = 0;
|
||
|
|
||
|
public const SEGMENT_DURATION = 10;
|
||
|
|
||
|
public function __construct( SourceFile $source ) {
|
||
|
$this->source = $source;
|
||
|
|
||
|
// Normalize input fps to an even standard
|
||
|
$infps = $this->source->fps->toFloat();
|
||
|
$this->fps = Video::RATES[0];
|
||
|
foreach ( Video::RATES as $rate ) {
|
||
|
if ( $rate >= $infps ) {
|
||
|
$this->fps = $rate;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Each self-contained group of pictures starts with a keyframe.
|
||
|
$this->gop = $this->fps * self::SEGMENT_DURATION;
|
||
|
}
|
||
|
|
||
|
private function ffmpeg( $options, $outfile, $container ) {
|
||
|
if ( $mode === 'pass1' ) {
|
||
|
$filename = '/dev/null';
|
||
|
$playlist = '/dev/null';
|
||
|
} else {
|
||
|
$filename = "$outfile.%04d.$container";
|
||
|
$playlist = "$outfile.$container.m3u8";
|
||
|
}
|
||
|
$ffmpegOptions = array_merge( [
|
||
|
'-hide_banner',
|
||
|
'-i',
|
||
|
$this->source->filename,
|
||
|
'-f', 'hls',
|
||
|
'-hls_segment_type', 'fmp4',
|
||
|
'-hls_time', '10',
|
||
|
'-hls_playlist_type', 'vod',
|
||
|
'-hls_segment_filename', $filename,
|
||
|
], $options, [
|
||
|
'-y', $playlist
|
||
|
] );
|
||
|
|
||
|
$output = run( 'ffmpeg', $ffmpegOptions );
|
||
|
}
|
||
|
|
||
|
public function video( $codec, $resolution, $mode ) {
|
||
|
if ( !$this->source->video ) {
|
||
|
throw new Error('no video');
|
||
|
}
|
||
|
|
||
|
$res = Video::FORMATS[$codec]['resolutions'][$resolution];
|
||
|
|
||
|
$options = array_merge(
|
||
|
[
|
||
|
'-pix_fmt', 'yuv420p',
|
||
|
'-r', $this->fps,
|
||
|
],
|
||
|
Video::FORMATS[$codec]['options']['common'],
|
||
|
Video::FORMATS[$codec]['options'][$mode],
|
||
|
[
|
||
|
'-vf', "scale=" . implode( ':', [ $res['width'], $res['height'] ] ),
|
||
|
'-b:v', $res['bitrate'],
|
||
|
'-g', $this->gop,
|
||
|
'-keyint_min', $this->gop, // may not be generic enough
|
||
|
'-an',
|
||
|
]
|
||
|
);
|
||
|
|
||
|
$outfile = "{$this->source->filename}.{$resolution}.{$codec}.{$mode}";
|
||
|
$this->ffmpeg( $options, $outfile, "mp4" );
|
||
|
}
|
||
|
|
||
|
public function audio( $codec ) {
|
||
|
if ( !$this->source->audio ) {
|
||
|
throw new Error('no audio');
|
||
|
}
|
||
|
|
||
|
$format = Audio::FORMATS[$codec];
|
||
|
$options = array_merge(
|
||
|
$format['options'],
|
||
|
[
|
||
|
'-vn',
|
||
|
]
|
||
|
);
|
||
|
|
||
|
$outfile = "{$this->source->filename}.audio.{$codec}";
|
||
|
$this->ffmpeg( $options, $outfile, "mp4" );
|
||
|
}
|
||
|
|
||
|
}
|
||
|
|
||
|
|
||
|
$infiles = [
|
||
|
'caminandes-llamigos.webm',
|
||
|
];
|
||
|
|
||
|
foreach ( $infiles as $filename ) {
|
||
|
$source = new SourceFile( $filename );
|
||
|
$codec = new Transcoder( $source );
|
||
|
//$codec->audio('opus');
|
||
|
$codec->audio('mp3');
|
||
|
//$codec->audio('aac');
|
||
|
//$codec->audio('alac');
|
||
|
//$codec->audio('vorbis');
|
||
|
/*
|
||
|
foreach ( Video::FORMATS['vp9']['resolutions'] as $res => $format ) {
|
||
|
|
||
|
if ( $format['width'] <= $source->width && $format['height'] <= $source->height ) {
|
||
|
$codec->video('vp9', $res, 'fast');
|
||
|
$codec->video('vp9', $res, 'pass1');
|
||
|
$codec->video('vp9', $res, 'pass2');
|
||
|
}
|
||
|
}
|
||
|
*/
|
||
|
}
|