WIP playlist extraction for fmp4
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264
extract-playlist.php
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264
extract-playlist.php
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<?php
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class MP4Reader {
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/**
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* @var resource $file
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*/
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private $file;
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/**
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* @param string $filename
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*/
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public function __construct( $filename ) {
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$this->file = fopen( $filename, 'rb' );
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if ( !$this->file ) {
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throw new Exception( 'Failed to open MP4 input file' );
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}
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}
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function __destruct() {
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if ( $this->file ) {
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fclose( $this->file );
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$this->file = null;
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}
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}
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/**
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* @return int
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*/
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public function pos() {
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$pos = ftell( $this->file );
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if ( $pos === false ) {
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throw new Exception( 'Failed to read position in MP4 file' );
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}
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return $pos;
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}
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/**
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* @param int $length number of bytes to read
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* @return string|false raw bytes or false on eof
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*/
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public function readBytes( $length ) {
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$bytes = fread( $this->file, $length );
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if ( feof( $this->file ) ) {
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return false;
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}
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if ( $bytes === false || strlen( $bytes ) < $length ) {
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throw new Exception( "Failed to read $length bytes from MP4 file" );
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}
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return $bytes;
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}
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/**
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* @param int $length number of bytes to skip over
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*/
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private function skipBytes( $length ) {
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$retval = fseek( $this->file, $length, SEEK_CUR );
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if ( $retval < 0 ) {
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throw new Exception( "Failed to skip ahead $length bytes in MP4 file" );
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}
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}
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/**
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* @return int|false 32-bit integer value or false on eof
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*/
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public function read32() {
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$bytes = $this->readBytes( 4 );
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if ( $bytes === false ) {
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return $bytes;
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}
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$data = unpack( 'Nval', $bytes );
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return $data['val'];
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}
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/**
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* @return string|false 4-byte type code or false on eof
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*/
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public function readType() {
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return $this->readBytes( 4 );
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}
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/**
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* @param callable $callback in the form function(MP4Box)
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* @return mixed the return value from the callback, or false on eof
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*/
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public function readBox( $callback ) {
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$start = $this->pos();
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$size = $this->read32();
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if ( $size === false ) {
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return false;
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}
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$end = $start + $size;
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$type = $this->readType();
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if ( $type === false ) {
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return false;
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}
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$box = new MP4Box( $this, $start, $size, $type );
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$retval = call_user_func( $callback, $box );
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$remaining = $end - $this->pos();
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if ( $remaining > 0 ) {
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$this->skipBytes( $remaining );
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}
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return $retval;
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}
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}
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class MP4Box {
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private $reader;
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public $start;
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public $size;
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public $type;
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function __construct( MP4Reader $reader, $start, $size, $type ) {
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$this->reader = $reader;
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$this->start = $start;
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$this->size = $size;
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$this->type = $type;
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}
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private function pos() {
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return $this->reader->pos();
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}
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private function end() {
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return $this->start + $this->size;
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}
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private function remaining() {
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return $this->end() - $this->pos();
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}
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private function guard( $length ) {
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$remaining = $this->remaining();
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if ( $remaining < $length ) {
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throw new Exception( "Reading beyond end of box; had $remaining bytes, wanted $length" );
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}
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}
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public function readBytes( $length ) {
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$this->guard( $length );
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return $this->reader->readBytes( $length );
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}
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public function read32() {
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$this->guard( 4 );
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return $this->reader->read32();
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}
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public function readType() {
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$this->guard( 4 );
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return $this->reader->readType();
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}
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public function readBox( $callback ) {
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$this->guard( 8 );
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return $this->reader->readBox( $callback );
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}
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}
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function hexdump( $str ) {
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$out = '';
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$len = strlen( $str );
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for ( $i = 0; $i < $len; $i++ ) {
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$char = $str[$i];
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$byte = ord( $char );
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// really?
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$digits = str_pad( dechex( $byte ), 2, '0', STR_PAD_LEFT );
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$out .= $digits;
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}
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return $out;
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}
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function safestr( $str ) {
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$out = '';
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$len = strlen( $str );
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for ( $i = 0; $i < $len; $i++ ) {
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$char = $str[$i];
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$byte = ord( $char );
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if ( $byte >= 32 && $byte <= 126 ) {
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$out .= $char;
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} else {
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$out .= '.';
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}
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}
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return $out;
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}
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/**
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* @param string $filename - input MP4 file to read
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* @return array[] - list of segment info
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*/
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function extractFragmentedMP4( $filename ) {
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$segments = [];
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$mp4 = new MP4Reader( $filename );
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$eof = false;
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$init = false;
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while ( !$eof ) {
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$eof = !$mp4->readBox( function ( $box ) use ( &$segments, &$init ) {
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$bytes = $box->readBytes( $box->size - 8 );
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$bytes = substr( $bytes, 0, 16 );
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$hex = hexdump( $bytes );
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$safe = safestr( $bytes );
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print "box: {$box->type} at {$box->start}, {$box->size} bytes {$hex} {$safe}\n";
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/*
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Need to:
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- find the end of the moov; everything up to that is the initialization segment
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- https://www.w3.org/TR/mse-byte-stream-format-isobmff/#iso-init-segments
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- find the start of each styp+moof fragment
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- https://www.w3.org/TR/mse-byte-stream-format-isobmff/#iso-media-segments
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- find the start timestamp of each moof fragment
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- find the duration of each moof fragment
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moov.trak.mdia.mdhd.timescale - looks useful 12288 for 24fps?
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moov.trak.mdia.mdhd.duration - 0 on the moov
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moov.mvex.trex.default_sample_duration - 0 on the moov
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moof.traf.tfhd.default_sample_duration is 512 on these
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moof.traf.tfdt.baseMediaDecodeTime is 0 on the first, 122880 on the second frag (10 seconds in?)
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moof.mdat.sample_duration is empty here (uses default I guess?)
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moof.mdat.sample_composition_time_offset also empty
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opus has timescale 48000 in moov.trak.mdia.mdhd
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WARNING: opus is not dividing up fragments
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*/
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if ( $box->type === 'moof' ) {
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if ( !$init ) {
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$init = [
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'start' => 0,
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'size' => $box->start + $box->size,
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];
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$segments['init'] = $init;
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}
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array_push( $segments, [
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'start' => $box->start,
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'size' => $box->size,
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'timestamp' => 0.0,
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'duration' => 0.0,
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] );
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}
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return true;
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} );
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}
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return $segments;
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}
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$argv = $_SERVER['argv'];
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$self = array_shift( $argv );
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$filename = array_shift( $argv );
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$segments = extractFragmentedMP4( $filename );
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var_dump( $segments );
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37
make-fmp4.sh
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37
make-fmp4.sh
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interval=10
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MOVFLAGS="-movflags +frag_keyframe+empty_moov -force_key_frames expr:gte(t,n_forced*$interval)"
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AUDFLAGS="-movflags +empty_moov -frag_duration ${interval}000000"
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BITRATE_HI="-b:v 1250k"
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BITRATE_LO="-b:v 1000k"
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SIZE_MAIN="-s 854x480"
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VIDEO_H264="-vcodec h264 -g 240 $BITRATE_HI $SIZE_MAIN"
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VIDEO_VP9="-vcodec libvpx-vp9 -tile-columns 2 -row-mt 1 -cpu-used 3 -g 240 $BITRATE_LO $SIZE_MAIN"
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AUDIO_OPUS="-acodec libopus -ac 2 -ar 48000 -ab 96k"
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AUDIO_AAC="-ac 2 -ar 44100 -ab 128k"
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AUDIO_MP3="-acodec libmp3lame -ac 2 -ar 44100 -ab 128k"
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INFILE=caminandes-llamigos.webm
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set -e
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# Audio for HLS
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ffmpeg -i $INFILE -vn $AUDIO_MP3 -y fmp4.audio.mp3
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ffmpeg -i $INFILE -vn $AUDIO_AAC $AUDFLAGS -y fmp4.audio.aac.mp4
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ffmpeg -i $INFILE -vn $AUDIO_OPUS $AUDFLAGS -y fmp4.audio.opus.mp4
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# Video for HLS
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ffmpeg -i $INFILE -an $VIDEO_H264 $MOVFLAGS -pass 1 -y fmp4.video.h264.mp4
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ffmpeg -i $INFILE -an $VIDEO_H264 $MOVFLAGS -pass 2 -y fmp4.video.h264.mp4
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ffmpeg -i $INFILE -an $VIDEO_VP9 $MOVFLAGS -pass 1 -y fmp4.video.vp9.mp4
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ffmpeg -i $INFILE -an $VIDEO_VP9 $MOVFLAGS -pass 2 -y fmp4.video.vp9.mp4
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# Playlist processing
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#php extract-playlist.php fmp4.audio.mp3 fmp4.audio.mp3.m3u8
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#php extract-playlist.php fmp4.audio.aac.mp4 fmp4.audio.aac.mp4.m3u8
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#php extract-playlist.php fmp4.audio.opus.mp4 fmp4.audio.opus.mp4.m3u8
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#php extract-playlist.php fmp4.video.h264.mp4 fmp4.video.h264.mp4.m3u8
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#php extract-playlist.php fmp4.video.vp9.mp4 fmp4.video.vp9.mp4.m3u8
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