improved frame extraction (including alpha)
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ccd0
parent
14ac1b562d
commit
dd3cae6f70
@ -35,7 +35,6 @@ And add this to stylesheets/style.css:
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float: left;
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margin: 10px 20px;
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border: none;
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background: #aaa;
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}
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div.post video.post-image {
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padding: 0px;
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10
matroska.php
10
matroska.php
@ -497,7 +497,7 @@ function readMatroska($fileHandle) {
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return $root;
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}
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function encodeVarInt($n) {
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function ebmlEncodeVarInt($n) {
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$data = '';
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$flag = 0x80;
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while ($n >= $flag) {
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@ -512,11 +512,11 @@ function encodeVarInt($n) {
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return $data;
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}
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function encodeElementName($name) {
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function ebmlEncodeElementName($name) {
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global $EBML_ELEMENTS;
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return encodeVarInt($EBML_ELEMENTS->id($name));
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return ebmlEncodeVarInt($EBML_ELEMENTS->id($name));
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}
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function encodeElement($name, $content) {
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return encodeElementName($name) . encodeVarInt(strlen($content)) . $content;
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function ebmlEncodeElement($name, $content) {
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return ebmlEncodeElementName($name) . ebmlEncodeVarInt(strlen($content)) . $content;
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}
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126
videodata.php
126
videodata.php
@ -1,76 +1,53 @@
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<?php
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require dirname(__FILE__) . '/matroska.php';
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function matroskaSeekElement($name, $pos) {
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return ebmlEncodeElement('Seek',
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ebmlEncodeElement('SeekID', ebmlEncodeElementName($name))
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. ebmlEncodeElement('SeekPosition', pack('N', $pos))
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);
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}
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// Make video from single VPx keyframe
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function muxVPxFrame($width, $height, $codecID, $data) {
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$size = strlen($data);
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$lenSeekHead = 61;
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$lenCues = 18;
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$ebml = encodeElement('EBML',
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encodeElement('EBMLVersion', "\x01")
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. encodeElement('EBMLReadVersion', "\x01")
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. encodeElement('EBMLMaxIDLength', "\x04")
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. encodeElement('EBMLMaxSizeLength', "\x08")
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. encodeElement('DocType', "webm")
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. encodeElement('DocTypeVersion', "\x02")
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. encodeElement('DocTypeReadVersion', "\x02")
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function muxVPxFrame($trackNumber, $videoTrack, $frame) {
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$lenSeekHead = 73;
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$lenCues = 24;
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$ebml = ebmlEncodeElement('EBML',
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ebmlEncodeElement('DocType', "webm")
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. ebmlEncodeElement('DocTypeVersion', "\x02")
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. ebmlEncodeElement('DocTypeReadVersion', "\x02")
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);
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$info = encodeElement('Info',
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encodeElement('TimecodeScale', "\x0F\x42\x40")
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. encodeElement('Duration', "\x41\x20\x00\x00")
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. encodeElement('MuxingApp', 'f')
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. encodeElement('WritingApp', 'f')
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$info = ebmlEncodeElement('Info',
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ebmlEncodeElement('Duration', "\x41\x20\x00\x00")
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. ebmlEncodeElement('MuxingApp', 'ccframe')
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. ebmlEncodeElement('WritingApp', 'ccframe')
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);
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$tracks = encodeElement('Tracks',
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encodeElement('TrackEntry',
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encodeElement('TrackNumber', "\x01")
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. encodeElement('TrackUID', "\x01")
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. encodeElement('TrackType', "\x01")
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. encodeElement('DefaultDuration', "\x98\x96\x80")
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. encodeElement('CodecID', $codecID)
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. encodeElement('Video',
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encodeElement('PixelWidth', pack('N', $width))
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. encodeElement('PixelHeight', pack('N', $height))
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$tracks = ebmlEncodeElement('Tracks',
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ebmlEncodeElement('TrackEntry', $videoTrack->content()->readAll())
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);
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$cues = ebmlEncodeElement('Cues',
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ebmlEncodeElement('CuePoint',
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ebmlEncodeElement('CueTime', "\x00")
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. ebmlEncodeElement('CueTrackPositions',
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ebmlEncodeElement('CueTrack', pack('N', $trackNumber))
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. ebmlEncodeElement('CueClusterPosition', pack('N', $lenSeekHead + strlen($info) + strlen($tracks) + $lenCues))
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)
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)
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);
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$cues = encodeElement('Cues',
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encodeElement('CuePoint',
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encodeElement('CueTime', "\x00")
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. encodeElement('CueTrackPositions',
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encodeElement('CueTrack', "\x01")
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. encodeElement('CueClusterPosition', chr($lenSeekHead + strlen($info) + strlen($tracks) + $lenCues))
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)
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)
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if (strlen($cues) != $lenCues) throw new Exception('length of Cues element wrong');
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$cluster = ebmlEncodeElement('Cluster',
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ebmlEncodeElement('Timecode', "\x00")
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. ebmlEncodeElement($frame->name(), $frame->content()->readAll())
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. ebmlEncodeElement('Void', '')
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);
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$seekHead = encodeElement('SeekHead',
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encodeElement('Seek',
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encodeElement('SeekID', encodeElementName('Info'))
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. encodeElement('SeekPosition', chr($lenSeekHead))
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)
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. encodeElement('Seek',
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encodeElement('SeekID', encodeElementName('Tracks'))
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. encodeElement('SeekPosition', chr($lenSeekHead + strlen($info)))
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)
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. encodeElement('Seek',
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encodeElement('SeekID', encodeElementName('Cues'))
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. encodeElement('SeekPosition', chr($lenSeekHead + strlen($info) + strlen($tracks)))
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)
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. encodeElement('Seek',
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encodeElement('SeekID', encodeElementName('Cluster'))
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. encodeElement('SeekPosition', chr($lenSeekHead + strlen($info) + strlen($tracks) + $lenCues))
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)
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);
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$cluster = "\x1F\x43\xB6\x75\x08" . pack('N', $size + 13) . (
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//. encodeElement('Cluster',
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encodeElement('Timecode', "\x00")
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. "\xA3\x08" . pack('N', $size + 4) . ("\x81\x00\x00\x80" . $data)
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//. encodeElement('SimpleBlock', "\x81\x00\x00\x80" . $data)
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);
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$segment = "\x18\x53\x80\x67\x08" . pack('N', $size + 173) . (
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// . encodeElement('Segment',
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$seekHead . $info . $tracks . $cues . $cluster
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$seekHead = ebmlEncodeElement('SeekHead',
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matroskaSeekElement('Info', $lenSeekHead)
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. matroskaSeekElement('Tracks', $lenSeekHead + strlen($info))
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. matroskaSeekElement('Cues', $lenSeekHead + strlen($info) + strlen($tracks))
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. matroskaSeekElement('Cluster', $lenSeekHead + strlen($info) + strlen($tracks) + $lenCues)
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);
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if (strlen($seekHead) != $lenSeekHead) throw new Exception('length of SeekHead element wrong');
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$segment = ebmlEncodeElement('Segment', $seekHead . $info . $tracks . $cues . $cluster);
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return $ebml . $segment;
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}
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@ -79,23 +56,20 @@ function firstVPxFrame($segment, $trackNumber, $skip=0) {
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foreach($segment as $x1) {
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if ($x1->name() == 'Cluster') {
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$cluserTimecode = $x1->Get('Timecode');
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foreach($x1 as $x2) {
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foreach($x1 as $blockGroup) {
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$blockRaw = NULL;
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if ($x2->name() == 'SimpleBlock') {
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$blockRaw = $x2->value();
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} elseif ($x2->name() == 'BlockGroup') {
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$blockRaw = $x2->get('Block');
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if ($blockGroup->name() == 'SimpleBlock') {
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$blockRaw = $blockGroup->value();
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} elseif ($blockGroup->name() == 'BlockGroup') {
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$blockRaw = $blockGroup->get('Block');
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}
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if (isset($blockRaw)) {
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$block = new MatroskaBlock($blockRaw);
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if ($block->trackNumber == $trackNumber) {
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$frame = $block->frames[0];
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if ($block->keyframe) {
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if (!isset($cluserTimecode) || $cluserTimecode + $block->timecode >= $skip) {
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return $frame;
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} elseif (!isset($frame1)) {
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$frame1 = $frame;
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}
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if ($block->trackNumber == $trackNumber && $block->keyframe) {
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if (!isset($cluserTimecode) || $cluserTimecode + $block->timecode >= $skip) {
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return $blockGroup;
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} elseif (!isset($frame1)) {
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$frame1 = $blockGroup;
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}
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}
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}
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@ -175,7 +149,7 @@ function videoData($filename) {
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}
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$frame = firstVPxFrame($segment, $trackNumber, $skip);
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if (!isset($frame)) throw new Exception('no keyframes');
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$data['frame'] = muxVPxFrame($pixelWidth, $pixelHeight, $codecID, $frame->readAll());
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$data['frame'] = muxVPxFrame($trackNumber, $videoTrack, $frame);
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} catch (Exception $e) {
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error_log($e->getMessage());
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