hls live transcoding

AbstractProcess.php

<?php

namespace App\Transcode\FFMpeg;

use Illuminate\Support\Arr;
use Symfony\Component\Process\Process;

abstract class AbstractProcess
{
    abstract protected function getBinaryPath(): string;

    protected function getProcess(array $args): Process
    {
        $file = $args[0];
        unset($args[0]);

        if (!is_file($file) || !is_readable($file)) {
            throw new \RuntimeException('Could not read file at ' . $file);
        }

        $cmd = array_merge([$this->getBinaryPath()], is_array($args) ? Arr::flatten($args, 1) : $args);
        $cmd[] = ' ' . $file;

        $cmd = escapeshellcmd(implode(' ', $cmd));

        return Process::fromShellCommandline(
            $cmd,
            null,
            null,
            null,
            300
            );

        return new Process($cmd);
    }
}

Frame.php

<?php

namespace App\Transcode\FFMpeg\Output;

use Spatie\DataTransferObject\DataTransferObject;

class Frame extends DataTransferObject
{
    /** @var string */
    public $type;

    /** @var float|int */
    public $pkt_pts_time;

    /** @var float */
    public $best_effort_timestamp_time;

    /** @var int */
    public $pkt_pos;

    /** @var int */
    public $pkt_size;

    /** @var string */
    public $pict_type;

    public function __construct(array $parameters = [])
    {
        foreach ($parameters as $parameter => $value)
        {
            if (in_array($parameter, ['pkt_pts_time', 'best_effort_timestamp_time'])) {
                $parameters[$parameter] = (float)$value;
            }

            if (in_array($parameter, ['pkt_pos', 'pkt_size']))
            {
                $parameters[$parameter] = (int)$value;
            }
        }

        parent::__construct($parameters);
    }
}

HlsController.php

<?php

namespace App\Http\Controllers\Transcode;

use App\Http\Controllers\Controller;
use App\Models\Video;
use App\Transcode\FFMpeg\Probe;
use App\Transcode\HlsIframePlaylist;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\File;

class HlsController extends Controller
{
    public function getPlaylist(Request $request, string $id)
    {
        $video = Video::whereId($id)->firstOrFail();

        $playlist = (new HlsIframePlaylist)->buildPlaylist($video);

        return response($playlist, 200, [
            'Content-Type' => 'application/x-mpegURL',
        ]);
    }
}

HlsIframePlaylist.php

<?php

namespace App\Transcode;

use App\Models\Video;
use App\Transcode\FFMpeg\Output\Frame;

class HlsIframePlaylist
{
    public function buildPlaylist(Video $video, $targetDuration = 10): string
    {
        if ($video->playlist) {
            return $video->playlist;
        }

        $iframeData = $this->createIframeSegments($video->getIframes());
        $playlist = <<<EOS
#EXTM3U
#EXT-X-TARGETDURATION:{$targetDuration}
#EXT-X-VERSION:4
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-I-FRAMES-ONLY
#EXT-X-PLAYLIST-TYPE:VOD
EOS;

        foreach ($iframeData as $index => [$seg_duration, $pkt_size, $pkt_pos, $pkt_time]) {
            $playlist .= $this->byteRangeChunk(
                $seg_duration,
                $pkt_size,
                $pkt_pos,
                $video->id . '.ts'
            );
        }

        $playlist .= "\n#EXT-X-ENDLIST";

        $video->playlist = $playlist;
        $video->save();

        return $playlist;
    }

    protected function createIframeSegments(array $packetsAndFrames)
    {
        [$packets, $frames] = $packetsAndFrames;
        $next_pkt_pts_time = null;
        $iframeCount = count($frames);

        $iframesData = [];

        /**
         * @var int $index
         * @var Frame $iframe
         */
        foreach ($frames as $index => $iframe) {
            $pkt_pts_time = $next_pkt_pts_time || $iframe->pkt_size;

            if ($index < $iframeCount - 1) {
                $extinf = bcsub($frames[$index + 1]->best_effort_timestamp_time, $iframe->best_effort_timestamp_time, 5);
            } else {
                $last_frame_time = end($frames)->best_effort_timestamp_time;
                $extinf = bcsub($last_frame_time, $iframe->best_effort_timestamp_time, 5);
            }

            $iframesData[] = [
                $extinf,
                $iframe->pkt_size,
                $iframe->pkt_pos,
                (float)number_format($pkt_pts_time, 5),
            ];
        }

        return $iframesData;
    }

    protected function byteRangeChunk($duration, $size, $pos, $file)
    {
        $byterange = "$size@$pos";

        return "\n#EXTINF:$duration,"
            . "\n#EXT-X-BYTERANGE:$byterange\n"
            . route('hls.stream', [
                'video'     => $file,
                'byterange' => urlencode($byterange),
            ]);

    }
}

Packet.php

<?php

namespace App\Transcode\FFMpeg\Output;

use Spatie\DataTransferObject\DataTransferObject;

class Packet extends DataTransferObject
{
    /** @var string */
    public $type;

    /** @var string */
    public $codec_type;

    /** @var float */
    public $pts_time;

    /** @var int */
    public $pos;

    public function __construct(array $parameters = [])
    {
        foreach ($parameters as $parameter => $value) {
            if ($parameter === 'pts_time') {
                $parameters[$parameter] = (float)$value;
            }

            if ($parameter === 'pos') {
                $parameters[$parameter] = (int)$value;
            }
        }

        parent::__construct($parameters);
    }
}

playlist.m3u8

#EXTM3U
#EXT-X-TARGETDURATION:10
#EXT-X-VERSION:4
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-I-FRAMES-ONLY
#EXT-X-PLAYLIST-TYPE:VOD
#EXTINF:8.33333,
#EXT-X-BYTERANGE:1116@236997
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=1116%2540236997
#EXTINF:7.90000,
#EXT-X-BYTERANGE:200477@2155641
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=200477%25402155641
#EXTINF:3.86666,
#EXT-X-BYTERANGE:491651@7764158
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=491651%25407764158
#EXTINF:7.30000,
#EXT-X-BYTERANGE:139243@9938214
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=139243%25409938214
#EXTINF:8.33333,
#EXT-X-BYTERANGE:547319@11385326
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=547319%254011385326
#EXTINF:3.96666,
#EXT-X-BYTERANGE:536936@17259730
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=536936%254017259730
#EXTINF:8.33333,
#EXT-X-BYTERANGE:354768@19863234
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=354768%254019863234
#EXTINF:4.03333,
#EXT-X-BYTERANGE:257759@22381467
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=257759%254022381467
#EXTINF:8.33333,
#EXT-X-BYTERANGE:397608@23582676
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=397608%254023582676
#EXTINF:4.63333,
#EXT-X-BYTERANGE:105090@27059058
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=105090%254027059058
#EXTINF:3.13333,
#EXT-X-BYTERANGE:140856@27818926
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=140856%254027818926
#EXTINF:5.60000,
#EXT-X-BYTERANGE:331704@28534159
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=331704%254028534159
#EXTINF:1.90000,
#EXT-X-BYTERANGE:234508@30585761
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=234508%254030585761
#EXTINF:2.16666,
#EXT-X-BYTERANGE:421589@30984547
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=421589%254030984547
#EXTINF:2.06666,
#EXT-X-BYTERANGE:98867@31675106
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=98867%254031675106
#EXTINF:4.43333,
#EXT-X-BYTERANGE:285812@32420439
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=285812%254032420439
#EXTINF:8.33333,
#EXT-X-BYTERANGE:130415@35330810
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=130415%254035330810
#EXTINF:1.43333,
#EXT-X-BYTERANGE:215534@37233295
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=215534%254037233295
#EXTINF:1.66666,
#EXT-X-BYTERANGE:269017@37587388
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=269017%254037587388
#EXTINF:8.33333,
#EXT-X-BYTERANGE:235075@38475983
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#EXTINF:4.16666,
#EXT-X-BYTERANGE:463454@39786703
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=463454%254039786703
#EXTINF:8.33333,
#EXT-X-BYTERANGE:115667@41246719
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=115667%254041246719
#EXTINF:5.73333,
#EXT-X-BYTERANGE:56969@43252190
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=56969%254043252190
#EXTINF:2.90000,
#EXT-X-BYTERANGE:269913@45355451
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=269913%254045355451
#EXTINF:2.60000,
#EXT-X-BYTERANGE:204815@46837960
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#EXTINF:3.40000,
#EXT-X-BYTERANGE:229270@47880429
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=229270%254047880429
#EXTINF:8.33333,
#EXT-X-BYTERANGE:253025@48789297
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=253025%254048789297
#EXTINF:8.33333,
#EXT-X-BYTERANGE:266944@51669856
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=266944%254051669856
#EXTINF:2.83333,
#EXT-X-BYTERANGE:203013@55013957
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=203013%254055013957
#EXTINF:2.73333,
#EXT-X-BYTERANGE:876612@55949169
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=876612%254055949169
#EXTINF:6.90000,
#EXT-X-BYTERANGE:313572@57120897
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=313572%254057120897
#EXTINF:4.83333,
#EXT-X-BYTERANGE:395026@59617927
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=395026%254059617927
#EXTINF:1.46666,
#EXT-X-BYTERANGE:304506@60682166
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=304506%254060682166
#EXTINF:1.00000,
#EXT-X-BYTERANGE:108734@61384299
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=108734%254061384299
#EXTINF:2.93333,
#EXT-X-BYTERANGE:312382@61709061
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=312382%254061709061
#EXTINF:1.76666,
#EXT-X-BYTERANGE:146588@62856106
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=146588%254062856106
#EXTINF:1.56666,
#EXT-X-BYTERANGE:294259@63211538
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=294259%254063211538
#EXTINF:6.56666,
#EXT-X-BYTERANGE:113003@63990927
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=113003%254063990927
#EXTINF:1.60000,
#EXT-X-BYTERANGE:257551@65322540
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=257551%254065322540
#EXTINF:2.76666,
#EXT-X-BYTERANGE:259248@66340007
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=259248%254066340007
#EXTINF:8.33333,
#EXT-X-BYTERANGE:271612@67205422
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=271612%254067205422
#EXTINF:5.83333,
#EXT-X-BYTERANGE:155380@71409468
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=155380%254071409468
#EXTINF:2.26666,
#EXT-X-BYTERANGE:96993@73607648
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=96993%254073607648
#EXTINF:2.90000,
#EXT-X-BYTERANGE:127215@74942282
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=127215%254074942282
#EXTINF:4.33333,
#EXT-X-BYTERANGE:188788@75541950
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=188788%254075541950
#EXTINF:1.76666,
#EXT-X-BYTERANGE:159486@76826521
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=159486%254076826521
#EXTINF:1.53333,
#EXT-X-BYTERANGE:191336@77173651
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=191336%254077173651
#EXTINF:1.40000,
#EXT-X-BYTERANGE:151381@77832313
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=151381%254077832313
#EXTINF:4.93333,
#EXT-X-BYTERANGE:157407@78218674
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=157407%254078218674
#EXTINF:6.70000,
#EXT-X-BYTERANGE:161860@81597562
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=161860%254081597562
#EXTINF:3.30000,
#EXT-X-BYTERANGE:95191@83539249
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=95191%254083539249
#EXTINF:2.46666,
#EXT-X-BYTERANGE:682367@84261876
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=682367%254084261876
#EXTINF:3.66666,
#EXT-X-BYTERANGE:128344@86235867
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=128344%254086235867
#EXTINF:2.53333,
#EXT-X-BYTERANGE:612818@87557879
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=612818%254087557879
#EXTINF:8.33333,
#EXT-X-BYTERANGE:196327@88440986
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=196327%254088440986
#EXTINF:1.23333,
#EXT-X-BYTERANGE:158218@90213316
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=158218%254090213316
#EXTINF:1.46666,
#EXT-X-BYTERANGE:560512@90701653
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=560512%254090701653
#EXTINF:7.26666,
#EXT-X-BYTERANGE:423157@92030120
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=423157%254092030120
#EXTINF:1.23333,
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http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=79874%254095625809
#EXTINF:1.66666,
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http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=76807%254095960562
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http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=380137%254096730376
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http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=228358%2540101105883
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#EXTINF:7.50000,
#EXT-X-BYTERANGE:581891@110626283
http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=581891%2540110626283
#EXTINF:3.33333,
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#EXTINF:2.00000,
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http://127.0.0.1:8000/stream/bbb_sunflower_1080p_30fps_normal.mp4?byterange=243914%2540124462924
#EXTINF:2.96666,
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#EXT-X-BYTERANGE:242443@132239342
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#EXTINF:5.43333,
#EXT-X-BYTERANGE:141449@133116714
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#EXTINF:8.33333,
#EXT-X-BYTERANGE:271537@139341026
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#EXTINF:8.33333,
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#EXTINF:1.40000,
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#EXT-X-BYTERANGE:316713@155982381
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#EXTINF:2.96666,
#EXT-X-BYTERANGE:387155@156718059
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#EXTINF:8.33333,
#EXT-X-BYTERANGE:222487@158765813
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#EXTINF:1.30000,
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#EXTINF:8.33333,
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#EXT-X-ENDLIST

Probe.php

<?php

namespace App\Transcode\FFMpeg;

use App\Transcode\FFMpeg\Output\AudioStreamOutput;
use App\Transcode\FFMpeg\Output\Frame;
use App\Transcode\FFMpeg\Output\Packet;
use App\Transcode\FFMpeg\Output\ProbeOutput;
use App\Transcode\FFMpeg\Output\VideoStreamFrameOutput;
use App\Transcode\FFMpeg\Output\VideoStreamOutput;
use Symfony\Component\Process\Exception\ProcessFailedException;

class Probe extends AbstractProcess
{
    public const TYPE_STREAMS = 'streams';
    public const TYPE_FORMAT = 'format';
    public const TYPE_VIDEO_FORMAT = 'video_format';

    /**
     * @param string $filePath
     *
     * @return null|ProbeOutput
     * @throws ProcessFailedException
     * @throws \RuntimeException
     */
    public function format(string $filePath)
    {
        return $this->probe($filePath, '-show_format', self::TYPE_FORMAT);
    }

    /**
     * @param string $filePath
     *
     * @return (AudioStreamOutput|AudioStreamOutput)[]|null
     */
    public function streams(string $filePath)
    {
        return $this->probe($filePath, '-show_streams', self::TYPE_STREAMS);
    }

    /**
     * @param string $filePath
     *
     * @return array
     */
    public function frames(string $filePath)
    {
        $flags = [
            '-loglevel',
            'error',
            '-select_streams',
            'v',
            '-skip_frame',
            'nokey',
            '-show_entries',
            'packet=pts_time,codec_type,pos:frame=pict_type,pkt_pts_time,pkt_size,pkt_pos,best_effort_timestamp_time',
            '-of',
            'json',
        ];

        $probe = $this->probe($filePath, $flags, self::TYPE_VIDEO_FORMAT);
        $probe = json_decode($probe, true);

        $packets = [];
        $frames = [];

        foreach ($probe['packets_and_frames'] as $item) {
            if ($item['type'] === 'packet' && $item['codec_type'] === 'video') {
                $packets[] = new Packet($item);
            }

            if ($item['type'] === 'frame' && $item['pict_type'] === 'I') {
                $frames[] = new Frame($item);
            }
        }

        return [$packets, $frames];
    }

    /**
     * @param string $filePath
     * @param string|array $command
     * @param string $type
     * @param bool $json
     *
     * @return ProbeOutput|VideoStreamFrameOutput|AudioStreamOutput|VideoStreamOutput|null
     */
    protected function probe(string $filePath, $command, string $type, $json = false)
    {
        if (!is_file($filePath)) {
            throw new \RuntimeException('File does not exist at ' . $filePath);
        }

        $args = [0 => $filePath, 1 => $command];
        if ($json) {
            $args[] = '-print_format json';
            $args[] = 'json';
        }

        $proc = $this->getProcess($args);

        $proc->mustRun();

        switch ($type) {
            case self::TYPE_FORMAT:
                $outputParser = new ProbeFormatOutputParser();
                break;
            case self::TYPE_STREAMS:
                $outputParser = new ProbeStreamsOutputParser();
                break;
            case self::TYPE_VIDEO_FORMAT:
                $outputParser = new ProbeVideoFormatOutputParser();
                break;
        }

        if (!isset($outputParser)) {
            return null;
        }

        return $outputParser->parse($proc->getOutput());
    }

    protected function getBinaryPath(): string
    {
        return config('transcoding.ffprobe_bin');
    }
}