Wednesday 24 October 2018

How to add formated text on video using php-ffmpeg?

How to add formated text on video using php-ffmpeg?

Question: What is drawtext on video?
Adding the single line text/multiple line text over the video.



Question: Can we change the font-size of text?
Yes, we can change the color, size, font family etc of text in videos.



Question: How to add text on videos?
ffmpeg -i myvideo.mp4 -vf drawtext="fontfile=OpenSans-Bold.ttf: text=this is text on videos: fontcolor=white: fontsize=120: box=1: boxcolor=black@0.5: boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2" -codec:a copy output_video.mp4

Note: OpenSans-Bold.ttf file must available (with parallel to video i.e myvideo.mp4)



Question: How to multiple line text on videos?
ffmpeg -i myvideo.mp4 -vf "[in]drawtext=fontfile=OpenSans-Bold.ttf: text=Arun kumar: fontcolor=white: fontsize=20: box=1: boxcolor=black@0.5: boxborderw=5: x=100: y=100 drawtext=fontfile=OpenSans-Bold.ttf: text='Kuldeep ': fontcolor=white: fontsize=20: box=1: boxcolor=black@0.5: boxborderw=5: x=100: y=400[output]" -codec:a copy output_video.mp4

Note: OpenSans-Bold.ttf file must available (with parallel to video i.e myvideo.mp4)




Question: How to add text in video with PHP?
  1. You must have installed PHP-FFMPEG 
    php composer.phar require php-ffmpeg/php-ffmpeg
    If not, you can check https://www.web-technology-experts-notes.in/2017/10/how-to-install-ffmpeg-in-wamp-server-in-windows7.html
  2. To achieve this, you need to use the ffmpeg filters.
  3. require_once 'ffmpeglib/vendor/autoload.php';
$ffmpeg = FFMpeg\FFMpeg::create();
$format = new FFMpeg\Format\Video\X264();
 $format->setAudioCodec("aac");  
$videoFile='myvideo.mp4';
$captionStaticFilePath='';//directory path
$captionStaticFilePath=$_SERVER['DOCUMENT_ROOT'].'/video/';

/////////////// Debug ////////////////////////////
/*$ffmpeg->getFFMpegDriver()->listen(new \Alchemy\BinaryDriver\Listeners\DebugListener());
$ffmpeg->getFFMpegDriver()->on('debug', function ($message) {
    echo $message;
});*/
/////////////// Debug ////////////////////////////                

/* Filter the text correctly*/ 
$captionJSON=json_decode('["text=This is caption text: fontfile=OpenSans-Regular.ttf: x=384: y=10: fontcolor=#ffffff: fontsize=24px","text=This is clip 2 - Samik das: fontfile=OpenSans-Bold.ttf: x=404.08331298828125: y=34.91668701171875: fontcolor=#ffffff: fontsize=24px: fonttype=bold"]');
$captionArray=array();
if(!empty($captionJSON) && !empty($captionJSON)){
    foreach($captionJSON as $caption){
        //String to array
        $caption=str_replace(':', '&', $caption);
        parse_str($caption, $output);
        //pr($output);die;

        unset($output['fonttype']);
        $output['fontsize']=str_replace('px','',$output['fontsize']);
        $output['fontfile']=$captionStaticFilePath.$output['fontfile'];

        $output['x'] = (int)$output['x'];
        $output['y'] = (int)$output['y'];

        //Array to string
        $outputStr='';
        $counter=0;
        foreach($output as $i=>$v){
            if($counter){
                $outputStr.= ': ';
            }
            $outputStr.= $i.'='.$v;
            $counter++;
        }
        //Update to array                            
        $captionArray[]=$outputStr;
    }
}
/* Filter the text correctly*/ 


try{
    $video = $ffmpeg->open($captionStaticFilePath.$videoFile);
    $command='';
    if(!empty($captionArray)){
        $command='[in]';
        foreach($captionArray as $index=>$captionComand){
            if($index>0){
                $command= $command.',';
            }
            $command= $command.'drawtext='.$captionComand;
        }
        $command.='[out]';


    }

    //nOW execute the command
    $video->filters()->custom($command);
    $captionFile='caption_'.$videoFile;
    //Save the video with caption
    $video->save($format, $captionStaticFilePath.$captionFile);
    die('done');
}catch(Exception $e){
    echo $e->getMessage();die;
}

Question: How to add debugging in php-ffmpeg?
Just add below code after the initialize the ffmpeg object. 

$ffmpeg->getFFMpegDriver()->listen(new \Alchemy\BinaryDriver\Listeners\DebugListener());
$ffmpeg->getFFMpegDriver()->on('debug', function ($message) {
    echo $message;
});



Question: Share Few useful urls for drawtext?
https://www.ffmpeg.org/ffmpeg-all.html#fade
https://ffmpeg.org/ffmpeg-filters.html


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