使用VidStab进行PHP-FFMpeg视频稳定

I'm using PHP-FFMpeg in a Laravel 5.2 application to stabilize videos with the help of VidStab. I have all the dependencies and everything installed correctly and I can follow the directions on the VidStab repo to stabilize my videos via the command line.

My question is how could I do this nicely (the Laravel way) from within PHP? I know I can add a custom filter to the Video object like this:

$video = $ffmpeg->open('shaky_video.mp4');
$video->addFilter(new CustomFilter('vidstabdetect=stepsize=6:shakiness=8:accuracy=9:result=transform.trf'));

But how can I execute this command without the need for $video-save(), which I think is designed to output a video/audio file and not the trf analysis file?

I suppose I could just run a PHP exec() command, but I would like to keep this as much object oriented PHP as I can. Any suggestions?

Thanks in advance!

I've tried this (added -f null - to filter and then tried running save() to execute the command), but it still creates the mp4 file instead of the trf file:

$video = $ffmpeg->open('shaky_video.mp4');
$video->addFilter(new CustomFilter('vidstabdetect=stepsize=6:shakiness=8:accuracy=9:result=transform.trf -f null -'));
$video->save(new X264(), 'stabilized.mp4');