openAdvanced doesn't include stream

[DawidWetzler]

Hi there,

I'm trying to open video to apply some advanced filters (complex filters) but it looks openAdvanced isn't properly working with MediaCollection.

I've shorten in completely to get the smallest reproducible version:

$media = new MediaCollection([
    Media::make('local', 'input.mp4'),
]);

$result = $ffmpeg->openAdvanced($media)
    ->export()
    ->toDisk('local')
    ->addFormatOutputMapping(new WebM(videoCodec: 'libvpx-vp9'), Media::make('local', 'output.webm'), [])
    ->dd();

// -y -threads 12 -vcodec libvpx-vp9 -b:v 1000k -acodec libvorbis -b:a 128k -f webm /var/www/html/storage/app/output.webm

Meanwhile this in raw phpffmpeg is working.

$ffmpeg = \FFMpeg\FFMpeg::create();
$video  = $ffmpeg->openAdvanced([storage_path('app/input.mp4')]);
$cmd = $video->map([], new WebM(videoCodec: 'libvpx-vp9'), storage_path('app/output.webm'))
            ->getFinalCommand();

dd($cmd);

//output: -y -i /var/www/html/storage/app/input.mp4 -map  -vcodec libvpx-vp9 -acodec libvorbis -b:a 128k -f webm /var/www/html/storage/app/output.webm

I'm not sure what's causing this but the chain led to ->open method where the media collection this is already empty.

This results in Output file #0 does not contain any stream. error from ffmpeg.