Duration on web returns null (and breaks code)

[sunilguptasg]

Uint8List byteString = await pickedFile.readAsBytes(); <<pickedFile is XFile
Metadata videoMetaData = await MetadataRetriever.fromBytes(byteString);
int? dur = videoMetaData.trackDuration; << returns null

Note: I have added this script in the section of index.html

<script type="text/javascript" src="https://unpkg.com/mediainfo.js/dist/mediainfo.min.js"></script>

also the code crashes on this line
line 110 of flutter_media_metadata_web.dart:'albumArt': base64Decode(rawMetadataJson['Cover_Data']),

I'm basically struggling to get the duration of a picked video file on the web.

[alexmercerind]

Feel free to submit a fix. I never used web in any of my Flutter projects, it's just something I added to complete the set.
Other than that, I wouldn't use this to get duration, but official web audio or video APIs, primary purpose of this plugin is to read tags.