How do i get content lenght of actual video?

[thq919]

Thank you for great package! One small issue (im behind your front door OwO) joke
Im using flutter+dart, YT explode - flutter pub.dev version. Using just_audio package for playing audio streams. So when i creating AudioStreamSource from Just_Audio package, it`s requires content Length of actual video/audio, not actual bit length of stream retrieved from YT package.
How do i get actual content bit length of audio source?

[thq919]

/// The number of bytes returned in this response, or null if unknown. Note:
/// this may be different from the length of the entire media for a range
/// request.
final int? contentLength;