Add some overload methods of getXxxMetadata() with charset parameter.

[Konyaco]

No description provided.

[saudet]

How about having a property for that like setCharet()/getCharset()?
If we do it this way, it could also work well for FFmpegFrameRecorder.

[Konyaco]

How about having a property for that like setCharet()/getCharset()? If we do it this way, it could also work well for FFmpegFrameRecorder.

I think your solution is better. To be honestly, I haven't study other implementations, is it possible to add them to FrameGrabber/FrameRecorder as general methods?

[saudet]

Yes, that's the idea. We add "charset" fields in the parents, which we can use in the FFmpeg subclasses.

[Konyaco]

Yes, that's the idea. We add "charset" fields in the parents, which we can use in the FFmpeg subclasses.

I tried, and works fine. Should I make a new PR?

[saudet]

Great! Please do it in this PR. Thanks

[Konyaco]

Great! Please do it in this PR. Thanks

Uhh.. I am sorry that I don't know how to change the branch of PR, so I made a new PR here #1720