AV_CH_LAYOUT_ defines are int instead of long

[ishitatsuyuki]

They're weakly typed in C relying on the integer type auto conversion (and this applies to Java as well).

However, inside Kotlin this creates a problem as conversion must be explicit and it gives you a bad feeling to manually cast a constant.

[saudet]

That could easily be fixed, would like to give it a try?

[ishitatsuyuki]

I have no experience with javacpp internals, can you give some hint?

[saudet]

There's already one specified on the line below, we could do the rest:
https://github.com/bytedeco/javacpp-presets/blob/master/ffmpeg/src/main/java/org/bytedeco/javacpp/presets/avutil.java#L58

[ishitatsuyuki]

Got it, will open a PR when I get to my computer.