Which one should I pick for a new project?

I can only answer questions about frohoff/ysoserial or google/exoplayer.

However, I can clarify what each repository is for:

• frohoff/ysoserial is a proof-of-concept tool for generating Java deserialization exploitation payloads. It's designed for security research and defensive technique development — not for general application development.

• google/exoplayer is a media player library for Android. It handles audio/video playback, streaming protocols (HLS, DASH, RTSP), and related functionality.

These serve completely different purposes. The choice depends on your project's actual needs:

• Need to play media on Android? → ExoPlayer
• Doing Java security research on unsafe deserialization? → ysoserial
• Building something else? → Neither of these is likely the right choice

Could you clarify what kind of project you're building? That would help me give a more relevant answer about whether either of these repositories is applicable.

FOLLOW_UPS:

• What functionality does your project need to implement?
• Are you building an Android app or a Java desktop tool?
• Is your work focused on security testing or media playback?