Exception with avio_alloc_context_read_packet::Invoke

[Sebanisu]

Managed Debugging Assistant 'CallbackOnCollectedDelegate' 
  Message=Managed Debugging Assistant 'CallbackOnCollectedDelegate' : 'A callback was made on a garbage collected delegate of type 'FFmpeg.AutoGen!FFmpeg.AutoGen.avio_alloc_context_read_packet::Invoke'. This may cause application crashes, corruption and data loss. When passing delegates to unmanaged code, they must be kept alive by the managed application until it is guaranteed that they will never be called.'

I am unsure why but after a sound is done playing I guess the delegate is being called by avio. It doesn't happen all the time. I have seen it twice today.

I added lock around the code in the fixed statement. This should prevent any dispose from being called before the code is done executing.

The system will not let me ffmpeg.avio_context_free(&Decoder._format->pb); It causes a CTD when ever I try.

I hope the lock helps. The error is so rare.

The only reason I am using avio_read_content. Is that it is the only way I found to read ADPCM sounds out of memory.

[Sebanisu]

I was thinking it could be related to the Task I added. It's possible the Delegate It's complaining about is something internal to ffmpeg.autogen. He uses delegates to reference various ffmpeg calls. Though I only use avio explicitly in one place. But unsure if it gets called automatically or not.

[Sebanisu]

I think i fixed this. I had a delegate defined in a method. And sometimes the delegate would get collected before we were done with it. Though sometimes this would never happen. So now the delegate is a field of the class so it should last as long as the class does. Oh and I upgraded ffmpeg.autogen to latest version incase that had something fixed in it. I plan to test linux before my next pull request.