NatcorderAndroidCrashExample.cs

using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using NatSuite.Recorders;
using NatSuite.Recorders.Clocks;

public class NatcorderAndroidCrashExample : MonoBehaviour
{
    private void Start()
    {
        //for ease of operation, generate video from the Start method
        GenerateVideo();
    }

    //hookup to a button or call from Start()
    public void GenerateVideo()
    {
        Debug.LogFormat("creating demo texture2d pixels");
        Texture2D demoTexture = new Texture2D(VIDEO_WIDTH, VIDEO_HEIGHT);
        Color32[] demoPixels = demoTexture.GetPixels32();

        MP4Recorder natcorder = new MP4Recorder(VIDEO_WIDTH, VIDEO_HEIGHT, FRAMERATE,
                AUDIO_FREQ, AUDIO_CHANNELS);

        //run on a separate thread
        Task encodeTask = Task.Run(new Func<Task>(async () => { await GenerateVideoTask(demoPixels, natcorder); } ));
    }

    private async Task GenerateVideoTask(Color32[] demoPixels, MP4Recorder natcorder)
    {
        Debug.LogFormat("creating natcorder mp4 recorder with audio");

        int audioSamplesPerVideoFrame = AUDIO_FREQ / (int)FRAMERATE; //a clean 1470 at 30fps 44.1khz in this case

        Debug.LogFormat("creating demo audio samples for all frames");  

        int totalFrames = (int)(LENGTH_SECONDS * FRAMERATE);
        float[] demoAudioSamples = new float[audioSamplesPerVideoFrame * totalFrames];

        FixedIntervalClock natclock = new FixedIntervalClock(FRAMERATE);

        for(int i = 0; i < totalFrames; i++)
        {
            long timestamp = natclock.timestamp;

            Debug.LogFormat("Committing frame {0} pixels and audio", i);
            natcorder.CommitFrame(demoPixels, timestamp);
        }

        natcorder.CommitSamples(demoAudioSamples, 0); // audio starts at T=0

        Debug.LogFormat("Finishing Natcorder...");
        
        //this will trigger a hard crash
        //on Android SDK
        //Pkg.Desc=Android SDK Platform 11
        //Pkg.UserSrc=false
        //Platform.Version=11
        //Platform.CodeName=
        //Pkg.Revision=3
        //AndroidVersion.ApiLevel=30
        //Layoutlib.Api=15
        //Layoutlib.Revision=1
        //Platform.MinToolsRev=22
        //Phone: Pixel 2 XL
        //Android Vesion 11
        //Android Build number PR1A.201005.004
        //Android Studio Version 4.2.2
        //Unity Version 2020.3.4f1

        await natcorder.FinishWriting();

        Debug.LogFormat("Natcorder Finished....but am I ever reached?");
    }


    private const int VIDEO_WIDTH = 720;
    private const int VIDEO_HEIGHT = 1280;

    private const float LENGTH_SECONDS = 15f;
    private const float FRAMERATE = 30f;

    private const int AUDIO_FREQ = 44100;
    private const int AUDIO_CHANNELS = 1;
}