mkv to mp4 conversion fails after some time

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FFmpeg.SetExecutablesPath(@"..\bin\Debug\net5.0", "FFmpeg");

await FFmpegDownloader.GetLatestVersion(FFmpegVersion.Official);

var snippet = await FFmpeg.Conversions.FromSnippet.Convert(input, output, true);

await snippet.Start();

• I have a movie that is about 2 1/2 hours long that is mkv file type. I'm trying to convert to mp4. I've tried with multiple large mkv files, from 0.5 - 2 1/2 hours.
• It seems to run fine but then crashes around 80-87mb mark.
• When opening the file, it can't render.
• The file inputs are fine and I believe FFmpeg downloads correctly. I've obscured the file paths due to security risks.

Error log below. FFmpeg_error_mkv_to_mp4.txt