Out of Memory Issues while Transcoding

**Describe the bug**
Cloned the react demo and modified to select videos from filesystem.

**To Reproduce**
I selected an 2mb .MOV file and received this error in the console:
```
ffmpeg-core.js:1 Pthread aborting at Error
at abort (https://unpkg.com/@ffmpeg/core@0.7.1/ffmpeg-core.js:1:17294)
at abortOnCannotGrowMemory (https://unpkg.com/@ffmpeg/core@0.7.1/ffmpeg-core.js:1:25109052)
at _emscripten_resize_heap (https://unpkg.com/@ffmpeg/core@0.7.1/ffmpeg-core.js:1:25109113)
at :wasm-function[1681]:0xf9ff8
at _e (:wasm-function[588]:0x274d7)
at :wasm-function[4855]:0x405053
at $e (:wasm-function[1682]:0xfa033)
at :wasm-function[380]:0x11346
at :wasm-function[2804]:0x202ad3
at :wasm-function[14466]:0xb781d2
```

**Desktop (please complete the following information):**
Chrome, Mac OS