Fluent-ffmpeg - Make the stream argument for the pipe function optional
Fluent-ffmpeg - Make the stream argument for the pipe function optional

- Per fluent-ffmpeg documentation: (https://github.com/fluent-ffmpeg/node-fluent-ffmpeg#pipestream-options-pipe-the-output-to-a-writable-stream) - “When no stream argument is present, the pipe() method returns a PassThrough stream, which you can pipe to somewhere else (or just listen to events on).”
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