Early return will cause `call` to be destroyed outside the worker thread, which gives confusing error messages when all you did was type the wrong path to the input file :) Bug: webrtc:14508 Change-Id: I029910d8da4bc7b08dafd02cb5ebf88d9c7afa59 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/277443 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Philip Eliasson <philipel@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38254}