.tempfile files not removed if there is a transcoding error

[yondonfu]

Describe the bug
A clear and concise description of what the bug is.

.tempfile files may not be removed if an error is encountered before transcoding completes. This can result in an orchestrator's data directory filling up with .tempfile files over time.

The file is removed here, but that line may not be reached if an error occurs before then.

[anshgoyalevil]

@yondonfu Is this issue still valid? If yes, I would love to work on it.