The single exception type KiteFFmpeg throws for FFmpeg-related failures. Inspect error for the semantic category and code for the raw AVERROR_* value.
AVERROR_*
The raw AVERROR_* code, or 0 for internal errors.
The semantic category of the failure.
The error lines FFmpeg logged on the failing call's thread while it ran, oldest first (#170).
The error's message, which ends with the lines in logged once they are attached.