Known bugs:

1. Video formats suck
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One would expect video formats to allow for a wide range of tags. Things like
writer, director, main actors, original author, etc. But most of them only
provide ONE tag: title...
Planned workaround: tag guessing (see TODO).

2. Random hang
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Something I encountered and don't understand: sometimes, seemingly randomly,
the call to wait, to retrieve the exit status of a worker, does not return,
though the worker *has* exited. This happens rarely, but it will probably hit
you if you have more than 20.000 tasks to run. When this happens, just hit
Control-C and re-run AtOM to resume transcoding.

Symptoms:
- Progress does not update anymore
- a pstree only show one child process: sqlite3
- strace()ing shows the script process stuck on waitpid()

Please let me know if this hits you, or if you have any idea as to why this is
happening and how to avoid it.

3. Premature temp file removal
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Sometimes, a temporary file gets deleted while one or more task(s) still needs
it. Ensuing failure is correctly handled and the failed files will be generated
during the next batch.