Guard against some race conditions. Update osc to upstream.#54

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blankname wants to merge 7 commits intoTheAMM:masterfrom

Commits on Mar 4, 2020

Don't try to update_state when duration is nil in the on_video_change event.
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Don't try to update thumbnail progress before Thumbnailer.state has been initialized.
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Have workers guard against a nil duration before starting work. This seems to happen when a worker is assigned a job and between this assignment and the worker starting to do the job the video ends.
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Ensure that thumbnail files exist before trying to add them to the overlay.
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Guard against nil video-dec-params before trying to access video dimensions.
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Commits on Mar 7, 2020

Handle nil duration in get_thumbnail_count.
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update patched_osc.lua to upstream 7e2bb7b
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