FFmpeg choking on trimming

[alexarje]

For some videos, I get a 2 frames left in the queue on closing error when specifying start and end time. Looking around, this seems to be a well-known issue that can be solved by adding -max_muxing_queue_size 9999.

[joachimpoutaraud]

I have updated the extract_subclip function and added -max_muxing_queue_size 9999 to the FFmpeg command. This should fix the issue.