ffmpeg shows little usage of a large number of threads

[humdinger]

Please refer to the forum thread ​ffmpeg's threads/cpu usage.

While ffmpeg under Linux shows a similarly large number of threads, it has a combined cpu usage of around 70%, while Haiku is at a max of 50%. Overall speed reported by ffmpeg for a test encoding is around 13x under Linux, 9.5x under Haiku.

As waddlesplash said:

This looks like a job for scheduling_recorder and DebugAnalyzer to determine where the bottlenecks are, if it doesn't appear I/O is the problem. Probably worth opening a ticket, as this looks like something that could be "low-hanging fruit" performance-wise.