flatlinebb

Keyboard Control
LEFT and RIGHT
Seek backward/forward 5 seconds. Shift+arrow does a 1 second exact seek (see --hr-seek).
UP and DOWN
Seek forward/backward 1 minute. Shift+arrow does a 5 second exact seek (see  --hr-seek).
Ctrl+LEFT and Ctrl+RIGHT
Seek to the previous/next subtitle. Subject to some restrictions and might not always work; see  sub-seek command.
Ctrl+Shift+Left and Ctrl+Shift+Right
Adjust subtitle delay so that the next or previous subtitle is displayed now. This is especially useful to sync subtitles to audio.
[ and ]

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD