Lead-ins and Lead-outs

What are lead-ins and lead-outs?

• These are the spaces in time between the text appearing on-screen and the audio becoming audible.
• Lead-ins are the time when the subtitle shows up before the talent speaks.
• Lead-outs are the time the subtitles disappear after the talent speaks.
• This is used to get the viewer to sync up the subtitles with the audio by compensating for the time it takes for the brain to process both sight and hearing.

Standard lead-in	at least 150ms
Standard lead-out	at least 300ms

• These are the absolute minimum values. 
• You can add more if it looks better.

If the next line is less than around 500ms (including  lead-ins and lead-outs), snap the current line to the next line.
- This means the end of the current time is the start of the next one.