settb, asettb

Set the timebase to use for the output frames timestamps. It is mainly useful for testing timebase configuration.

It accepts the following parameters:

'expr, tb'

The expression which is evaluated into the output timebase.

The value for 'tb' is an arithmetic expression representing a rational. The expression can contain the constants "AVTB" (the default timebase), "intb" (the input timebase) and "sr" (the sample rate, audio only). Default value is "intb".

Command line examples

• Set the timebase to 1/25:

  settb=expr=1/25
  

• Set the timebase to 1/10:

  settb=expr=0.1
  

• Set the timebase to 1001/1000:

  settb=1+0.001
  

• Set the timebase to 2*intb:

  settb=2*intb
  

• Set the default timebase value:

  settb=AVTB