settb - FFmpeg 2.0.7 / Sources / Multimedia

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

This filter accepts the following options:

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".

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
```