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# SampleInterval

Analysis tasks usually do not process every frame of a video.

This parameter specifies the minimum interval between frames that are selected to be analyzed. For example, if you set `SampleInterval=125ms` then any two frames analyzed by the task will be separated by at least 125 milliseconds. This means that at most eight frames are analyzed for every second of video.

If the parameter IngestRate is set to `0`, the interval between the frames selected for analysis will be as close as possible to `SampleInterval`.

If the parameter IngestRate is set to `1`, the interval between the frames selected for analysis will also be as close as possible to `SampleInterval`. However, if the analysis task cannot process frames at this rate, it will increase the sample interval. For example, if you set `SampleInterval=125ms` but the task is not able to analyze eight frames per second, it increases the sample interval and processes fewer frames than you requested.

In most cases Micro Focus recommends that you use the default value of `SampleInterval`. If you have set `IngestRate=1` and a task significantly increases the sample interval, or if you have set `IngestRate=0` and processing takes a long time, it might be due to the server having insufficient resources.

NOTE:

When the input for the analysis task is provided by another analysis task, the `SampleInterval` parameter is ignored. Media Server attempts to analyze all of the input frames. If this is not possible, for example due to the server having insufficient resources, Media Server increases the sample interval of the first analysis task.

Type: | Time duration The value of this parameter is a time duration. Specify the duration in the following format:
         1days 2hours 3minutes 4seconds 500milliseconds 600microseconds
You can omit any of the individual durations when they are not required:
         4seconds 500milliseconds
You can also shorten the string by abbreviating the units to their first letter (milliseconds abbreviates to ms, microseconds to us):
         4s 500ms
The following are all equivalent:
         1minute 3seconds
         1m 3s
         63s
To specify an infinite duration, use the value `Infinite`.
Default: | 66ms
Required: | No
Configuration Section: | TaskName
Example: | `SampleInterval=125ms`
See Also: | IngestRate NumParallel

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