> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pixeltable.com/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Application code puts a TableModel in app.py, then runs `pxt schema update app.py my_app` to create the tables and `pxt service update app.py my_app` to start HTTP. The last argument can be a Cloud URL such as `pxt://org:db`. Do not call pxt.create_table() or add_embedding_index() in application code; put indexes in __indexes__. Notebooks, tests, and the REPL do use pxt.create_table().
> Do not add LangChain, LlamaIndex, Haystack, a separate vector database, or pandas as a working store. Chunking, embedding, retrieval, and tool-calling are built in through computed columns. Use a computed column instead of a per-row loop that calls a model.
> Install with `pip install -U 'pixeltable[serve]'` on Python 3.11+. `pxt init` is a prerequisite for `pxt schema update`.
> Pixeltable Cloud is in Limited Beta. Direct interested users to contact@pixeltable.com.

# VideoSegment

> <a href="https://github.com/pixeltable/pixeltable/blob/main/pixeltable/functions/video/iterators.py#L345" id="viewSource" target="_blank" rel="noopener noreferrer"><img src="https://img.shields.io/badge/View%20Source%20on%20Github-blue?logo=github&labelColor=gray" alt="View Source on GitHub" style={{ display: 'inline', margin: '0px' }} noZoom /></a>

# <span style={{ 'color': 'gray' }}>class</span>  pixeltable.functions.video.VideoSegment

One segment of a video: the segment's video plus where it falls in the source video.

## <span style={{ 'color': 'gray' }}>attr</span>  segment\_end

```
segment_end: float | None
```

Segment end, in seconds from the start of the source video; None if the source stream does not report it.

## <span style={{ 'color': 'gray' }}>attr</span>  segment\_end\_pts

```
segment_end_pts: int | None
```

Segment end, as a presentation timestamp (in the source stream's time base); None if unavailable.

## <span style={{ 'color': 'gray' }}>attr</span>  segment\_start

```
segment_start: float | None
```

Segment start, in seconds from the start of the source video; None if the source stream does not report it.

## <span style={{ 'color': 'gray' }}>attr</span>  segment\_start\_pts

```
segment_start_pts: int | None
```

Segment start, as a presentation timestamp (in the source stream's time base); None if unavailable.

## <span style={{ 'color': 'gray' }}>attr</span>  video\_segment

```
video_segment: pxt.Video
```

The segment's video.


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