> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/QwenLM/Qwen3-VL/llms.txt
> Use this file to discover all available pages before exploring further.

# Video Understanding

> Video OCR, long video understanding, and video grounding

# Video Understanding

Qwen3-VL delivers exceptional video understanding capabilities, including improved video OCR, long video comprehension, and temporal grounding. The model can process hours of video content with full recall and second-level indexing.

## Capabilities

### Video OCR

* **Text Extraction**: Read text appearing in video frames
* **Subtitle Recognition**: Extract and transcribe on-screen text
* **Motion Tolerance**: Handle moving cameras and text
* **Multi-language**: OCR support for 32 languages in video

### Long Video Understanding

* **Extended Context**: Native 256K context, expandable to 1M tokens
* **Full Recall**: Remember details from hours of video
* **Second-level Indexing**: Locate specific moments precisely
* **Temporal Coherence**: Track events and changes across time

### Video Grounding

* **Temporal Localization**: Find when events occur in video
* **Object Tracking**: Follow objects across frames
* **Event Detection**: Identify specific actions and occurrences
* **Timestamp Generation**: Provide precise time markers

## How It Works

### Interleaved-MRoPE Architecture

Qwen3-VL uses Interleaved-MRoPE (Multi-Resolution Rope) for video understanding:

* **Full-frequency Allocation**: Optimized positional embeddings for time, width, and height
* **Long-horizon Reasoning**: Enhanced capability for extended video sequences
* **Temporal Modeling**: Better understanding of events over time

### Text-Timestamp Alignment

The model features precise timestamp-grounded event localization:

* Move beyond traditional temporal RoPE
* Link descriptions to exact video moments
* Enable frame-accurate temporal queries

## Use Cases

### Content Analysis

* **Video Summarization**: Generate summaries of long videos
* **Highlight Detection**: Find key moments automatically
* **Content Moderation**: Analyze video content for compliance
* **Sports Analysis**: Track plays, scores, and events

### Accessibility

* **Video Captioning**: Generate descriptions for video content
* **Subtitle Generation**: Create accurate transcriptions
* **Audio Description**: Describe visual elements for accessibility

### Media & Entertainment

* **Content Indexing**: Make videos searchable by content
* **Scene Detection**: Identify and catalog different scenes
* **Character Tracking**: Follow characters throughout videos
* **Event Timeline**: Build timelines of video events

### Security & Surveillance

* **Activity Recognition**: Detect specific actions and behaviors
* **Anomaly Detection**: Identify unusual events
* **Object Tracking**: Follow people and objects over time

## Try It Out

Explore video understanding with our interactive cookbook:

> **[Video Understanding Cookbook](https://github.com/QwenLM/Qwen3-VL/blob/main/cookbooks/video_understanding.ipynb)**
>
> Better video OCR, long video understanding, and video grounding.

[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/QwenLM/Qwen3-VL/blob/main/cookbooks/video_understanding.ipynb)

## Key Features

* **Long Context**: Process hours of video content
* **Frame Sampling Control**: Adjust FPS and frame selection
* **Temporal Grounding**: Locate events with second-level precision
* **Multi-modal Integration**: Combine visual and text understanding

## Technical Capabilities

### Video Processing

* Support for various video formats (MP4, AVI, etc.)
* URL and local file support
* Configurable frame sampling (FPS control)
* Batch processing for multiple videos

### Advanced Features

* **Video QA**: Answer questions about video content
* **Video Captioning**: Generate descriptions for video clips
* **Action Recognition**: Identify actions and activities
* **Scene Understanding**: Comprehend complex video scenes

## Related Capabilities

* [OCR](https://mintlify.com/QwenLM/Qwen3-VL/capabilities/ocr.md) - Text extraction in video frames
* [2D Grounding](https://mintlify.com/QwenLM/Qwen3-VL/capabilities/grounding-2d.md) - Object localization in frames
* [Spatial Understanding](https://mintlify.com/QwenLM/Qwen3-VL/capabilities/spatial-understanding.md) - Understand spatial dynamics in video


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