https://github.com/materight/pyav-cuda

Extension of PyAV (ffmpeg bindings) with hardware decoding support. Compatible with PyTorch and Nvidia codecs.
https://github.com/materight/pyav-cuda

cuda cuvid ffmpeg libav pytorch

Last synced: 3 months ago
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Extension of PyAV (ffmpeg bindings) with hardware decoding support. Compatible with PyTorch and Nvidia codecs.

• Host: GitHub
• URL: https://github.com/materight/pyav-cuda
• Owner: materight
• License: mit
• Created: 2024-07-15T13:44:50.000Z (6 months ago)
• Default Branch: main
• Last Pushed: 2024-09-10T17:06:31.000Z (5 months ago)
• Last Synced: 2024-09-30T18:42:49.452Z (4 months ago)
• Topics: cuda, cuvid, ffmpeg, libav, pytorch
• Language: Python
• Homepage:
• Size: 55.7 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# PyAV-CUDA

[![PyPI version](https://img.shields.io/pypi/v/avcuda)](https://pypi.org/project/avcuda/)

**PyAV-CUDA** is an extension of [PyAV](https://github.com/PyAV-Org/PyAV) that adds support for hardware-accelerated video decoding using Nvidia GPUs. It integrates with FFmpeg and PyTorch, providing CUDA-accelerated kernels for efficient color space conversion.

## Installation

1. Build and install FFmpeg with [hardware acceleration support](https://pytorch.org/audio/stable/build.ffmpeg.html).

2. To enable hardware acceleration in PyAV, it needs to be reinstalled from source. Assuming FFmpeg is installed in `/opt/ffmpeg`, run:

    ```bash

    pip uninstall av

    PKG_CONFIG_LIBDIR="/opt/ffmpeg/lib/pkgconfig" pip install av --no-binary av --no-cache

    ```

    If the installation was successful, `h264_cuvid` should appear between the available codecs:

    ```python

    import av

    print(av.codecs_available)

    ```

3. Install PyAV-CUDA:

    ```bash

    PKG_CONFIG_LIBDIR="/opt/ffmpeg/lib/pkgconfig" CUDA_HOME="/usr/local/cuda" pip install avcuda

    ```

4. Test the installation by running `python examples/benchmark.py`. The output should show something like:

    ```

    Running CPU decoding... took 34.99s

    Running GPU decoding... took 8.30s

    ```

## Usage

To use hardware decoding, instantiate an `HWDeviceContext` and attach it to a `VideoStream`. Note that an `HWDeviceContext` can be shared by multiple `VideoStream` instances to save memory.

```python

import av

import avcuda

CUDA_DEVICE = 0

with (

    av.open("video.mp4") as container,

    avcuda.HWDeviceContext(CUDA_DEVICE) as hwdevice_ctx,

):

        stream = container.streams.video[0]

        hwdevice_ctx.attach(stream.codec_context)

        # Convert frames into RGB PyTorch tensors on the same device

        for frame in container.decode(stream):

            frame_tensor = hwdevice_ctx.to_tensor(frame)

```