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# GXF extensions
See the User Guide for details regarding the extensions in GXF and Holoscan SDK, and for instructions to build your own extensions
- `aja`: support AJA capture card as source. It offers support for GPUDirect-RDMA on Quadro GPUs. The output is a VideoBuffer object.
- `custom_lstm_inference`: provide LSTM (Long-Short Term Memory) stateful inference module using TensorRT
- `format_converter`: provide common video or tensor operations in inference pipelines to change datatypes, resize images, reorder channels, and normalize and scale values.
- `opengl`: OpenGL Renderer(visualizer) to display a VideoBuffer, leveraging OpenGL/CUDA interop.
- `probe`: print tensor information
- `segmentation_postprocessor`: segmentation model postprocessing converting inference output to highest-probability class index, including support for sigmoid, softmax, and activations.
- `segmentation_visualizer`: OpenGL renderer that combines segmentation output overlayed on video input, using CUDA/OpenGL interop.
- `stream_playback`: provide video stream playback module to output video frames as a Tensor object.
- `tensor_rt` _(duplicate from GXF)_: Run inference with TensorRT
- `v4l2`: Video for Linux 2 source supporting USB cameras and other media inputs. The output is a VideoBuffer object.
- `visualizer_tool_tracking`: custom visualizer component that handles compositing, blending, and visualization of tool labels, tips, and masks given the output tensors of the custom_lstm_inference