How to Adjust FFmpeg Deshake Search Range

This article explains how to adjust the motion detection search range in the FFmpeg deshake video stabilization filter. You will learn which parameters control the search radius and search methodology, along with practical command-line examples to optimize your video stabilization process.

The FFmpeg deshake filter works by comparing blocks of pixels between frames to estimate camera motion. To adjust how far the filter looks to detect this shaking, you need to configure the search range parameters: rx and ry.

Key Parameters for Search Range

• rx: Sets the maximum horizontal search range in pixels. The value can range from 0 to 64, with a default of 16.
• ry: Sets the maximum vertical search range in pixels. The value can range from 0 to 64, with a default of 16.
• search: Determines the search strategy. Setting this to 0 enables an exhaustive search (highly accurate but slower), while setting it to 1 uses a less exhaustive, faster search algorithm (large diamond search).

Practical Command Examples

To adjust these settings, pass the parameters directly to the deshake filter in your FFmpeg command.

1. Increasing the Search Range for Heavy Shaking

If your video has significant, wide-angle camera shakes, you should increase the search range to the maximum value of 64 pixels:

ffmpeg -i input.mp4 -vf "deshake=rx=64:ry=64" output.mp4

2. Decreasing the Search Range for Micro-vibrations

For high-frequency, small-amplitude vibrations (like drone footage or tripod vibrations), decrease the search range to save processing power and prevent false motion detection:

ffmpeg -i input.mp4 -vf "deshake=rx=8:ry=8" output.mp4

3. Optimizing for Accuracy with Exhaustive Search

To combine a larger search range with the most accurate detection method, set the search parameter to 0 (exhaustive search):

ffmpeg -i input.mp4 -vf "deshake=rx=32:ry=32:search=0" output.mp4

Tips for Best Results

• Keep aspect ratio in mind: If your video has mostly horizontal shake (panning), you can set a higher rx and a lower ry to optimize processing speed.
• Performance trade-off: Higher values for rx and ry require more CPU processing power. If processing time is an issue, keep the values as close to the default of 16 as your footage allows.