extract_frames

Function decode_frames_dropping

Source 
pub(crate) fn decode_frames_dropping(
    frame_prefix: &str,
    video_path: impl AsRef<Path>,
    frames_path: impl AsRef<Path>,
) -> Result<()>
Expand description

Decodes video frames by dropping frames according to FRAMES_BETWEEN_EXTRACTED constant.

This function implements the basic frame extraction method that processes videos sequentially. It’s memory-efficient and works well for smaller videos or single-core processing. The FRAMES_BETWEEN_EXTRACTED constant determines which frames are extracted (e.g., every 30th frame for 30fps video = 1fps output).

§Arguments

  • frame_prefix - String prefix for output PNG filenames (e.g., “segment-1” creates “segment-1_0.png”)
  • video_path - Source video file to decode
  • frames_path - Directory where PNG frame images will be saved

§Performance Notes

  • Frames are processed in decode order without seeking (faster)
  • Memory usage scales with FRAMES_BETWEEN_EXTRACTED value (lower = more memory)
  • Single-threaded operation unless called within parallel context