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Gradient Mechanics

Benchmarks

HuggingFace Image Dataset

uv run python src/tests/benchmark_huggingface_images.py

Video Dataset

uv run python src/tests/benchmark_video_dataset.py data/humming_bird_1s.mp4

Transcoding

Keyframes Only

ffmpeg -i data/humming_bird_1s.mp4 -c:v libx264 -x264-params keyint=1:scenecut=0 -crf 18 data/humming_bird_1s_keyframes_only.mp4

Inspect Encoding

ffprobe -loglevel error -select_streams v:0 -show_entries frame=pict_type -of default=noprint_wrappers=1 data/humming_bird_1s_keyframes_only.mp4

Terminology:

  • I-frame is a key frame. Decoding a keyframe is not dependent on other frames.
  • P-frame is a predicted frame. It is dependent on an preceding frame.
  • B-frame is a bi-directional predicted frame. It depends on a preceding and a succeeding frame.

Metadata

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