Update README.md

README.md

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 # AVSpeech Video + Audio
 
-This dataset stores AVSpeech media as separate columns:
+A restructured subset of the [AVSpeech](https://looking-to-listen.github.io/avspeech/) dataset with separated media streams and derived identifiers.
+
+- `clip_id`: unique identifier per clip, derived as `{youtube_id}_{start:.3f}_{end:.3f}` from the original AVSpeech CSV columns.
+- `avspeech_metadata`: JSON string with the original AVSpeech row fields (`youtube_id`, `start_sec`, `end_sec`, `x_center`, `y_center`).
 - `video`: video-only stream (no audio), stream-copied without re-encoding.
 - `audio`: audio-only stream, stream-copied without re-encoding.
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+  
 ## Citation
 
 If you use this dataset, please cite the original AVSpeech paper: