Refine README and rename unpack script

README.md

@@ -23,7 +23,7 @@ benchmark_splits/
   test_nonexpert_unseen/video_progress_benchmark_file.json
 
 scripts/
-  extract_vlac2_release_raw_archives.sh
+  unpack_data.sh
   extract_vlac2_release_frames.py
 
 data/
@@ -36,15 +36,15 @@ data/
 ### 1. Unpack the video archives
 
 ```bash
-bash scripts/extract_vlac2_release_raw_archives.sh
+bash scripts/unpack_data.sh
 ```
 
-This command extracts `data/train_videos.tar` and `data/test_videos.tar` into `data/`, while preserving the relative directory structure expected by the benchmark release.
+This command extracts `data/train_videos.tar` and `data/test_videos.tar` into `data/`.
 
 To extract the raw videos elsewhere, pass a target directory:
 
 ```bash
-bash scripts/extract_vlac2_release_raw_archives.sh /path/to/data
+bash scripts/unpack_data.sh /path/to/data
 ```
 
 ### 2. Extract frames
@@ -55,25 +55,11 @@ python scripts/extract_vlac2_release_frames.py \
   --frames-root /path/to/data_extracted_frames
 ```
 
-This command reads raw videos from `/path/to/data` and writes extracted frames to `/path/to/data_extracted_frames`. Only the benchmark-designated main camera stream is materialized.
-
-For example, if the raw videos are unpacked to:
-
-```text
-/path/to/release/data
-```
-
-then the extracted frames will be written to:
-
-```text
-/path/to/release/data_extracted_frames
-```
-
-If `--frames-root` is omitted, frames are written to `_extracted_frames/` under the release directory by default.
+This command extracts the benchmark main-view frames from `/path/to/data` into `/path/to/data_extracted_frames`. If `--frames-root` is omitted, frames are written to `_extracted_frames/` under the release directory.
 
 ### 3. Use the benchmark splits
 
-The benchmark JSON files are pre-generated and can be used directly. No benchmark reconstruction is required.
+The benchmark JSON files are pre-generated and can be used directly.
 
 Frame paths in the JSON files use the prefix:
 
@@ -81,25 +67,7 @@ Frame paths in the JSON files use the prefix:
 __VLAC2_FRAMES_ROOT__/
 ```
 
-Replace `__VLAC2_FRAMES_ROOT__` with the absolute path to the extracted-frame directory produced by the frame-extraction step.
-
-For example, if frames are extracted to:
-
-```text
-/path/to/release/data_extracted_frames
-```
-
-then:
-
-```text
-__VLAC2_FRAMES_ROOT__/...
-```
-
-should be resolved as:
-
-```text
-/path/to/release/data_extracted_frames/...
-```
+Replace `__VLAC2_FRAMES_ROOT__` with the absolute path to the extracted-frame directory. For example, `__VLAC2_FRAMES_ROOT__/...` should be resolved as `/path/to/data_extracted_frames/...`.
 
 ## Notes