Update README.md

README.md

@@ -13,6 +13,8 @@ tags:
 
 A 14-Year Longitudinal Archive of Analog Drawing Process (2012–Present)
 
+**Status:** Active construction release. The canonical standardized collection is indexed and usable; pre-standard and legacy holdings remain under incremental review and ingestion.
+
 ## Overview
 
 `time-lapse-artifacts` is a longitudinal video dataset documenting analog drawing process across multiple recording periods and acquisition conditions.
@@ -25,15 +27,15 @@ The project scope is 2012–Present. This describes the span of the underlying r
 
 ### `Standard_Time_Lapses/`
 
-The canonical standardized records are the MP4 files stored directly in Standard_Time_Lapses/. The nested Provenance/ subtree contains supporting records and retained historical exceptions and is not part of the canonical record set.
+The canonical standardized records are the MP4 files stored directly in `Standard_Time_Lapses/`. The nested `Provenance/` subtree contains supporting records and retained historical exceptions and is not part of the canonical record set.
 
 Files use a structured filename convention encoding documented session information such as date, finish time when known, tools, media, support, and dimensions.
 
-metadata.csv serves as the machine-readable index for canonical records and is updated as repository ingestion and verification are completed.
+`metadata.csv` is the machine-readable index for the published canonical records.
 
 Historical source relationships should not be inferred from filenames alone.
 
-#### `Standard_Time_Lapses/Provenance/`
+### `Standard_Time_Lapses/Provenance/`
 
 Supporting records documenting the reconstruction and verification of historical source relationships.
 
@@ -76,6 +78,20 @@ Uncertain relationships are not promoted to verified relationships solely becaus
 
 Historical filenames are preserved in metadata where relevant even when the canonical filename has been standardized.
 
+The canonical metadata also includes automatically extracted technical properties such as:
+
+- playback duration
+- encoded width and height
+- orientation
+- encoded frame rate
+- video codec
+- pixel format
+- container
+- audio presence
+- repository content hash
+
+`encoded_frame_rate` describes the encoded video playback rate. It should not be interpreted as the original temporal sampling rate of the drawing process.
+
 ## Standard Acquisition Specifications
 
 **Effective: July 15, 2025**
@@ -90,7 +106,7 @@ Where no reliable finish time is available, the time remains explicitly unknown
 
 ## Canonical Status
 
-The MP4 files stored directly in Standard_Time_Lapses/ constitute the canonical standardized collection. Files within Standard_Time_Lapses/Provenance/ are supporting provenance material and are not canonical records.
+The MP4 files stored directly in `Standard_Time_Lapses/` constitute the canonical standardized collection. Files within `Standard_Time_Lapses/Provenance/` are supporting provenance material and are not canonical records.
 
 Historical source files, provenance releases, unresolved historical recordings, and pre-standard recordings are retained for documentation and comparison but are not interchangeable with canonical standardized records.