docs(dex-ycb): align reader entry-point guidance and bound FFmpeg filter threads

dex-ycb/shared-v1.1/script/dexycb_v1_1/README.md

@@ -17,8 +17,9 @@ or a tool for other datasets. Unknown numerical fields/attributes fail closed.
   v1.0 tensor validator. RGB/seg/depth are not re-encoded or replaced.
 - `pilot_audit_record.py`: the exact one-off post-render audit executed for the
   recorded pilot workspace; fixed paths are intentional historical evidence.
-- `spec/`: exact supplied v1.1 documents and registry. The pilot's contract links
-  to its bundled original v1.0 semantic contract rather than a missing draft path.
+- `spec/`: exact supplied migration input documents and registry, retained for
+  provenance. `docs/CONTRACT.md` is the complete current v1.1 consumer contract;
+  readers no longer need to combine the historical v1.0 contract with a delta.
 
 Example (run under the 123 server tmux, from the existing project environment):
 

dex-ycb/shared-v1.1/script/dexycb_v1_1/read_example.py

@@ -37,7 +37,7 @@ def media_frame(view, component, index, image_size):
     if index < 0 or (profile != 'mkv/depth_float32_bits/v1' and [width, height] != [w, h]):
         raise ValueError('negative frame index or mismatched image size')
     path = resolve(view, component['data_ref'])
-    command = ['ffmpeg', '-v', 'error', '-nostdin', '-noautorotate', '-threads', '1', '-i', str(path),
+    command = ['ffmpeg', '-v', 'error', '-nostdin', '-noautorotate', '-filter_threads', '1', '-threads', '1', '-i', str(path),
                '-vf', f'select=eq(n\\,{index})', '-frames:v', '1', '-threads', '1',
                '-f', 'rawvideo', '-pix_fmt', pixel_format, 'pipe:1']
     result = subprocess.run(command, check=True, capture_output=True)