90038da2987b8cc13fc268ea8cb9d158cf2e6f93
OpenCV FFMPEG build buffer (CAP_PROP_BUFFERSIZE=1) on file sources was landing mid-file, so the first decoded frame could show an ~11s-later camera clock than the source's true frame 0. Gate BUFFERSIZE to live sources only and seek file sources to CAP_PROP_POS_FRAMES=0. Log pos_frames/pos_msec/frame_count/fps once on first successful read. SPEC: B1, V18, T20. AGENTS: capture setup notes.
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