Fix get_batch hang - use int64_t for NDArray PTS - #341
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从 dmlc/decord open issues/PR 筛选并本地验证后移植： - NDArray.pts int->int64_t（dmlc#269/dmlc#341）；SkipFramesImpl 用 Drained() 判真 EOF，避免容器虚标帧数时死循环并采样 EOF 幽灵帧（dmlc#373/dmlc#342） - CheckKeyFrame EOF 出口 + GetFrameCount avg_frame_rate.den==0 防除零（dmlc#230） - FFmpeg 7 buffersink pix_fmts 类型变化守卫（libavfilter>=10，PR dmlc#368），新增 Windows FFmpeg 7.1 CI job - 帧索引缓存版本混入 LIBAVFORMAT_VERSION_INT，防止跨 FFmpeg 构建误用旧缓存（本地实测 7.1/8.1 时间戳不一致） - ctypes 默认 RTLD_LOCAL + DECORD_RTLD_GLOBAL 逃生开关，PATH 缺失兜底（dmlc#361/dmlc#362/dmlc#357） - _init_internal_api 显式 import _api_internal（PR dmlc#364）；AVReader sample_rate 默认值与文档对齐为 -1（PR dmlc#237） - VideoReader.close()/上下文管理器（dmlc#222）；GPU VP8 映射（dmlc#217）；worker 停止后的 Push 可读报错（dmlc#321） - 新增回归：large_pts.mp4 大 PTS get_batch/seek、close/context manager、PATH 缺失、RTLD_GLOBAL 开关、AVReader 默认值 - 本地验证：Windows GPU FFmpeg 8.1 61 tests、CPU FFmpeg 8.1 60 tests、CPU FFmpeg 7.1 60 tests 全绿
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#269
When videos have very large PTS (>INTMAX), cur_frames do not match what is actually read from video, leading to the frame queue being empty, and SkipFramesImpl goes into an infinite loop