omni-removal/VOR-Train-MASK-Fix

VOR-Train MASK Temporal Alignment Fix

This repository is a replacement patch for temporally misaligned MASK videos in the Blender subset of VOR-Train. It contains MASK videos only; it does not redistribute BG or FG_BG videos.

What was wrong

The affected source MASK sequences contain 240 semantic frames, but most were encoded as 30 fps / 8 seconds while the corresponding RGB videos are 24 fps / 10 seconds. A later conversion treated the 30 fps timestamps as real time, retained about 192 frames at 24 fps, and looped content to reach 240 frames. This caused a growing 0.8x temporal drift and a characteristic repeat around frame 192.

The repaired videos preserve all 240 source frames in their original order and reinterpret the timeline as 24 fps / 10 seconds. They are not repaired by dropping frames or by changing the displayed frame-rate metadata alone.

Contents

• MASK/: 7,866 replacement MASK videos.
• replacement_manifest.csv: all 7,877 scene-scoped candidates, including the 7,866 included files and 11 excluded clips.

Every included video is H.264, 1920x1080, yuv420p, 24 fps, 240 frames, 10 seconds, and has no audio stream. Match and replace files by their unchanged clip filename.

Excluded clips

Six clips are excluded because the upstream source MASK contains fewer than 240 frames. Creating a 240-frame replacement would require fabricated looping, duplication, or interpolation:

clip_id	upstream frames
BLENDER_BEDROOM005_00208	43
BLENDER_BEDROOM009_00190	186
BLENDER_CON001_00090	145
BLENDER_FACTORY001_01207	49
BLENDER_FACTORY002_00305	37
BLENDER_FOREST039_00344	79

Five additional repaired clips are excluded conservatively because comparison with the independent abs(FG_BG - BG) signal suggested a possible inherited constant offset. These candidates are separate from the repaired 0.8x drift/192-frame-loop defect and require source-image or frame-index review:

clip_id	candidate offset (frames)
BLENDER_RIVER004_00064	-6
BLENDER_RIVER004_00072	-6
BLENDER_STREET006_00002	-19
BLENDER_STREET006_00027	-4
BLENDER_STREET006_00030	-4

Applying the patch

Download this repository, verify replacement_manifest.csv, and copy the contents of MASK/ over the corresponding VOR-Train MASK/ directory by filename. Keep a backup of the original MASK videos. The 11 excluded filenames are intentionally not present and must not be synthesized.

Validation

The 7,866 published replacements are drawn from a larger 7,871-video repair output that passed full decoding and frame-order/content checks. The original 192-frame-loop signature was absent from all repaired outputs. SHA-256 values and exact byte sizes for the published files are provided in replacement_manifest.csv.

License and attribution

This repository is a repair patch and does not grant a new standalone license for the underlying VOR-Train content. Access, use, and redistribution remain subject to the original VOR dataset license and terms. Please cite the original VOR dataset and its authors when using this patch.

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VOR-Train MASK 时序对齐修复补丁

本仓库仅提供 VOR-Train Blender 子集内时序错位 MASK 视频的替换补丁，不包含或重新发布 BG、FG_BG 视频。

问题与修复

受影响的上游 MASK 序列具有240个语义帧，但多数被封装为30 fps、8秒；对应RGB视频为24 fps、10秒。后续转换错误地按时间重采样，仅保留约192帧内容，再循环补到240帧，造成逐渐增大的0.8倍时序漂移和约192帧处的回绕。

本补丁保留上游240帧的内容与顺序，将时间轴正确解释为24 fps、10秒；没有通过丢帧、循环补帧或仅修改播放器显示帧率来“修复”。

内容和使用

• MASK/：7,866条可直接按同名文件替换的MASK视频。
• replacement_manifest.csv：记录全部7,877条场景级候选，包括7,866条已上传视频和11条排除记录。

所有已上传视频均为H.264、1920x1080、yuv420p、24 fps、240帧、10秒且无音频。下载后请先核对CSV和SHA-256，再将MASK/中的同名文件覆盖到VOR-Train的MASK/目录，并提前备份原文件。

6条上游源不足240帧、5条仍可能存在继承自上游的固定偏移，因此对应视频不会上传，也不得通过循环、复制或插值伪造。完整名单及原因见上文和CSV。

许可与引用

本仓库是修复补丁，不为底层VOR-Train内容授予新的独立许可。访问、使用及再分发仍须遵守原VOR数据集许可与使用条款；使用本补丁时请引用原VOR数据集及其作者。