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ltx2_4k_experiments/reports/ltx2_repro_4k_three_stage_4096x2304_report.md
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# LTX-2 复现实验报告
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- 生成时间:2026-05-21 07:06:58
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- Conda 环境:`ltx2_repro`
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- 仓库路径:`/lustre/fs11/portfolios/nvr/projects/nvr_elm_llm/users/shyang/ltx2`
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- 输出目录:`/lustre/fs11/portfolios/nvr/projects/nvr_elm_llm/users/shyang/ltx2/outputs/ltx2_repro_4k_three_stage_4096x2304`
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- 基准设置:`4096x2304`,`121` 帧,`24` FPS,非蒸馏 pipeline 使用 `30` denoise steps。
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- 默认运行精度/卸载:核心非 LoRA pipeline 使用 `fp8-cast` / `none`;LoRA 相关 pipeline 使用 `none` / `cpu`,避免当前 GPU 架构上的 FP8 LoRA fusion 不兼容。
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## 涉及模型
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- `full_checkpoint`:`models/ltx2/LTX-2.3/ltx-2.3-22b-dev.safetensors`(存在)
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- `distilled_checkpoint`:`models/ltx2/LTX-2.3/ltx-2.3-22b-distilled-1.1.safetensors`(存在)
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- `distilled_lora`:`models/ltx2/LTX-2.3/ltx-2.3-22b-distilled-lora-384-1.1.safetensors`(存在)
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- `spatial_upsampler`:`models/ltx2/LTX-2.3/ltx-2.3-spatial-upscaler-x2-1.1.safetensors`(存在)
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- `gemma_root`:`models/ltx2/gemma-3-12b-it-qat-q4_0-unquantized`(存在)
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- `lipdub_lora`:`models/ltx2/LTX-2.3-22b-IC-LoRA-LipDub/ltx-2.3-22b-ic-lora-lipdub-0.9.safetensors`(缺失)
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- `hdr_lora_glob`:`models/ltx2/LTX-2.3-22b-IC-LoRA-HDR/*hdr*.safetensors`(缺失)
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- `hdr_text_embeddings_glob`:`models/ltx2/LTX-2.3-22b-IC-LoRA-HDR/*emb*.safetensors`(缺失)
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## 排除项
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按用户要求,camera/style/pose/motion 等控制相关 LoRA 不复现。本次将以下控制 LoRA pipeline 作为排除项:
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- `ic_lora`
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## Pipeline 结果
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### TI2VidThreeStagesPipeline
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- Pipeline:`ti2vid_three_stages_4k`
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- 具体流程:三阶段 T2V/I2V:1/4 分辨率生成,连续两次 spatial upsampler + distilled LoRA 精修到 4K 级目标分辨率。
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- 控制信号:文本 prompt。
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- 成功数量:1/8
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- 平均单视频总时间:838.80 s
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- 平均纯 DiT 时间:620.63 s
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- 平均纯 DiT FPS:0.19 frames/s
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| Stage | 分辨率 | denoise steps | loop | 平均 DiT 时间(s) | 平均 DiT FPS |
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|---|---:|---:|---|---:|---:|
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| `stage_1_generate` | `1024x576` | `30` | `euler_denoising_loop` | 248.29 | 0.49 |
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| `stage_2_refine` | `2048x1152` | `3` | `euler_denoising_loop` | 35.97 | 3.36 |
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| `stage_3_refine` | `4096x2304` | `3` | `euler_denoising_loop` | 336.36 | 0.36 |
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| # | 状态 | output video path | 实际视频元数据 | 单视频总时间(s) | 纯 DiT 时间(s) | 纯 DiT FPS | 控制信号摘要 |
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|---:|---|---|---|---:|---:|---:|---|
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| 0 | success | `outputs/ltx2_repro_4k_three_stage_4096x2304/ti2vid_three_stages_4k/ti2vid_three_stages_4k_00.mp4` | 4096x2304, 24.00 FPS, 121 frames | 838.80 | 620.63 | 0.19 | prompt=A close-up tabletop shot of a glass marble rolling across a brushed metal surface, tiny reflections shifting as it passes under soft studio lights. |
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