[Doc][Misc] Update DreamID-Omni Example; Add DreamID-Omni post process function (#2809)

Signed-off-by: yuanheng <jonathan.zhaoyh@gmail.com>

docs/user_guide/examples/offline_inference/x_to_video_audio.md

@@ -31,9 +31,9 @@ dreamid_omni/
 ```
 
 ### Run the Inference
-```
+```python
 python x_to_video_audio.py \
-  --model /xx/dreamid_omni \
+  --model /path/to/dreamid_omni \
   --prompt "Two people walking together and singing happily" \
   --image-path ./example0.png ./example1.png \
   --audio-path ./example0.wav ./example1.wav \
@@ -43,11 +43,33 @@ python x_to_video_audio.py \
   --num-inference-steps 45 \
   --height 704 \
   --width 1280 \
-  --output dreamid_omni.mp4
+  --output out_dreamid_omni_twoip.mp4
 ```
 In the current test scenario (2 images + 2 audio inputs), the VRAM requirement is 72GB, regardless of whether cfg-parallel is enabled or disabled.
 The VRAM usage can be reduced by enabling CPU offload via --enable-cpu-offload.
 
+
+You could take reference images/audios from the test cases in the official repo: https://github.com/Guoxu1233/DreamID-Omni
+
+For example, single IP ref resources can be found under https://github.com/Guoxu1233/DreamID-Omni/tree/main/test_case/oneip, you could download them correspondingly to your local and use them for testing.
+
+```python
+# Example usage for oneip, ref media from the official repo DreamID-Omni
+python x_to_video_audio.py \
+  --model /path/to/dreamid_omni \
+  --prompt "<img1>: In the frame, a woman with black long hair is identified as <sub1>.\n**Overall Environment/Scene**: A lively open-kitchen café at night; stove flames flare, steam rises, and warm pendant lights swing slightly as staff move behind her. The shot is an upper-body close-up.\n**Main Characters/Subjects Appearance**: <sub1> is a young woman with thick dark wavy hair and a side part. She wears a fitted black top under a light apron, a thin gold chain necklace, and small stud earrings.\n**Main Characters/Subjects Actions**: <sub1> tastes the sauce with a spoon, then turns her face toward the camera while still holding the spoon, her expression shifting from focused to conflicted.\n<sub1> maintains eye contact, swallows as if choosing her words, and says, <S>I keep telling myself I’m fine,but some nights it feels like I’m just performing calm.<E>" \
+  --image-path 9.png \
+  --audio-path 9.wav \
+  --video-negative-prompt "jitter, bad hands, blur, distortion" \
+  --audio-negative-prompt "robotic, muffled, echo, distorted" \
+  --cfg-parallel-size 2 \
+  --num-inference-steps 45 \
+  --height 704 \
+  --width 1280 \
+  --output out_dreamid_omni_oneip.mp4
+```
+
+
 Key arguments:
 - `--prompt`: text description (string).
 - `--model`: path to the model local directory.