FrameBridge: Improving Image-to-Video Generation with Bridge Models

1. Fine-tuning from CogVideoX

Environment Setup

cd framebridge-cogvideox

conda create -n framebridge-cogvideox python=3.10
conda activate framebridge-cogvideox
pip install -r requirements.txt

Fine-tuning from CogVideoX-2B

(1) Prepare the Initialization Model

First download the CogVideoX-2B model. For our I2V fine-tuning, we slightly modify the transformer of CogVideoX (doubling the number of input channels for the input layer to receive image input). You can directly download our modified version CogVideoX-2B-modified.

(2) Prepare WebVid-2M Dataset

Download the metadata file results_2M_train.csv of WebVid-2M and put all videos in the folder 2M_train with the following structure:

2M_train/
├── 00001.mp4
├── 00002.mp4
|   ......
└── *****.mp4

(3) Run the Fine-tuning Script

Modify the following path arguments in finetune_single_rank_i2v_bridge_2b.sh:

• MODEL_PATH: path to CogVideoX-2B-modified
• DATASET_PATH: path to results_2M_train.csv
• --video_folder: path to 2M_train

Run the script:

bash finetune_single_rank_i2v_bridge_2b.sh

Inference with Fine-tuned Model

The fine-tuned FrameBridge-CogVideoX model can be downloaded from the Google Drive link. (Unfortunately, due to limited computational resources and dataset quality, the performance of FrameBridge model is not as satisfactory as the official I2V version of CogVideoX.)

Before running inference, update the following arguments in sample.sh:

• --model_path: path to the original CogVideoX-2B model or CogVideoX-2B-modified (either option is ok as the transformer will be reloaded with the fine-tuned bridge model)
• --image_or_video_path: path to the image prompt
• --transformer_path: path to the FrameBridge-CogVideoX model (or the transformer subfolder from fine-tuned models)

Run the script:

bash sample.sh

2. Training from Scratch on UCF-101

Environment Setup

cd framebridge-latte

conda create -n framebridge-latte python=3.9
cconda activate framebridge-latte
pip install torch==2.1.0 torchvision==0.16.0 torchaudio==2.1.0 --index-url https://download.pytorch.org/whl/cu118
pip install -r requirements.txt

Training

(1) Prepare UCF-101 Dataset and VAE Model

Download UCF-101 dataset.

Download VAE model stabilityai/sd-vae-ft-ema and put the files into the folder checkpoints/vae.

(2) Set Path Arguments in Config Files

We have three different config files for training different models:

• configs/ucf101/ucf101_train_bridge.yaml: training vanilla FrameBridge
• configs/ucf101/ucf101_train_nwarp.yaml: training the neural prior model
• configs/ucf101/ucf101_train_bridge_nwarp.yaml: training FrameBridge with neural prior

Choose the corresponding config file based on the model you want to train, and set the path arguments inside:

• data_path: path to the extracted UCF101 folder
• pretrained_model_path: path to the checkpoints folder which include the downloaded VAE.

If you want to train FrameBridge with neural prior, you also need to set:

• nwarp_config: path to configs/ucf101/ucf101_sample_nwarp.yaml
• nwarp_ckpt: path to checkpoint of trained neural prior model

(3) Run the Script

# Train vanilla FrameBridge
bash train_scripts/ucf101_bridge_train.sh

# Train neural prior model
bash train_scripts/ucf101_nwarp_train.sh

# Train FrameBridge with neural prior
bash train_scripts/ucf101_bridge_nwarp_train.sh

Inference

(1) Set Path Arguments

You can download FrameBridge checkpoints from the Google Drive link:

• FrameBridge trained without neural prior
• Neural prior model
• FrameBridge trained with neural prior

There are also different config files for sampling with different models:

• configs/ucf101/ucf101_sample_bridge.yaml: sampling with vanilla FrameBridge
• configs/ucf101/ucf101_sample_bridge_nwarp.yaml: sampling with FrameBridge with neural prior

Similarly,

• set pretrained_model_path to the path of the checkpoints folder containing the VAE
• set data_path to the UCF-101 folder (the UCF-101 dataset is needed to obtain image prompts during sampling).

To use FrameBridge with neural prior, you also need to set:

• nwarp_config: path to configs/ucf101/ucf101_sample_nwarp.yaml
• nwarp_ckpt: path to checkpoint of trained neural prior model

in the config file configs/ucf101/ucf101_sample_bridge_nwarp.yaml.

(2) Run the Script

Set --ckpt arguments in the corresponding script with downloaded or trained checkpoint, and run the script:

# vanilla FrameBridge
bash sample/ucf101_bridge.sh

# FrameBridge with neural prior
bash sample/ucf101_bridge_neural_prior.sh

Acknowledgements

This repository is built upon the excellent work of CogVideoX, cogvideox-factory, Latte, and DynamiCrafter. We sincerely thank the authors and contributors of these projects.