Playable Video Generation
Abstract: This paper introduces the unsupervised learning problem of playable video generation (PVG). In PVG, we aim at allowing a user to control the generated video by selecting a discrete action at every time step as when playing a video game. The difficulty of the task lies both in learning semantically consistent actions and in generating realistic videos conditioned on the user input. We propose a novel framework for PVG that is trained in a self-supervised manner on a large dataset of unlabelled videos. We employ an encoder-decoder architecture where the predicted action labels act as bottleneck. The network is constrained to learn a rich action space using, as main driving loss, a reconstruction loss on the generated video. We demonstrate the effectiveness of the proposed approach on several datasets with wide environment variety.
Given a set of completely unlabeled videos, we jointly learn a set of discrete actions and a video generation model conditioned on the learned actions. At test time, the user can control the generated video on-the-fly providing action labels as if he or she was playing a videogame. We name our method CADDY. Our architecture for unsupervised playable video generation is composed by several components. An encoder E extracts frame representations from the input sequence. A temporal model estimates the successive states using a recurrent dynamics network R and an action network A which predicts the action label corresponding to the current action performed in the input sequence. Finally, a decoder D reconstructs the input frames. The model is trained using reconstruction as the main driving loss.
We recommend the use of Linux and of one or more CUDA compatible GPUs. We provide both a Conda environment and a Dockerfile to configure the required libraries.
The environment can be installed and activated with:
conda env create -f env.yml
conda activate video-generation
Use the Dockerfile to build the docker image:
docker build -t video-generation:1.0 .
Run the docker image mounting the root directory to
/video-generation in the docker container:
docker run -it --gpus all --ipc=host -v /path/to/directory/video-generation:/video-generation video-generation:1.0 /bin/bash
breakout_160_ours.tar.gz archive from Google Drive and extract it under the
The Tennis dataset is automatically acquired from Youtube by running
This requires an installation of
youtube-dl (Download). Please run
youtube-dl -U to update the utility to the latest version. The dataset will be created at
Custom datasets can be created from a user-provided folder containing plain videos. Acquired video frames are sampled at the specified resolution and framerate.
ffmpeg is used for the extraction and supports multiple input formats. By default only mp4 files are acquired.
python -m dataset.acquisition.convert_video_directory --video_directory --output_directory --target_size [--fps --video_extension --processes ]
As an example the following command transforms all mp4 videos in the
tmp/my_videos directory into a 256x256px dataset sampled at 10fps and saves it in the
python -m dataset.acquisition.convert_video_directory --video_directory tmp/my_videos --output_directory data/my_videos --target_size 256 256 --fps 10
Using Pretrained Models
Pretrained models in
.pth.tar format are available for all the datasets and can be downloaded at the following link: Google Drive
Please place each directory under the
checkpoints folder. Training and inference scripts automatically make use of the
latest.pth.tar checkpoint when present in the
checkpoints subfolder corresponding to the configuration in use.
latest.pth.tar checkpoint is present under the
checkpoints folder corresponding to the current configuration, the model can be interactively used to generate videos with the following commands:
python play.py --config configs/01_bair.yaml
python play.py configs/breakout/02_breakout.yaml
python play.py --config configs/03_tennis.yaml
A full screen window will appear and actions can be provided using number keys in the range [1,
actions_count]. Number key 0 resets the generation process.
The inference process is lightweight and can be executed even in browser as in our Live Demo.
The models can be trained with the following commands:
python train.py --config configs/
The training process generates multiple files under the
checkpoint directories a sub directory with the name corresponding to the one specified in the configuration file. In particular, the folder under the
results directory will contain an
images folder showing qualitative results obtained during training. The
checkpoints subfolder will contain regularly saved checkpoints and the
latest.pth.tar checkpoint representing the latest model parameters.
The training can be completely monitored through Weights and Biases by running before execution of the training command:
Training the model in full resolution on our datasets required the following GPU resources:
- BAIR: 4x2080Ti 44GB
- Breakout: 1x2080Ti 11GB
- Tennis: 2×2080 16GB
Lower resolution versions of the model can be trained with a single 8GB GPU.
Evaluation requires two steps. First, an evaluation dataset must be built. Second, evaluation is carried out on the evaluation dataset. To build the evaluation dataset please issue:
python build_evaluation_dataset.py --config configs/
The command creates a reconstruction of the test portion of the dataset under the
results//evaluation_dataset directory. To run evaluation issue:
python evaluate_dataset.py --config configs/evaluation/configs/
Evaluation results are saved under the
evaluation_results directory the folder specified in the configuration file with the name