Download all videos from DeepMind's Kinetics dataset. Moreover, you can use this library to extract frames and sound track from videos, generate metadata for training and pack all sound tracks into a single tfrecords file for faster reading.
- Python >= 3.4
- youtube-dl
- ffmpeg
- gzip
Required Python packages are listed in requirements.txt.
WARNING: Before you start any download from YouTube, please be sure, that you have checked YouTube Terms Of Service and you are compliant. Especially check section 5.H.
Download all videos:
python download.py --all
Download specific classes:
python download.py --classes 'pole vault' 'blowing glass'
List all classes:
python list_classes.py
Download specific categories:
Categories are defined as described in [1]. However, 14 classes were not present in any category, therefore, I added them under the category "custom".
python download.py --categories 'arts and crafts' cooking
List all categories and classes that belong to them:
python list_categories.py
Extract frames from videos:
Extracting frames from the video files is useful because loading mp4 files during training is time-consuming. Additionally, current Neural Networks are usually training on a small subset of video frames from each video making it wasteful to load the whole video.
python videos_to_frames.py --all
The script uses VideoCapture from the OpenCV library. If you installed the library
using pip install opencv-python it will not work because video-related functionality
is not supported in this build (see this stackoverflow question).
You will need to build OpenCV with video-related functionality enabled to use this script.
Extract sound tracks from videos:
python videos_to_sound.py --all
Create metadata:
Although it would be ideal to have the whole dataset available, a fraction of videos has been delete from YouTube since Kinetics was released. Furthermore, not all videos contain a sound track and frame extraction might fail for some videos. For this reason, it is convenient to generate metadata that keep track of all successfully downloaded videos.
You can generate metadata for videos (.mp4 files), video frames or sound tracks. You will need to generate metadata for sound tracks if you want to pack them into a tfrecords file (see below).
Generate metadata for videos:
python create_meta.py videos --sets 400 --save resources/kinetics_videos
Generate metadata for video frames:
python create_meta.py frames --sets 400 --save resources/kinetics_video_frames
Generate metadata for sound tracks:
python create_meta.py sound --sets 400 --save resources/kinetics_sound
The --sets switch dictates how many classes will be included in the metadata.
Example use case: we want to select the hyper-parameters of our neural networks on a small subset
of Kinetics (let's say 50 from the 400 classes) and then train the neural network on the whole
dataset. Therefore, we will call python create_meta.py frames --sets 50 400 --save resources/kinetics_video_frames
to generate metadata for 50 randomly chosen classes and for all 400 classes.
Convert sound tracks into a tfrecords file:
Loading mp3 files in Tensorflow (as of version 1.3.0) creates a severe bottleneck for the training speed. It is convenient to pack all mp3 files into a single tfrecords file and load the tfrecords file during training.
Example:
python sound_to_tfrecords.py train resources/kinetics_sound_400_train.json resources/kinetics_sound_400_classes.json dataset/kinetics_400_train_sound.tfrecords
Note:
First, you will need to generate metadata for sound tracks.
Other scripts:
Download statistics (e.g. fraction of videos downloaded):
python download_stats.py
Video statistics (e.g. histogram of video resolutions):
python video_stats.py
The training and validation videos are downloaded into their individual directories. Furthermore, a directory is created for each class.
Example:
dataset/train/blowing_glass
dataset/valid/blowing_glass
Test videos are all downloaded into a single directory because their classes are not known.
Example:
dataset/test
The videos are all download in mp4. If a video isn't available in mp4, it's downloaded in the next best format and converted into mp4. All videos are downloaded with sound.
Videos' file names correspond to their YouTube IDs. All spaces in directory names are replaced with underscores (e.g. blowing glass => blowing_glass).
The sound to tfrecords script is based on this tutorial.
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