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Convert video array to mp4 blob
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from io import BytesIO | |
import av | |
import numpy as np | |
def video_array_to_mp4_blob(video: np.ndarray, fps: float = 24) -> bytes: | |
""" | |
Args: | |
video: Video array of shape :math:`(T, H, W, 3)` and range :math:`[0, 255]` with type ``np.uint8``. | |
fps: FPS of video | |
Returns: | |
bytes containing the encoded video as MP4/h264. | |
Examples: | |
>>> from IPython.display import HTML, display | |
>>> from base64 import b64encode | |
>>> src = 'data:video/mp4;base64,' + b64encode(video_array_to_mp4_blob(video)).decode('utf8') | |
>>> display(HTML(f'<video width="{video.shape[-2]}" height="{video.shape[-3]}" controls><source src="{src}"></video>')) | |
""" | |
f = BytesIO() | |
container = av.open(f, mode='w', format='mp4') | |
stream = container.add_stream('h264', rate=fps) | |
stream.width = video.shape[-2] | |
stream.height = video.shape[-3] | |
stream.pix_fmt = 'yuv420p' | |
for frame in video: | |
av_frame = av.VideoFrame.from_ndarray(frame, format='rgb24') | |
for packet in stream.encode(av_frame): | |
container.mux(packet) | |
for packet in stream.encode(): | |
container.mux(packet) | |
container.close() | |
return f.getvalue() |
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