Vidsz: Video's Wizard

Common Wrapper/Interface around various video reading/writing tools to make video reading stable, consistent and super easy around different systems and OS.

pip install vidsz

Backends

• OpenCV (in-development)

Features

• Easy and hassle free (read/write with for-loop, with-block, while-loop)
• Batch Support. Read and write frames in batches.

Read Video

Read with for-loop

from vidsz.opencv import Reader

# open reader
reader = Reader("static/countdown.mp4")

# read frame with for loop
for frame in reader:
    # use ndarry-frame however you like
    pass

# release
reader.release()

Read with a with-block

with Reader("static/countdown.mp4") as reader:
    frame = reader.read()

Read with a while-loop

# this follows similar behavior as opencv counterpart
while reader.is_open():
    # returns ndarry-frame or None if nothing left to read
    frame = reader.read()
    if frame is None:
        break

Read frames in a batch

with Reader("dummy.mp4", batch_size=8, dynamic_batch=True) as reader:
    batch_frames = reader.read()

Get properties of the reader

# print info: width, height, fps etc.
print(reader)

# access specific things
print(reader.width, reader.height, reader.fps)

# access number-of-frames/seconds/minutes that have been read
print(reader.frame_count, reader.seconds, reader.minutes)

Write Video

Write a single frame

from vidsz.opencv import Reader, Writer

video_fname = "static/countdown.mp4"

# open reader
reader = Reader(video_fname)

# start writer with the Reader object
# by default it'll append _out in the name of the output video
writer = Writer(reader)

# start writer with your settings;
# you can also give any combinations of
# following settings with Reader object to
# overwrite default settings
writer = Writer(name="out.mp4", width=1920, height=1080, fps=15)

# print writer info
print(writer)

# write single frame
frame = reader.read()
writer.write(frame)

Write with for-loop

# read frame with for loop
for frame in reader:
    # write the ndarry-frame
    writer.write(frame)

Write a batch

# read batches and write
with Reader("dummy.mp4", batch_size=8, dynamic_batch=True) as reader:
    batch_frames = reader.read()
    # write list or ndarray of frames
    writer.write_all(batch_frames)

# close off
reader.release()
writer.release()

Write with a with-block

# using "with" block, write "static/countdown_out.mp4" (clone of input)
with Reader(video_fname) as reader:
    with Writer(reader, name="out_with.mp4") as writer:
        writer.write_all(reader)

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