Thanks for the great library and the corresponding documentation!

However, a new user which wants to do video editing and manipulation could ask: what are the advantages of using movis over the moviepy, which is a much older library with many releases already?

https://github.com/Zulko/moviepy

Maybe we could add a small section in the README and provide some overview over the video editing space available in Python ...

Code:

import movis as mv

scene = mv.layer.Composition(size=(1080, 1900), duration=4.0)
scene.write_video("output.webm")

Output:

[webm @ 0x6e9a600] Only VP8 or VP9 or AV1 video and Vorbis or Opus audio and WebVTT subtitles are supported for WebM.
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 -- 
  1%|█▎       

Is this my version of ffmpeg or...? I'm not sure how to solve this.

Hello!
First of all i love this package and its really great work & super fast. Just one question since I could not find documentation on how to properly resize layers.
I found a workaround like the following:

image = mv.layer.Image(media_path, duration=duration)
scale_factor = helper.scale_to_cover(
    target_size=self.scene_size, current_size=image.size
)
scene = mv.layer.Composition(size=self.scene_size, duration=duration)
scene.add_layer(image, scale=scale_factor)


def scale_to_cover(target_size, current_size):
    tw, th = target_size
    cw, ch = current_size
    width_ratio = tw / cw
    height_ratio = th / ch
    return max(width_ratio, height_ratio)

But wouldn't it be more convenient having a function like ‘concatenate’ or ‘crop’, so we don't have to create a second layer?

layer = mv.layer.Video(r'D:\video\2\07.mp4')
scene = mv.trim(layer, start_times=[0.0, 2.0], end_times=[1.0, 3.0])
scene.write_video('06.mp4')

C:\Users\17632\AppData\Roaming\Python\Python310\site-packages\movis\layer\media.py:358: FutureWarning: PySoundFile failed. Trying audioread instead.
Audioread support is deprecated in librosa 0.10.0 and will be removed in version 1.0.
duration = librosa.get_duration(path=str(self._audio_file))
C:\Users\17632\AppData\Roaming\Python\Python310\site-packages\movis\layer\media.py:336: UserWarning: PySoundFile failed. Trying audioread instead.
audio, _ = librosa.load(str(self._audio_file), sr=AUDIO_SAMPLING_RATE, mono=False)
C:\Users\17632\AppData\Roaming\Python\Python310\site-packages\librosa\core\audio.py:183: FutureWarning: librosa.core.audio.__audioread_load
Deprecated as of librosa version 0.10.0.
It will be removed in librosa version 1.0.
y, sr_native = __audioread_load(path, offset, duration, dtype)
0%| | 0/60 [00:00<?, ?it/s]C:\Users\17632\AppData\Local\Temp\tmpy2kbmd1a.wav: Permission denied
2%|▏ | 1/60 [00:00<00:07, 7.83it/s]
Traceback (most recent call last):
File "C:\Users\17632\AppData\Roaming\Python\Python310\site-packages\imageio_ffmpeg_io.py", line 630, in write_frames
p.stdin.write(bb)
OSError: [Errno 22] Invalid argument

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "D:\ttdxg\Python\editvideo\test.py", line 61, in
scene.write_video('06.mp4')
File "C:\Users\17632\AppData\Roaming\Python\Python310\site-packages\movis\layer\composition.py", line 479, in write_video
self._write_video(start_time, end_time, fps, writer)
File "C:\Users\17632\AppData\Roaming\Python\Python310\site-packages\movis\layer\composition.py", line 410, in _write_video
writer.append_data(frame)
File "C:\Users\17632\AppData\Roaming\Python\Python310\site-packages\imageio\core\format.py", line 590, in append_data
return self._append_data(im, total_meta)
File "C:\Users\17632\AppData\Roaming\Python\Python310\site-packages\imageio\plugins\ffmpeg.py", line 600, in _append_data
self._write_gen.send(im)
File "C:\Users\17632\AppData\Roaming\Python\Python310\site-packages\imageio_ffmpeg_io.py", line 637, in write_frames
raise IOError(msg)
OSError: [Errno 22] Invalid argument

FFMPEG COMMAND:
C:\Users\17632\AppData\Roaming\Python\Python310\site-packages\imageio_ffmpeg\binaries\ffmpeg-win64-v4.2.2.exe -y -f rawvideo -vcodec rawvideo -s 1920x1080 -pix_fmt rgba -r 30.00 -i - -i C:\Users\17632\AppData\Local\Temp\tmpy2kbmd1a.wav -vcodec libx264 -pix_fmt yuv420p -v error -map 0:v:0 -map 1:a:0 D:\ttdxg\Python\editvideo\06.mp4

FFMPEG STDERR OUTPUT:

Dear @rezoo , it might not give you a lot of money, but please enable for you to accept donation. I am using your library and would love to donate.

is movis support rtsp like imageio-ffmpeg and opencv ?

best regards

Related to #25

Current example

import movis as mv

video = mv.layer.Video('foo.mp4')
scene = mv.fade_in_out(video, fade_in_duration=5.0, fade_out_duration=5.0, fade_audio=True)

We will consider the detailed specifications later.

How to add transition animations, such as fading in and out, when video stitching