Incorrect size being sent to ffmpeg

[jdelman]

Trying to save a short clip of a resized video. I explicitly resize the video clip here:

height = 400 
width = 532
clip = master_video.resize(width=width, height=height).subclip(start, end)

But ffmpeg was throwing an error that the width was not divisible by 2. Getting ffmpeg_video_writer to print out the ffmpeg command confirmed that an incorrect command is being sent to ffmpeg:

[MoviePy] Writing video /volumes/sigma/151.mp4
attempting to write video with the following command:
ffmpeg -y -loglevel error -f rawvideo -vcodec rawvideo -s 533x400 -pix_fmt rgb24 -r 59.94 -i - -an -i 151TEMP_MPY_wvf_snd.m4a -acodec copy -vcodec libx264 -preset medium -pix_fmt yuv420p /volumes/sigma/151.mp4

If I explicitly set the size, why is it being sent wrong to ffmpeg?

[Zulko]

What you want to write is:

clip = master_video.resize(newsize=(532, 400))

Or even simpler:

clip = master_video.resize((532, 400))

As explained in the docstring (but maybe I need to clarify or throw an error), height and width should not be used together, but alone, to preserve automatically the aspect ratio:

clip.resize(width=532) # the height will be automatically computed
clip.resize(height=400) # width will be automatically computed 

Note that this sometimes makes clips with uneven sizes, which some formats (like yours) don't like. In this case you can use the effect even_size which will automatically remove the last line or column of pixel to make the dimensions even:

# import moviepy.editor as mpy ...
clip = master_video.resize(height=400).fx( mpy.vfx.even_size)

[jdelman]

Thanks! That did the trick.