Reports

extensions_dict = {
    "mp4": {"type": "video", "codec": ["libx264", "libmpeg4", "aac"]},
    "mkv": {"type": "video", "codec": ["libx264", "libmpeg4", "aac"]},
    "ogv": {"type": "video", "codec": ["libtheora"]},
    "webm": {"type": "video", "codec": ["libvpx"]},
    "avi": {"type": "video"},
    "mov": {"type": "video", "codec": ["libx264", "prores"]},
    "ogg": {"type": "audio", "codec": ["libvorbis"]},
    "mp3": {"type": "audio", "codec": ["libmp3lame"]},
    "wav": {"type": "audio", "codec": ["pcm_s16le", "pcm_s24le", "pcm_s32le"]},
    "m4a": {"type": "audio", "codec": ["libfdk_aac"]},
    "flac": {"type": "audio", "codec": ["flac"]},
}

There is no "hevc_nvenc" codec in moviepy source code. How are you even using it.

Check it yourself -
https://github.com/Zulko/moviepy/blob/master/moviepy/tools.py
https://github.com/Zulko/moviepy/blob/master/moviepy/video/VideoClip.py

if should raise a key error.

if codec is None:
            try:
                codec = extensions_dict[ext]["codec"][0]
            except KeyError:
                raise ValueError(
                    "MoviePy couldn't find the codec associated "
                    "with the filename. Provide the 'codec' "
                    "parameter in write_videofile."
                )

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