scripts/encoder-parameters.py

#!/usr/bin/env cached-nix-shell
#!nix-shell -i python3 -p python3
import sys
import subprocess
import json


def is_number(value):
    numeric_chars = [*map(str, range(10)), "-"]
    numeric_charcodes = list(map(ord, numeric_chars))

    return all(ord(char) in numeric_charcodes for char in value)


def parse_encoder_params(encoder_params):
    for param in encoder_params.split(" / "):
        if "=" in param:
            key, value = param.split("=", 1)

            if is_number(value):
                value = int(value)
            elif is_number(value.replace(".", "", 1)):
                value = float(value)
        else:
            key = param
            value = True

        yield key, value


def run_mediainfo(file):
    cmd = [
        "mediainfo",
        "--Inform=Video;%Encoded_Library%\\n%Encoded_Library_Settings%",
        file,
    ]
    process = subprocess.run(cmd, stdout=subprocess.PIPE)
    output = process.stdout.decode("utf-8").split("\n")

    encoder = output[0]
    params = dict(parse_encoder_params(output[1]))

    return {"file": file, "encoder": encoder, "params": params}


info = list(map(run_mediainfo, sys.argv[1:]))
print(json.dumps(info, indent=2, sort_keys=True))