Extract audio/video parts from a HAR file

extract_har_audio.py

import sys
import base64
import json

def main(path):
    with open(path, 'rt') as fh:
        j = json.load(fh)

    for entry in j['log']['entries']:
        if not 200 <= entry['response']['status'] < 300:
            continue
        content = entry['response']['content']
        mime = content['mimeType']
        print(entry['request']['url'], mime)
        if mime.startswith('video/') or mime.startswith('audio/'):
            yield content

if __name__ == '__main__':
    for i,c in enumerate(main(sys.argv[-1])):
        assert c['encoding'] == 'base64', c['encoding']
        content = base64.b64decode(c['text'])
        with open('%05d.bin' % i, 'wb') as fh:
            fh.write(content)