base64 decode as save as multiple files

I have a file(har file saved from web developer" that contains the base64 encoded value of multiple video*.ts files. I am interested to decode the base64 part and save as multiple ts files if the request url is a .ts file and the response encoding should be base64. "request": { "bodySize": 0, "method": "GET", "url": "https://vz-73062248-092.b-cdn.net/856d96e6-97e6-4c3d-82b8-a53a8a411513/1920x1080/video1.ts ", ...... ..... .... "response":{ ..... ..... "content": { "mimeType": "video/mp2t", "size": 882472, "encoding": "base64", "text": "R................=="}, ----->should be decoded from this string as video1.ts ..... The above should be saved as video1.ts , decoded from the base64 string between "text": ", till " There are multiple entries for the ts files from 1 till 350 in the file. The file is around 500MB Please please let me know hoe can i save as multiple ts files from the base64 decoded string from the file?