How to get filename of file downloaded with Youtube-dl

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I am using youtube-dl with a flask app to download a file and return the file. When I download the filename is changed slightly from the video title. Looking through the source code I thought I found it with the function encodeFilename in utils.py. However, this is still not a match and I can't return the file.

How could I get the filename, or alternatively change the filename that is downloaded?

This is my code at the moment:

def preferredencoding():
    try:
        pref = locale.getpreferredencoding()
        'TEST'.encode(pref)
    except Exception:
        pref = 'UTF-8'

    return pref


def get_subprocess_encoding():
    if sys.platform == 'win32' and sys.getwindowsversion()[0] >= 5:
        encoding = preferredencoding()
    else:
        encoding = sys.getfilesystemencoding()
    if encoding is None:
        encoding = 'utf-8'
    return encoding


@app.route('/api/v1/videos', methods=['GET'])
def api_id():
    if 'link' in request.args:
        link = request.args['link']
        print("Getting YouTube video")
        try:
            title = youtube_dl.YoutubeDL().extract_info(link, download=False)["title"]
            print(title.encode(get_subprocess_encoding(), 'ignore'))
            print(title)
            code=link.split('v=')[1]
            youtube_dl.YoutubeDL().download([link])
            return send_from_directory(r'C:\Users\User123', title+'-'+code+'.mp4')
        except:
            return "<h1>Error</h1>
youtube-dl python
1 Answers
class FilenameCollectorPP(youtube_dl.postprocessor.common.PostProcessor):
    def __init__(self):
        super(FilenameCollectorPP, self).__init__(None)
        self.filenames = []

    def run(self, information):
        self.filenames.append(information['filepath'])
        return [], information
    
filename_collector = FilenameCollectorPP()

my_youtube_dl = youtube_dl.YoutubeDL()
my_youtube_dl.add_post_processor(filename_collector)

# do some downloading, then look inside filename_collector.filenames

Inspired by https://github.com/ytdl-org/youtube-dl/issues/27192#issuecomment-738004623

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