Rename file after download using API

[samhagin]

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I'm currently using youtube-dl API in a python script to download videos, how can I rename the video after it has been downloaded? I'm using the output format in the code below

ydl_opts = { 'cookiefile': cleaned_file, 'force_generic_extractor': True , 'outtmpl':   '%(autonumber)s-%(title)s.%(ext)s', 'restrictfilenames': True , 'sleep_interval': 30 }

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        ydl.download( urls  )

and this gives filenames such as 0001-Linux-Academy.mp4, i will prefer to rather name this 0001-Getting-started-with-Linux.mp4 ( where the Getting-started-part is actually retrieved by selenium from the webpage the video is on ). Is there a way to modify the output template to have a custom name returned from a function or use exec option which is part of the CLI to do some post renaming after the download?

Btw, the full source code I'm using is at https://github.com/samhagin/linuxacademy-dl/blob/master/download.py

Thanks

[dstftw]

https://github.com/rg3/youtube-dl/blob/c3bcd206eb031de30179c88ac7acd806a477ceae/youtube_dl/__init__.py#L300-L304

[samhagin]

Thanks for the answer @dstftw but I'm not sure how to call this within ydl_opts. Can you please provide some sample code? thanks again

[samhagin]

ok so figured it out, i could do something like this to rename a file after download. is there a way to use a python function in place of mv or any bash hacks, or better still is there a way to create a custom output template?

ydl_opts = {
    'postprocessors': [{
         'key': 'ExecAfterDownload',
         'exec_cmd': 'mv -v {} this_file.mp4'
     }]
}