Original video number should be provided when downloading the entire playlist using youtube-dl

[babygame0ver]

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I want a new functionality, which I think it will help the other users also who are using youtube-dl.
I am using youtube-dl for a year now. It's a best tool for programmer. But I want to say this from 3-4 months but I am so lazy , but Today I realized that I should suggest this feature to the newer version in the future. I was downloading a playlist with having 500 videos in it. It was downloaded successfully but there is not a number in the file name which is the biggest problem when I am downloading the entire playlist as I have to go back to YouTube, Then search back the playlist and then check which one to watch next. So please add this feature : that the number of the video should having the original number as it has on the YouTube and number shouldn't change if user start the playlist from certain point like giving the argument of --playlist-start to the tool.
Please add this feature specially when a user enter the playlist to download or ask the user to prompt whether they want to save the name with the number or not for the destination file.
Thank you

[dstftw]

Video id is in filename by default.

[babygame0ver]

Open this url https://www.youtube.com/playlist?list=PLBlnK6fEyqRjMH3mWf6kwqiTbT798eAOm ,
If you will download all the videos using youtube-dl https://www.youtube.com/playlist?list=PLBlnK6fEyqRjMH3mWf6kwqiTbT798eAOm
It will start downloading the video files. I have downloaded all the videos and now there is no id as it is not defined by the author in the videos. So It's about 200 videos and whenever I have to study I have to get back to the playlist on the YouTube and then rename them according to the number.
All videos should have naming like this original-number_video-name when it is downloaded. Think of a scenario where I don't have the internet connection and I have to see which video I have watched last. I think it is more clear now.

[dstftw]

If by number you assume incremental index of the video then read FAQ on output templates.