I have used this add on for quite some time with no issues and great results....until today. When I open the download panel is just states file size and UndefinedK. What does that mean and how do I fix it?

Great inteface. Easy to use. Uses the library for download progress.

There is an error when combining audio and video files: "cannot find the file". Ffmpeg and software are installed correctly.

May 11 2020, it's working again!
Jan 12 2022, stopped working. Went back to earlier version, but now it doesn't combine files.
Dec 2022, not combining files. Looking for something else. March 23, no longer combines audio and video.

This is a great add-on. I have used it for years to extract videos for my prison ministry. However, like Devilshaker, it has stopped working for me. I also uninstalled and then reinstalled the add-on. This worked that last time I encountered the cannot detect url_encoded_fmt_stream_map... but not this time. Perhaps the developer has not yet fixed the current version for this occurance of the problem. I hope it gets fixed soon.

not bad seems to get the job done.

26 April 2020: since a few days (21 april update) the programm gives me -cannot detect url_encoded_fmt_stream_map or adaptive fmts.
I've deleted the add-on and re-installed it, but the problem is still here.

muy util para descargar videos y audios de youtube exelente

fast download,just perfect!

nice addon!!

First downloader to actually work & let me download YT videos as MP3s through a built-in converter.

UPDATE! Now it still has errors everytime I try & merge audio/video, & when it succeeds, the file is only 22 seconds long! WTF is the point in THAT?! SMDH! Fix this shit already, please, would you?

It won't combine both the video & audio for vids DL'd via YT, & I have the latest FFMpeg installed too! & it is all config'd properly but yet will NOT combine both when DL'ing, & when I try & combine them afterwards in Media Muxer & Converter, it gives an error msg everytime I try & add the audio file to the video combiner. This addon USED to work just fine, flawlessly, even. Now it won't do what it's intended to do! & I recently formatted my SSD, & reinstalled EVERYTHING, so, very doubtful of any corruption. & I have a very good Internet Security suite installed & config'd properly too. So, WTF is the problem?