2020-02-08: Still working great BUT... [published_date] tag has now disappeared. How to get it back?

2019-12-22: This time, it really is HOORAH! I got it working! On a whim, I clicked on the ffmpeg button in Settings (where it says "installed"). Well, it came up with another executable, so I saved it to my ffmpeg folder, and presto! Now it combines audio and video with no backtalk. Beautiful!

There are two little glitches: a) sometimes the previous video is saved, instead of the current one. I just have to remember to F5/Refresh before firing up the downloader; and b) as mentioned here somewhere, many characters are flagged as invalid and replaced with a dash. This is the case for parentheses, apostrophes, square brackets, etc. There's really no need to replace those. I'd rather have the original characters and be told by the OS that they're really and truly invalid.

*** All in all, a solid 5 stars now that everything is working. Perhaps I should be getting the three stars (or less!) for not figuring this out sooner.

2019-12-22 (earlier): Hoorah! Sort of... I updated to the latest version (0.8.9) released yesterday and I no longer get the "cannot detect url_encoded_fmt_stream..." error. I've re-installed the latest versions of native client (NodeJS) and ffmpeg, the connection says it works. HOWEVER, when comes time for combining, I now get a "something went wrong" message asking me if I'm sure native client is installed, blah, blah. I can combine manually (with ffmpeg at the cmd line) but it's a major pain, especially knowing that this should happen automagically. I'm bumping up my review to 4 stars; if I can figure out how to get it to work (or if some helpful Samaritan can point me in the right direction; anyone, please), I don't see why I wouldn't give this great add-on a 5 star rating. Here's to hoping...

Oy! I almost forgot to mention: the date_published field now works. That's fantastic! Much appreciated.

2019-12-19: Well, now it's useless. YouTube videos by the dozen are showing this error. So YouTube Video and Audio Downloader (WebEx) is of little use. As mentioned previously, Video DownloadHelper is no better, because often the only format to save to is webm; I prefer mp4. I realize this is probably a change on the YouTube side, perhaps to prevent downloads, and not a true failing of this app, but the result is the same. Is there any way around this, or might the app be updated to do so? Thanks, and sorry for the negative comments but that's the long and short of it. Thx

My previous review/comments:
2019-12-12: This was an awesome downloader until a few weeks ago, when I began getting "cannot detect url_encoded_fmt_stream_map errors on some videos. Sometimes, rarely, a refresh (F5) clears it up. Stuck using Video DownloadHelper, which is sub-par. Any chance of a fix? Thx

Working nicely after setting of nodejs and ffmpeg options, merging not always working though, requires manual intervention at times...

ACTUALLY WORKS!

One of the best Downloaders. But last few weeks there's an error on many Youtube-Videos: "Cannot detect url_encoded_fmt_stream_map or adaptive fmts".
Please fix it :)

2019-08-06 :
seems youtube changed some things… some days ago error about title, now it seems solved BUT can't find links for anything above HD resolution. And need to refresh before each download or it gets stucked to the previous link.

ten-months-ago :
Does what it says ;-)
But in settings/saving options
I can't manage to set a path for « save merged files in »
As soon as I write something there, got an error message « can't open folder ».
Letting it empty, merged files end up in « download » folder. ( Ubuntu 16-04 / 18.04 )

Unfortunately this great extension is now giving error error: info.title is undefined. Hope the developer comes with a solution soon.

Love this add-on, but seems to have a problem now:
Cannot detect url_encoded_fmt_stream_map or adaptive_fmts

version 0.8.3
Firefox 68.0.1 (64-bit)

many thanks for your efforts and the fix. however, as already mentioned here, after trying to download a new video always came another one, previously downloaded(the same one over and over, no matter the option choosed). Tried to clean cookies, buffer, but to no effect.

2019/7/30 not work now . please fix it . thx.

2019/8/2 FIXED IT THX.....

사용해보고 다음에하갯읍니다.

"info.title is undefined" Please fix it!

Ok, it's fixed now so it works with Youtube's current setup. Great plugin so I'm giving it 5 stars.

One thing that would be nice though, is if it correctly saved file names with the actual symbols in them. For example, it always turns parenthesis into dashes, so "(" and ")" always become "-". I think it also has done this with single-quote marks like the " ' " mark last time I tried it with a video that had a single-quote mark in its name. That really shouldn't happen with any of those symbols, as those are not invalid symbols in file names. So no need to replace them. In fact, the only symbols that AREN'T allowed in file names are the following:
"
%
/
\
|
:
?
*
<
>
And also, when correcting the name for a video who's title contains the double-quote marks like ", that should be corrected to the single-quote marks like ', not changed to a dash, for the filename.
So your plugin is still buggy as far as I'm concerned (and it will be, until all valid filename symbols are actually used by the plugin when saving files that contain those symbols in the video's title), so if I could, I'd give it only 4.5 out of 5 instead of a full 5 stars. But I can't select 4.5 stars, so I'm rounding up to 5 stars.

Overall great plugin, but still buggy because it turns many actually valid filename symbols into dashes, as if it thinks they aren't valid filename symbols.

Just realized something else. It doesn't copy all files to the selected download folder, only files that had to be combined. When files even don't need to be combined, they should still be copied to the selected download folder, as that's where I expect to find them. It used to do that. Your latest update seems to have broken that. So I've downgraded the rating of this plugin to only 4 stars. Fix that, either of these problems I've mentioned and your plugin will get 4.5 stars. Fix them both for a full 5 stars.

Fonctionne parfaitement. Petits bémols : les fichiers de bases ne sont pas supprimés après conversion et surtout pas de possibilité de download en un click vers un format favoris