[Galaxy 3 Q&A, Help & Troubleshooting] Dannyves:
I'm pretty much having the same issues. I've downloaded many different apps to help with downloading because I love downloading everything to have copies since YouTube, Dailymotion and others are constantly deleting videos. These following strategies have worked for all the videos I've attempted to download and is specific to x-flv and xvid flash videos.

Here's some of my tricks:

It's important to find a browser or a downloading app that will play the video contained in the url link,

1 = download Firefox browser (download flash downloader plug-in) - a major issue with Firefox I've come across is that it is extremely picky with viewings of flv/flash vids especially x-flv and xvid. The browser is the only one I've come across that downloads videos from websites.

If you download "puffin browser" it pretty much allows you to view 99.9 %percent of the videos on the Internet but it has no add-ons, if there was only a way of downloading videos using puffin browser it would be perfect.

2. I have all the following downloading apps and usually one works- any one of them will most likely at least play the video in the url, if it doesn't allow you to download the file but it does play the file then I suggest allowing the entire video to play and after you've let the entire video to play close out of the app, reopen it, copy and paste the url, try re-downloading the video, if it still doesn't work copy and paste the url in all the following Android apps I've listed below to see if any of them will download the file, if it still doesn't work go to step 3.....:

NOTE :I suggest having all these apps on your Android if you're an avid (flash) video downloader becaus you

Simply go through each app copy and pasting the url, each app has their strength and weakness.

AVD - haven't been able to use this one a lot because there's been licensing issues with it recently but it's powerful

APT video Downloader - this one is a newer app also very powerful, good for the harder to get videos but it's still 50/50

Badoink - I used to use this one all the time before I figured out I could just use flash downloader plug-in in Firefox, it basically works the same way just a separate app in fact Firefox is better because this one doesn't like loading flash videos.

Video downloader pro - believe it or not, this one ends up downloading most the vids the other more expensive ones refuse to download.

Video getter - this one's basically a knock off of "video downloader pro" but I find it more updated, I switch between the two a lot because sometimes one is pickier than the other depending on the video

Media Catcher - another strong app for the hard to get videos but it's more 50/50

Download all video flv - this one has proven completely useless to me despite it specifically specializing in flash videos, maybe I don't know how to use it but it hasn't downloaded not even one of the many urls I've pasted on there, maybe you'd have more luck with it. This app you can only find in "blackmarket" and be careful because there's another ripoff version of it that looks identical but it's adware.

Easy downloader pro - this one sometimes downloads the harder to get videos

Easy video downloader - this one is web-based, if there's a share video button related to the video "easy video downloader" shows up 'sometimes', but it's 50/50,I've never really needed to use it too much.

IDM (Internet downloader manager) - another very powerful app.

Web video downloader - this one I recently got, haven't used it much but it seems really good.

NOTE : some of these apps you have to pay for but you can download them for free using either "blackmarket" or as a torrent on pirate Bay or kickasstorrents.

3- I think the key here is you must find a downloading app that at least plays your (flv, x-flv or xvid) video and allow that app to entirely play your video. Once that video has played close out of the app and go to either IDM (Internet downloader manager) or Firefox browser, copy and paste the url, play the video (hopefully it now plays in either app) and now you should be able to download the video. Again the key is to at least be able to play that video entirely in any downloading Android app, if it's able to entirely play it should download, if it doesn't play in either of the apps try step 4.

4- try pasting the link on this website, it's a video downloader web-based :

"clip converter"

Hopefully one of these methods works for you :)