> I tried to play it on VLC media player but it said > but it was a bit long so I thought I'd watch it later by taking the file from my Firefox cache. > I watched some of this video on this website Was it raw format when it says undf format?

I wonder if its the saving to webm from the webpage that makes it playable from the cache too?

VLC player does indeed play it from the cache now! Having gone to the webpage again and watched some of the video again but not letting it finish downloading then saving it as a webm file elsewhere then Using VideoCacheView again to look in the cache again its appeared as a 20MB webm file. It was a 70MB file in my cache yesterday but in unplayable undf format. Other videos I fail to play with VLC from the cache say nothing with no time length. I do come across undf format every now and then, so it would have been good to play undf videos at times. Said 'try media player classic, better than vlc imo anyway plus it can use all sorts of codecs' I had Googled it earlier and this webpage VLC TRY IT FREE TRY IT FREE 1.> You should have just googled for 'undf'. Step 5 Right-click on the file and select open with MPC-HC, now the video file should be played smoothly. Step 4 After that rerun the file in VLC, the UNDF file should be running in VLC properly without any error. Step 3 Install the Combined Community Codec Pack and do the needful, as seen in the screenshots. Step 2 Download Combined Community Codec Pack that provides a complete list of all the essential audio or video codec required to play the media file format. If it doesn't work, continue the steps below. Step 1 Go to the official website to get the latest version of VLC, which usually rectifies the error shown in the previous versions. To do it, you need to install all the required audio and video codes on the system to make sure they can support all the file formats efficiently on the network. The following are the detailed steps for fixing 'VLC does not support UNDF Format' issue. How to Fix VLC Does Not Support UNDF Format In that case, there're steps below that need your attention to fix UNDF error in the VLC player. Don't lose heart after seeing the above screenshot a situation cannot be that worse if you are sure the video file is good.

Undf video codec