Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Natao arisiva ity resaka mitohy ity. Mametraha fanontaniana azafady raha mila fanampiana.

I cannot open files downloaded with the easy youtube downloader add-on

  • 3 valiny
  • 5 manana an'ity olana ity
  • 18 views
  • Valiny farany nomen'i andy.portman

more options

I am trying to get video clips from youtube so i can edit them together to make my own videos. using the easy youtube downloader add-on, i saved the videos to an mp4 format, after the video is downloaded, when i attempt to open it, all the player say that it is not a comptable file format (eventhough the save says .mp4) or the codec is unsupported, what can i do to support the codec, or obtain the videos in a fashion i can use them?

I am trying to get video clips from youtube so i can edit them together to make my own videos. using the easy youtube downloader add-on, i saved the videos to an mp4 format, after the video is downloaded, when i attempt to open it, all the player say that it is not a comptable file format (eventhough the save says .mp4) or the codec is unsupported, what can i do to support the codec, or obtain the videos in a fashion i can use them?

All Replies (3)

more options

Which player are you using?

A program like VLC or MPlayer is capable of playing a lot of media files.

more options

Ive tried WMP and trying to load the files in Camtasia, regardless of what player i use, i get the same message saying file format or the codec is not supported

more options

YouTube is changing its format to DASH video and audio formats. It means you cannot play them alone. You need to download both streams and then combine them together. I know https://addons.mozilla.org/en-US/firefox/addon/youtube-video-and-audio-dow/ does this automatically. Not sure about easy youtube downloader add-on.