為了改善您的使用體驗,本網站正在進行維護,部分功能暫時無法使用。若本站的文件無法解決您的問題,想要向社群發問的話,請到 Twitter 上的 @FirefoxSupport 或 Reddit 上的 /r/firefox 發問,我們的社群成員將很快會回覆您的疑問。

搜尋 Mozilla 技術支援網站

防止技術支援詐騙。我們絕對不會要求您撥打電話或發送簡訊,或是提供個人資訊。請用「回報濫用」功能回報可疑的行為。

了解更多

No h.264 playback on youtube

more options

When I try to enable html5 playback on youtube for most firefox browser. I find that h.264 playback is not allowed. Consequently I don't think I can play in 2x. I thought firefox natively adopted h.264 already. Am I mistaken?

When I try to enable html5 playback on youtube for most firefox browser. I find that h.264 playback is not allowed. Consequently I don't think I can play in 2x. I thought firefox natively adopted h.264 already. Am I mistaken?

被選擇的解決方法

Do you have the codecs installed to play H.264 (MP4) videos?

On Windows XP you need to have the media.directshow.enabled set to true on the about:config page.

從原來的回覆中察看解決方案 👍 2

所有回覆 (3)

more options

選擇的解決方法

Do you have the codecs installed to play H.264 (MP4) videos?

On Windows XP you need to have the media.directshow.enabled set to true on the about:config page.

more options

thanks. for whatever reason the problem resolved spontaneously. if i didn't have the codecs to play h.264 (mp4) videos would I have to install them manually? (i have some other computers that have this problem). Where would I get them? are they codecs for firefox or windows as a whole?

more options

out of curiosity i'm on a different computer running windows 7 and i have the same problem. i don't even see the option to enable the line you mentioned in about:config. How do i install the appropriate codecs?