Most of youtube videos play sound but no video?

[kronos]

Please help me in this! Most youtube videos play sound but no videos!
tried all of them, nothing worked, however, copying the video link into IE worked perfectly fine, so I guess it is something with mozilla and chrome

[Ari]

Please do as follows:
Clear internet browser's history and cookies.
Update: Windows/Mac, Browser, Java, Adobe flash player and Adobe shockwave player.
Restart computer if it still does not work means you need video codecs.
The best and free one is K-Lite. Just note when you install K-Lite codecs during installation put check marks where you need and install. Restart computer and you should watch videos without any problem. Some time we need to update Audio/video codecs and computer drivers specially Video graphic card's driver. Better update them if you can.

[Melbo]

Yeah. They are video-audios like video songs. People who wanna share the sounds on youtube usually convert the recorded audio to a video format without screen via a tool like aneesoft or other video converter. So, some of them just play sound but no video. You can also do it for fun.

[inukjuak90]

Your ''Cache'' (Temp Internet Files), "Virtual Memory'' and/or "PageFiling'' may be full
and cannot take anymore.  Simply delete your Cache (plus "Cookies" and "History"),
then clear your Memory with a shutdown & reboot.  Afterwards, you will freak at how
good and trouble-free YouTube will be.  Also, if you have an 'Adblock', try disabling it.

Mozilla Firefox:
→  Tools  →  Options  →  Privacy ('key')  →  Clear Now
[x] Browsing History
[x] Cache
[x] Cookies
[x] Offline Website Data
[x] Authenticated Sessions
→  Clear Private Data Now

Google Chrome:
→  ≡  or wrench  → Tools  →  Clear browsing data
→  the beginning of time ▼
[x] Clear browsing history
[x] Empty the cache
[x] Delete cookies and other site and plug-in data
→  Clear browsing data

Internet Explorer 9 and 10:
→  Gear (icon)  →  Safety  →  Delete browsing history
[x] Temporary Internet files and website files
[x] Cookies and website data
[x] History
→  Delete

Internet Explorer 11:
→  Settings ('gear' icon on the far right side)  →  Options
(then under History)  →  "Select"
[x] Cached images
[x] Cookies
[x] Browsing History
→  Delete

Don't forget to completely shutdown & reboot afterwards.

:-)