Embedded Youtube player only plays audio in Firefox - google-chrome

Issue
The embedded Youtube flash player only plays audio and displays a black box where the video should be in Firefox.
Site: Nexus Gaming Media
To see the issue try playing the video that appears when the above home page is loaded (in Firefox). The audio works fine but there's a black box where the video should be.
Despite the above issue other embedded videos work fine for me in Firefox. Such as the embedded video here: https://developers.google.com/youtube/youtube_player_demo
Tested flash player versions: 11.6.602.180 and 11.7.700.141 (11.7 beta)
What I've tried:
Re-installing the flash player
Using the beta flash player
Deleting all of the flash player cache files
Multiple profiles in Firefox
Modifying CSS values
Using a private browsing window in Firefox
Starting Firefox in safe mode with the default theme and all add-ons disabled
I cleared the history and cache after each modification and then I restarted the browser. The video playback works fine for me in Google Chrome (note that I have pepflashplayer disabled). Does anyone have any idea what's causing the embedded player to work in Chrome but not in Firefox?

Have you tried setting the wmode as a query string? (i.e. '?wmode=transparent')

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Only one video is playing simultaneously on Safari (Mac)

I used Simple Peer(WebRTC), ReactJS for my video call service. In the video call screen, I used 2 video tags(contact video and user video) for video playback. When the call gets started after a successful connection, only the contact video is getting played(1st video tag) and when the contact turns off their video user video is getting played(2nd video tag).
This only happens on Safari(I only tested on Mac). It works fine in other browsers(Google Chrome, Firefox).
Is there a way to fix this issue?
WebRTC depends a lot on browsers and Safari has specific requirements (like strict order of tracks). Check JS console to identify any errors.
You can experiment with a turnkey html5 videocall solution that works and try to replicate.

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I have a simple page with this HTML code :
<iframe src="http://www.facebook.com/video/embed?video_id=395974580579165"
width="1280" height="720" frameborder="0">
</iframe>
It is working fine in chrome but not in safari. I only have the preview with safari, but I cannot play the video.
However, a youtube embedded video in an iframe work both on chrome and safari
Any idea ? What is the correct way to embed a facebook video ?
Safari version : 8.0.2 (10600.2.5)
This type of Facebook embedded video requires flash player, which is not installed by default with Safari.
The problem is that Safari fails silently and doesn't even ask the user to install the plug-in. So I had no clue...
The embedded link for facebook looks something like this:
https://m.facebook.com/video/your-video.php?v=12345
Have a look at this post:
Facebook embeded video with iframe not working
It gives you more insight. Hope this helps
Bring up the Adobe Flash Settings page with this link http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager.html then starting at Global Privacy Settings, compare a working browser (e.g. Chrome) to the non working one (Safari in my case).
In my case, I had locked down Flash too much in Safari (restricting e.g. storage space allowed in the browser) to the extent that Facebook videos just appeared as a black space with no error message. Just wouldn't play back.
But adjusting the settings to those of the working Chrome Flash plugin re-enabled Flash video (Safari / Mac OSX) for me.

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I want to embed an mp4 in my Rails 4 app.
=video_tag "movie.mp4", controls: true
This works in Safari. However, in Chrome, the play button is grayed out. In Firefox, which I never use and may not have the requisite plugin installed, it says "Video format or MIME type is not supported" in the video player box.
The video is about 100mb and was created with iMovie.
Shouldn't mp4s play in the latest Chrome and FF? Is this a problem with the way I created the mp4 in iMovie?
Edit: added image of network console:
Edit 2: If I navigate to /assets/movie.mp4, the movie still doesn't play, and this is what I get in the network console:

Html5 mp4 video freezes IE

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No other browser is affected.
Have tried transcoding video in Handbrake to make sure it's using H.264 codec, but still no luck.
All other videos on site work fine in IE.
Has anyone got any suggestions that I can try?
Ps. Sorry, but can't share the video file as it's confidential to the client.
Oops - found out it was not IE but Avast (anti virus) add on that was freezing video.
Disabled Avast and video played as normal.
Still don't know why it only affected one video.

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I have a .mov file embedded in a web page, using nested object and embed tags.
It displays fine in Firefox & Chrome, but just displays a Quicktime icon with a question mark over it in IE6-8.
Before it displays the icon, it runs the quicktime activex control and flashes the beginning of the movie up.
Any ideas on what could be the issue? I've tested that I have Quicktime and the Quicktime browser plugin correctly installed, and I can view other quicktime movies inside of IE8.
I suspect that it is the movie itself, but it still plays fine in Firefox and Chrome.
If I go to the file directly in IE, it runs correctly.
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Or else you can use it
JW Video an File Streamer Server
It appears that the Quicktime plugin is just tetchy sometimes, so I ended up converting the file to Flash and posting it that way.