[Solved] embedded videos in firefox take a lot of CPU time

Playing embeded videos in Firefox take a lot of CPU time. Actually my old computer is not able to play these videos correctly if they are in HD. The problem appears with flash videos (not so surprising, flash sucks...) but also with html5 videos (there is an option in youtube to turn that on). However if I succeed to have the direct URL, these videos play perfecrtlky fine in mplayer using not more than 10-20% of CPU time. Is there a solution to that? Is there any possibility to use an external player to play HTML5 videos in firefox? If anybody knows, Why this problem, are the mozilla folk aware of this problem? (Note that I posted a thread a long time ago for this problem but concerning flash only)
Last edited by olive (2012-04-27 20:33:59)

There's not much you can do to make HTML5 videos as fast as Xv, see http://swfdec.freedesktop.org/wiki/FAQ. They are slow for the same basic reason as Flash... the video overlay cannot be used because the standard allows for controls and CSS to be rendered on top of the video.
As for redirecting to an external player... this is not as easy as it could be. If the videos appeared in <embed> tags or <object> tags, one could use Mozplugger, Media Player Connectivity and other programs, but I don't think one has been written to handle the <video> tag. An upcoming update to firefox will make it use gstreamer, however. If this still results in slow playback, it will at least make it easier to use an external player. I imagine you would have to patch firefox to make it use a port on the localhost as the video sink instead of the screen. Then you would run gst-launch to receive that RTP stream.

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Since a couple of months I have this little annoying problem with firefox:
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Last edited by saronno (2014-09-13 13:46:22)

stevenhoneyman wrote:
edit: there's a "-v" parameter for strace that should show the unabbreviated stuff
When it happens, run: lsof -p <pid>
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A few questions to try narrow it down if that is a dead end:
Same behaviour if you close it and reopen... or just for the 1st time?
Compiled/linked with "-z now"?
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15:13:23.717180 ioctl(7, FIONREAD, [48]) = 0
15:13:23.717231 recvfrom(7, "\24\214\201\203\0\1\0\0\0\0\0\0\5kanon\7homenet\rtelec"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.1.1")}, [16]) = 48
15:13:23.717292 close(7) = 0
15:13:23.717318 socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 7
15:13:23.717350 connect(7, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.1.1")}, 16) = 0
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15:13:23.717438 sendto(7, "n\343\1\0\0\1\0\0\0\0\0\0\5kanon\0\0\1\0\1", 23, MSG_NOSIGNAL, NULL, 0) = 23
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15:13:28.722665 poll([{fd=7, events=POLLOUT}], 1, 0) = 1 ([{fd=7, revents=POLLOUT}])
15:13:28.722813 sendto(7, "n\343\1\0\0\1\0\0\0\0\0\0\5kanon\0\0\1\0\1", 23, MSG_NOSIGNAL, NULL, 0) = 23
15:13:28.722885 poll([{fd=7, events=POLLIN}], 1, 5000) = 1 ([{fd=7, revents=POLLIN}])
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15:13:28.743750 close(7) = 0
Anyway, if I understand correctly, It waits for something to read (POLLIN event) ...
fd=7 should be a socket ... a connection to the port 53 of my router ... probably a DNS request, right?
I use an HDD on this machine.
A curious thing is that thunderbird have the same problem.
Last edited by saronno (2014-09-13 13:28:57)

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Youtube Embedded Videos freeze Firefox

Hi everyone,
I noticed that on firefox when I go to pages that embeds YT videos my browser freeze and I have to forcely quit it.
With Standard GNOME3 web browser this doesn't happen. Can someone give an hint?
3.12.7-2-ARCH (64bit)
Firefox 26.0
flashplugin 11.2.202.332-1
Thanks to all of you in advance.

Thank you Wyodor, I also believe the solution may be simple, if it helps (and for all you coding experts out there) these are the three video/codes being used. For each code I had to add after " http: and before
//www.youtube to load videos to iWeb using html widget.
Video One code
This video on published website - plays using both Safari and Firefox.
<iframe width="1000" height="563" src="http://www.youtube.com/embed/rrMsYI6XVSw?rel=0" frameborder="0" allowfullscreen></iframe>
Video Two code
This video on published website - plays using Firefox but will NOT play using Safari.
<object width="1000" height="563"><param name="movie" value="http://www.youtube-nocookie.com/v/MDfE087Hgvw&hl=en_US&fs=1&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube-nocookie.com/v/MDfE087Hgvw&hl=en_US&fs=1&rel=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="1000" height="563"></embed></object>
Video Three code
This video on published website - plays using Firefox but will NOT play using Safari.
<object width="1000" height="563"><param name="movie" value="http://www.youtube-nocookie.com/v/X5n6M66jgUo&hl=en_US&fs=1&rel=0&color1=0xe1600 f&color2=0xfebd01&border=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube-nocookie.com/v/X5n6M66jgUo&hl=en_US&fs=1&rel=0&color1=0xe1600 f&color2=0xfebd01&border=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="1000" height="563"></embed></object>
If anybody knows the solution to this problem I will be pleased to hear from them. I am not a coding expert!

Since the last update (version 12), Firefox takes a lot of time to open new tabs, usually it open them, but i can't see the tabs and browse through them

it also ignore my mouse clicks on tabs.
i can browse them only by ctrl+Tab (but i see only the first tab on the tab bar...)

hello, in order to further diagnose the issue please [[Troubleshoot Firefox issues using Safe Mode|run firefox in safemode once]] & see if the problem is occuring there too. if not it may be related to one of your addons or hardware acceleration. in this case try disabling all extensions in tools > addons > extension, restart firefox and reenable the extensions one-by-one (restarts of the browser might be necessary after each time) until you find the one that's causing it. you can disable hardware acceleration in tools > options > advanced > general.
if the two suggestions from above don't help, please also have a look at your security-software & make sure it's not blocking/sandboxing the updated version of firefox or the plugin-container...

[Solved] embedded videos in firefox take a lot of CPU time

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