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Major A/V sync problem on Youtube

anniemasters
anniemasters
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Hi. I'm experiencing a severe lag between Audio & Video on Youtube (video lags audio by more than a second)

This ONLY happens on YT, ONLY on one PC (we have 3) and ONLY using Firefox. I've been through as much of YT as I can find, but nothing changes.

Running FF in safe mode eliminates the problem. I've checked all addons/extensions etc in normal mode, but none are enabled & can't find anything else which makes any difference.

Using Chrome/Edge/IE Explorer all are fine, using a different streaming service (UK TV Play/BBC iPlayer etc), all work fine with FF.

As a last resort, I deleted FF and all associated files, folders, registry entries and caches. Upon re-installing FF the problem returns.

I've tried running without antivirus protection, in case a firewall or somthing was messing with it, bit to no avail.

I'm totally flummoxed, so if anyone can shed some light, it'd be much appreciated. I really don't want to change to another browser as FF has served us well for years.............. but....y'know.

Thanks. Annie

Hi. I'm experiencing a severe lag between Audio & Video on Youtube (video lags audio by more than a second) This ONLY happens on YT, ONLY on one PC (we have 3) and ONLY using Firefox. I've been through as much of YT as I can find, but nothing changes. Running FF in safe mode eliminates the problem. I've checked all addons/extensions etc in normal mode, but none are enabled & can't find anything else which makes any difference. Using Chrome/Edge/IE Explorer all are fine, using a different streaming service (UK TV Play/BBC iPlayer etc), all work fine with FF. As a last resort, I deleted FF and all associated files, folders, registry entries and caches. Upon re-installing FF the problem returns. I've tried running without antivirus protection, in case a firewall or somthing was messing with it, bit to no avail. I'm totally flummoxed, so if anyone can shed some light, it'd be much appreciated. I really don't want to change to another browser as FF has served us well for years.............. but....y'know. Thanks. Annie

Modified by cor-el

Chosen solution

You can try to disable hardware acceleration in Firefox.

Close and restart Firefox after modifying the setting to apply changes.

You can check if there is an update for your graphics display driver and check for hardware acceleration related issues.

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All Replies (3)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
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Chosen Solution

You can try to disable hardware acceleration in Firefox.

Close and restart Firefox after modifying the setting to apply changes.

You can check if there is an update for your graphics display driver and check for hardware acceleration related issues.

zeroknight
zeroknight
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anniemasters said
Running FF in safe mode eliminates the problem.

You can disable hardware acceleration just for video by going to about:config and changing media.hardware-video-decoding.enabled to false then restarting the browser.

anniemasters
anniemasters Question owner
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Thank you for the replies.

Hardware acceleration was the issue. I did try that before, but in thinking back, I don't think I restarted Firefox, so just switched it back on.... Idiot!!

All seems ok now.

thanks again.

A.

Modified by anniemasters