Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Live videos on Youtube, certain embedded videos on Reddit, and *all* videos on Nebula are failing to play

  • 6 uphendule
  • 4 zinale nkinga
  • 1 view
  • Igcine ukuphendulwa ngu Wiktoria

more options

I tried to watch a youtube livestream today and it failed to play. Non-live videos on youtube are playing, even the same videos watched as VODs after the stream ends, but the livestreams are providing "Your browser can't play this video" errors.

Simultaneously, I'm noticing that some videos on Reddit (such as embedded tiktok videos) are stuck with a circling ring and won't play. At least some of the same videos will play on Tiktok (when I can find them).

ALSO, when I try to watch videos on my Nebula subscription, I'm getting a "This video could not be loaded: 4" error code. ANY video on Nebula.

What the heck gives?!

I tried to watch a youtube livestream today and it failed to play. Non-live videos on youtube are playing, even the same videos watched as VODs after the stream ends, but the livestreams are providing "Your browser can't play this video" errors. Simultaneously, I'm noticing that some videos on Reddit (such as embedded tiktok videos) are stuck with a circling ring and won't play. At least some of the same videos will play on Tiktok (when I can find them). ALSO, when I try to watch videos on my Nebula subscription, I'm getting a "This video could not be loaded: 4" error code. ANY video on Nebula. What the heck gives?!

Isisombululo esikhethiwe

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile.

Funda le mpendulo ngokuhambisana nalesi sihloko 👍 2

All Replies (6)

more options

Install the Media Feature Pack if applicable.

Does it still happen in Troubleshoot Mode?

more options

"Media feature pack" isn't showing up as an option, but I do have "Windows Media Player Legacy" installed. Yes, the issue does occur in troubleshooting mode - at minimum, the Nebula and livestream issues.

Okulungisiwe ngu hobbitguy1420

more options

Isisombululo Esikhethiwe

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile.

more options

It does *not* happen in a new profile! Does that mean it may be an issue with one of the add-ons or extensions I have installed? Odd... I'd have expected Troubleshooting Mode to resolve the issue if that was the case.

Okulungisiwe ngu hobbitguy1420

more options

Okay, I refreshed my profile and that seems to have fixed it.

more options

I am having the same issue but launching Firefox in a safe mode or with a new profile does not fix it.

Also, Firefox throws a ton of the following error:

[Child 298, MediaDecoderStateMachine #1] WARNING: Decoder=7fae6d540400 Decode error: NS_ERROR_DOM_MEDIA_DECODE_ERR (0x806e0004) - virtual MediaResult mozilla::FFmpegVideoDecoder<59>::DoDecode(MediaRawData *, uint8_t *, int, bool *, MediaDataDecoder::DecodedData &): avcodec_send_packet error: Unknown error occurred: file /builds/worker/checkouts/gecko/dom/media/MediaDecoderStateMachineBase.cpp:166