Awaiting feedback Can't view videos on firefox

[InsanePath]

Affected version

135.0.1

Hi I can't upload or view certain videos on Firefox 135.0.1. I can upload and view on other browsers fine but I see this with firefox.

It says no video with supported format and MIME found.

 

[zappaDPJ]

I'm using the same version of Firefox (64 bit) and not seeing any issues. It might be worth clearing your cache and cookies for any site that's giving the error.

 

[Kirby]

Firefox has no built-in support for H.265/HEVC software decoding due to royalties.

1332136 - H.265/HEVC Streaming not working

RESOLVED (nobody) in Core - Audio/Video. Last updated 2024-11-27.

bugzilla.mozilla.org

It therefore needs external / hardware support for decoding and at least version 134 (Windows) or 137 (Linux) to have this enabled by default.

Firefox 137 To Support HEVC/H.265 Video Playback On Linux With VA-API - Phoronix

www.phoronix.com

 

[Bionic Rooster]

Hi I can't upload or view certain videos on Firefox 135.0.1

I use Firefox 135.0.1 to upload and view videos on my site all the time without issues.

 

[zappaDPJ]

I use Firefox 135.0.1 to upload and view videos on my site all the time without issues.

If the issue the OP is having is related to HEVC then perhaps you and I have it supported via our graphics cards. I believe a lot of streaming services use HEVC and I've never experienced a problem with it while using Firefox.

 

[Kirby]

I believe a lot of streaming services use HEVC and I've never experienced a problem with it while using Firefox.

Hmm, I don't think so, streaming services prefer to use royalty-free codecs.

YouTube used mainly VP9 for a long time and AFAIK mainly uses AV1 by now.
Netflix also started to move to AV1 a couple years ago

@InsanePath
Check the codec used for the video, if it is indeed HEVC / H.265 check if your have hardware supports decoding that and if media.wmf.hevc.enabled is set to true in Firefox.

 

[zappaDPJ]

Hmm, I don't think so, streaming services prefer to use royalty-free codecs.

You could well be right, things change. I know Netflix was still using it a year or so ago because they were taken to court in Germany for patent infringement. I thought it was still a requirement for streaming their Ultra HD (4K) plan though. As far as I know Amazon Fire sticks are still using it.

I thought YouTube used VP9 more than AV1 but as I said, things change and it's hard to keep up with this stuff.

 

[XF Bug Bot]

Automated triage: Awaiting feedback

Thank you for reporting this issue. We found nothing Firefox-specific in how videos are shown. The message you quote comes from Firefox itself when it can't decode a video, which usually means a codec such as HEVC/H.265. We need a little more detail to look into this.

• What video codec do the failing files use (for example H.264, HEVC/H.265, AV1)? You can check with a tool such as MediaInfo or VLC's codec information.
• What is the file extension of a failing video (.mp4, .mov, etc.), and could you share one, or a link to a post where it fails?
• Do the same videos play in Firefox if you open the file directly, outside the forum? If it is HEVC, does enabling HEVC support in Firefox (media.wmf.hevc.enabled on Windows) or using a newer Firefox change anything?

This is an automated assessment. A member of staff may review and update it.