When Edge Chromium playing HEVC video, sometimes video will be similar to stuttering but audio is normal. To find out the cause of the problem, I test to playback many HEVC video, include videos with and without B-frames. Finally found that only the video with B-frames had problems. Play HEVC video with B-frames frame by frame, after decoding and outputting a B-frame, the next frame will return to the referenced I-frame or P-frame. It is puzzling that in Edge Legacy, HEVC video with B-frames plays normally. So what happened in Edge Chromium?

I just drag and dropped this onto an Edge tab and i get extremely laggy playbackhttps://s3.amazonaws.com/x265.org/video/Tears_400_x265.mp4700KB H.265 clip with HEVC extension installed on Windows (.MP4)

We're continuing to push the owning team to fix bugs on this, but to be clear, the bugs are being fixed by the team that owns that HEVC extension, and so it's the release of a new version of that extension that you're waiting on.

I can also reproduce it with your sample.I can also confirm with certainty on my end that it has to do with the HEVC b-frames because when I encode a video with "b-frames=0" it plays fine without any stutter.

The reason it starts to download the file instead of playing it in the browser, is because the response header "Content-Disposition:" has the value "attachment". The browser sees that and it starts to download it.Another interesting thing I found, is that for some reason when I click on my BigBunny video on this page it starts playing the video without issues.Edit: I think the reason it plays fine here is because of shakaplayer. But I am not sure on that one.

the value is "inline" https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition : )

HEVC video decoding broken with B-frames

HotCakeX
MVP
Jan 20, 2021
That's correct, I experience the same thing on all Edge channels, I thought it was related to the HEVC extension available in Windows store but the same video plays fine in movies & TV app or Windows media player
GrandDynamo
Brass Contributor
Jan 23, 2021
I have the same issue om my machine. Even when using the Edge Chromium Dev build Version 89.0.767.0 (Official build) dev (64-bit).
- Wittycat
  Steel Contributor
  Jan 23, 2021
  does you have the link of a video who do that (for reproducing purpose, if you report it by the browser don't forget this)
  - HotCakeX
    MVP
    Jan 24, 2021
    There are example videos online, a quick web search would reveal them
jesseinsf
Brass Contributor
Jun 08, 2021
I don't think it's HEVC, I think it is PlayReady DRM. Both Netflix and HBO Max use PlayReady DRM, and Widevine DRM when PlayReady isn't available.

For me, this issue has been happening since the first release of the Nvidia 30 series drivers. Now it only happens for the first ten seconds with each Mouse hover preview on Netflix and some HBO Max content. At the time of my Video, HBO Max didn't use HEVC. Anyway, it only lasts about 10 seconds on both Netflix and HBO Max. And yes, this only seems to happen with 4K displays. It affects each version of HDCP differently. My older 4K monitor had HDCP 2.0 and my new monitor has HDCP 2.2.
https://www.youtube.com/watch?v=flTsBxdNu6g&t=4s

Note: HBO Max kept Jittering for 10 seconds with HEVC uninstalled. I had to disable PlayReady DRM for the jitters to go away. For netflix, it only happens with 4k and ATMOS content (Excluding most Anime). BTW, disabling Playready (or uninstalling HEVC) is not an option because doing so will not allow the viewing of any Netflix 4K/ATOMOS content.
- aliofwind
  Brass Contributor
  Jun 08, 2021
  jesseinsfThis problem happened when I played the local HEVC codec mp4 video, I don’t think it is related to PlayReady DRM
  - abdelfattah
    Iron Contributor
    Jun 11, 2021
    No issues whatsoever here with 1080p HEVC Main10 (x265, bframes=12), or a 2160p HDR HEVC Main10 file in Movies & TV.
    
    The same 1080p file is a weird stuttery mess if I remux it to MP4 and drag and drop it on Edge Dev.
    
    HEVC Extensions from Device Manufacturer 1.0.41023.0 with an AMD GPU on 21H1.
AmineI
Brass Contributor
Oct 27, 2021
Hi josh_bodner !
Do you have any insights, plans, or updates you could share about HEVC support on Windows ? The fact that it seems to work with older versions of the Windows Store HEVC extension, as found in the last few comments, is quite curious.
- josh_bodner
  Microsoft
  Nov 04, 2021
  AmineI I passed it onto our video team, and they thought it was quite weird too, since at least on the Edge side, we didn't make any changes to this in the time since it stopped working, so apparently the bug was always there, and the new version of the extension just happened to start triggering it!
  - Angel Alegre Garcia
    Copper Contributor
    Dec 16, 2021
    josh_bodner any updates on this?
CharlesBurns
Copper Contributor
Nov 12, 2021
This issue is causing video playback problems in Emby (A media system similar to Plex, written in C#):
See:
https://emby.media/community/index.php?/topic/102877-question-about-browser-support-for-hevc/#comment-1082825

The first post has a very useful attachment showing a *recording* of playback with the issue.
LegendT
Copper Contributor
Feb 26, 2022
Can confirm it works now on Edge beta v99 + HEVC extension 1.0.50631. Just wait a few more days for the Stable release v99.

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HEVC video decoding broken with B-frames

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