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HEVC video decoding broken with B-frames

aliofwind
Brass Contributor

‎Jan 19 2021 06:24 PM - edited ‎Jan 19 2021 06:25 PM

‎Jan 19 2021 06:24 PM - edited ‎Jan 19 2021 06:25 PM

HEVC video decoding broken with B-frames

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?

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84 Replies
HotCakeX

‎Jan 19 2021 10:59 PM

‎Jan 19 2021 10:59 PM

Re: HEVC video decoding broken with B-frames

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
1 Like
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GrandDynamo

‎Jan 23 2021 12:18 PM

‎Jan 23 2021 12:18 PM

Re: HEVC video decoding broken with B-frames

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). 

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Wittycat

‎Jan 23 2021 12:33 PM

‎Jan 23 2021 12:33 PM

Re: HEVC video decoding broken with B-frames

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)
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HotCakeX

‎Jan 24 2021 03:45 AM

‎Jan 24 2021 03:45 AM

Re: HEVC video decoding broken with B-frames

There are example videos online, a quick web search would reveal them
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GrandDynamo

‎Jan 24 2021 04:14 AM

‎Jan 24 2021 04:14 AM

Re: HEVC video decoding broken with B-frames

I encoded a video in the HEVC codec. I added the file to this message.

 

To test this, you can make a simple HTML file that plays this video in the Edge browser.

 

<body>
    <video src="PathToVideo\BigBuckBunny.mp4" type="video/mp4" controls></video>
</body>

 

Preview file
52975 KB
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HotCakeX

‎Jan 24 2021 04:54 AM

‎Jan 24 2021 04:54 AM

Re: HEVC video decoding broken with B-frames

I just drag and dropped this onto an Edge tab and i get extremely laggy playback
https://s3.amazonaws.com/x265.org/video/Tears_400_x265.mp4

700KB H.265 clip with HEVC extension installed on Windows (.MP4)
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GrandDynamo

‎Jan 24 2021 05:07 AM - edited ‎Jan 24 2021 05:08 AM

‎Jan 24 2021 05:07 AM - edited ‎Jan 24 2021 05:08 AM

Re: HEVC video decoding broken with B-frames

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. 

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HotCakeX

‎Jan 24 2021 05:14 AM

‎Jan 24 2021 05:14 AM

Re: HEVC video decoding broken with B-frames

Good info,
also since Edge supports both .mp4 and x265, why does my browser download the file instead of playing it right in the browser when I paste that link in the address bar?
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GrandDynamo

‎Jan 24 2021 05:25 AM - edited ‎Jan 24 2021 05:26 AM

‎Jan 24 2021 05:25 AM - edited ‎Jan 24 2021 05:26 AM

Re: HEVC video decoding broken with B-frames

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.

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HotCakeX

‎Jan 24 2021 05:46 AM

‎Jan 24 2021 05:46 AM

Re: HEVC video decoding broken with B-frames

Thanks that was useful!
what's the correct value of content-disposition in order to be played in the browser?
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HotCakeX

‎Jan 24 2021 11:49 AM

‎Jan 24 2021 11:49 AM

Re: HEVC video decoding broken with B-frames

Thank you 🙂
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Wittycat

‎Jan 24 2021 12:06 PM

‎Jan 24 2021 12:06 PM

Re: HEVC video decoding broken with B-frames

i confirm this problem as well (and b-frames=0 too).
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‎Jan 25 2021 09:58 AM

‎Jan 25 2021 09:58 AM

Re: HEVC video decoding broken with B-frames

https://x265.com/hevc-video-files/,

Just to add this example and I do see this issue on Edge stable and have sent feedback.
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HotCakeX

‎Jan 25 2021 10:49 AM

‎Jan 25 2021 10:49 AM

Re: HEVC video decoding broken with B-frames

Yeah affects all channels, not a single channel is exempt from this problem which is bad..
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HotCakeX

‎Jan 25 2021 10:50 AM

‎Jan 25 2021 10:50 AM

Re: HEVC video decoding broken with B-frames

I've read that Edge uses software decoding instead of hardware for HEVC so it all comes to the way the software is implemented
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GrandDynamo

‎Jan 25 2021 10:53 AM - edited ‎Jan 25 2021 10:58 AM

‎Jan 25 2021 10:53 AM - edited ‎Jan 25 2021 10:58 AM

Re: HEVC video decoding broken with B-frames

Hmm I always thought that Edge offloads the decoding to the Operating System as I have read that Microsoft does not want to pay for the licensing of HEVC (complicated patent pools). I don't know a lot of Edge and the inner workings of it as I mainly use Edge for HEVC playback (intended to use) so that's interesting to hear.

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HotCakeX

‎Jan 25 2021 12:02 PM

‎Jan 25 2021 12:02 PM

Re: HEVC video decoding broken with B-frames

Hmm, but I remember paying .99$ for the HEVC extension in the store. so maybe MSFT doesn't want to pay but we are paying xD
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Wittycat

‎Jan 25 2021 12:02 PM

‎Jan 25 2021 12:02 PM

Re: HEVC video decoding broken with B-frames

i have an automated reponse from the report feature who tell me they check what they can do for this problem.
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