Openh264 video encoding

[Jozsef Vass]

Hello,

We recently noticed a lower frame rate in our screen share. We think it may be related to Open H.264 software encode. When I select HEVC, video encoding uses hardware acceleration (in my case Video Toolbox). This seems to be the same in Windows as well (Media Foundation hardware accelerated encoding). 

Why isn't hardware acceleration used for H.264? Please see the following screenshots, You can see much lower fps for Open H.264.

Thank you.

Jozsef

Open H.264:

HEVC:

[Sean DuBois]

What H264 profiles are in the SetRemoteDescription?

It’s been a while, but I remember Broadcast Box didn’t have HW Acceleration because I didn’t have that right. If you do Chrome to Chrome do you get accelerated H264? 

Actually I only was only doing decoding though.

On Mar 27, 2026, at 19:25, 'Jozsef Vass' via discuss-webrtc <discuss...@googlegroups.com> wrote:



<h264.png>

HEVC:

<hevc.png>

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[Philipp Hancke]

CBP (42e01f) is using a software encoder for historical reasons and as a fallback in case there are driver issues like

  https://bugs.chromium.org/p/chromium/issues/detail?id=1295815

If you negotiate a different profile that should go away.

60ms per-frame encode time does look worrying though.