On Mon, Jul 29, 2024 at 12:32 PM Fritz Koenig <frkoenig@xxxxxxxxxxxx> wrote:
>
>
> v2:
> - cover letter
> - testing methodology
> - Signed-off-by
>
> V4L2 has support for hierarchical P frames using the
> V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING* controls. This allows for
> specifing P frame references needed for temporal scalability. Encoding a
> single stream with a single layer allows for the layer to be dropped and
> the stream to be decoded without artifacts.
>
> ChromeOS is planning to use this feature for the L1T2 web standard[1].
> This allows video conferencing apps to encode once for a clients with
> different performance/bandwidth capabilities.
>
> The ChromeOS test framework ("tast") was used to verify that no
> regressions are present. This was done on SC7180 ("trogdor").
>
> Verification of the added controls was done with a bitstream analyser to
> make sure that reference frame management is correct.
>
> [1]: https://www.w3.org/TR/webrtc-svc/#L1T2*
>
I still have plans to use git send-email correctly. Hopefully by the
next patch series.
Sorry for the missing subject, another email has been sent with the
correct subject.
I didn't realize that this had gone through.
