[Libav-user] Raspberry pi 4 encoding h264_v4l2m2m (Weylus): no picture and warnings

Dan Egnor egnor at ofb.net
Sat Feb 26 21:09:51 EET 2022


On Sat, Feb 26, 2022, 7:38 AM Alexander Kamm <akamm at web.de> wrote:

> Together with the developer of weylus I'm trying to get the hardware
> encoding with h264_v4l2m2m working. Actually the video stream can't be
> decoded on the client side and I have some warnings and error in the log
> file on the raspberry pi (see below).

I haven't done encoding so can't directly advise but for rpi accelerated
codecs I'd suggest working from the rpi working branch here:


(The Pi OS packages you're using are derived from that I think so you're
probably not far off already.)

I've found the developer on that effort super helpful, they have some demo
programs (on the decoding side at least) and can probably inform you about
what is expected to work at this point.

The raspberry pi forum on "graphics development" is also a good resource, a
number of us there work with video encoding/decoding:


Again since all my work so far is decoding side I don't have a direct
answer but I'm curious what you learn.

-- egnor

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