Failed to create h264 codec context

Hello, is this a problem of freerdp or a more generic one? Thanks.

$ flatpak run com.freerdp.FreeRDP --version
X11 /app/bin/xfreerdp
This is FreeRDP version 3.0.0-dev (763f7ae)

$ flatpak run com.freerdp.FreeRDP /size:1200x800 /smart-sizing:3000x2000 /u:user /v:remote
X11 /app/bin/xfreerdp
[13:31:01:183] [4:5] [INFO][com.freerdp.core] - freerdp_connect:freerdp_set_last_error_ex resetting error state
[13:31:01:183] [4:5] [INFO][com.freerdp.client.common.cmdline] - loading channelEx rdpdr
[13:31:01:183] [4:5] [INFO][com.freerdp.client.common.cmdline] - loading channelEx rdpsnd
[13:31:01:183] [4:5] [INFO][com.freerdp.client.common.cmdline] - loading channelEx cliprdr
[13:31:01:496] [4:5] [INFO][com.freerdp.primitives] - primitives autodetect, using optimized
[13:31:01:503] [4:5] [ERROR][com.freerdp.codec] - Failed to initialize libav parser
[13:31:01:504] [4:5] [ERROR][com.freerdp.core.codecs] - Failed to create h264 codec context