Hi,

I´m using OpenH264 as H264 decoder for FreeRDP. (See FreeRDP/FreeRDP#6051)
If I am using a version > 1.8.0 the decoded stream is distorted.

Build instructions:

1. Test on ubuntu 20.04
2. Prepare using apt build-dep freerdp2-x11
3. OpenH264 (meson build), mesion setup -Dprefix=/tmp/openh264-test -Dtests=disabled testbuild && ninja -C testbuild install
4. FreeRDP cmake -DWITH_FFMPEG=OFF -DWITH_OPENH264=ON -DCMAKE_INSTALL_PREFIX=/tmp/openh264-test . && cmake --build . --target install

Run instructions:
/tmp/openh264-test/bin/xfreerdp /v:<Windows 10 RDP server IP/URL> /u:<user> /p:<password> /network:auto /gfx:avc444 /dynamic-resolution

Already at the login screen the frame data is sometimes lacking areas (black/green rectangles)
I´ve already tried using DecodeFrameNoDelay as suggested in #3079 without success.

Not exactly sure what is causing this, so maybe it is just some setting required for newer decoder versions lacking

Note:

• It works correctly if using FFMPEG (-DWITH_FFMPEG=ON, using x264 on ubuntu) or openH264 1.8.0 builds

Screenshot with OpenH264 2.1.1:

Screenshot with OpenH264 1.8.0 (only library changed, same xfreerdp binary)

Screenshot with FFMPEG: