Raspberry Pi display

Testing

Scope

The aim of the testing is to determine a viable combination of HW accelerations and/or display to be able to fluidly decode H.264 stream on Raspberry Pi. Also current state of UltraGrid is evaluated.

Tested SW:

• UltraGrid
• FFMPEG (ffplay)
• mpv
• (mplayer?)
• omxplayer

Setup

• Raspberry Pi 3 Model B
• Raspbian Buster with desktop
• 128 MB video RAM (gpu_mem=128)
• G3 GL (Full KMS) OpenGL desktop driver with full KMS (dtoverlay=vc4-kms-v3d)

Results

File playback (1080p50 H.264)

• omxplayer - smooth
• ffplay -vcodec h264_mmal - didn't play
• ffplay -vcodec h264_v4l2m2m - works but no rendering
• mpv --hwdec=v4l2m2m - around 12 FPS
• mpv --hwdec=mmal - ditto

Note: HW acceleration work with G3 GL, not G1 (G2 not tested)!

UltraGrid (as for110th Sep 2019)

• uv -d gl --param force-lavd-decoder=h264_v4l2m2m - crashes
• uv -d gl --param force-lavd-decoder=h264_mmal - something like 8 FPS
• uv -d sdl --param force-lavd-decoder=h264_mmal - 7 FPS
• uv -d sdl:renderer={1,2} --param force-lavd-decoder=h264_mmal (GLES renderers) - 9 FPS
• other drivers than X11 (RPI or wayland) didn't work

References

• Related Issue
• Device-Settings#Raspberry_Pi